Transactions With Affiliates And Affiliated Entity [Abstract] Transactions With Affiliates And Affiliated Entity [Abstract] Schedule of amounts Incurred under management agreement Schedule of Related Party Transactions [Table Text Block] Receivables [Abstract] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Domain] Class of Financing Receivable, Type [Domain] Subprime Portfolio I Subprime Portfolio I [Member] Company's holdings in Subprime Mortgage Loans Portfolio I. Subprime Portfolio II Subprime Portfolio II [Member] Company's holdings in Subprime Mortgage Loans Portfolio II. Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Total securitized loans (unpaid principal balance) Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement Loans subject to call option (carrying value) Subprime mortgage loans subject to call option Reflects the aggregate carrying amount of subprime mortgage loans subject to call option. Retained bonds (fair value) Retained Interest, Fair Value Disclosure Average loan seasoning Average loan seasoning Average term of loan seasoning for items within Subprime Portfolios I and II. Weighted average yield of retained bonds Weighted Average Yield of Retained Bonds Weighted average yield rate of retained bonds within Subprime portfolios. Statement of Financial Position [Abstract] Assets Assets [Abstract] Real estate securities, available-for-sale Available-for-sale Securities, Debt Securities Real estate securities, available-for-sale - pledged as collateral Pledged Assets Separately Reported, Mortgage-Related Securities Available-for-sale or Held-for-investment Real estate related and other loans, held-for-sale, net Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Commercial, Real Estate Subprime mortgage loans subject to call option Investments in real estate, net of accumulated depreciation Investments in real estate, net of accumulated depreciation Amount of real estate investment property, net of accumulated depreciation related to investments in real estate. Intangibles, net of accumulated amortization Intangible Assets, Net (Excluding Goodwill) Other investments Equity Method Investments Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Restricted cash Restricted Cash and Cash Equivalents Receivables from brokers, dealers and clearing organizations Receivables from Brokers-Dealers and Clearing Organizations Receivables and other assets Other Assets Total Assets Assets Liabilities and Equity Liabilities and Equity [Abstract] Liabilities Liabilities [Abstract] CDO bonds payable Secured Debt Other bonds and notes payable Other Long-term Debt Repurchase agreements Securities Sold under Agreements to Repurchase Credit facilities and obligations under capital leases Debt and Capital Lease Obligations Financing of subprime mortgage loans subject to call option Financing of subprime mortgage loans subject to call option Reflects the aggregate carrying amount of financing of subprime mortgage loans subject to call option. Junior subordinated notes payable Junior Subordinated Notes Dividends payable Dividends Payable Membership deposit liabilities Customer Advances and Deposits Payables to brokers, dealers and clearing organizations Payables to Broker-Dealers and Clearing Organizations Accounts payable, accrued expenses and other liabilities Accounts Payable and Other Accrued Liabilities Total Liabilities Liabilities Commitments and contingencies Commitments and Contingencies Equity Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.01 par value, 100,000,000 shares authorized, 1,347,321 shares of 9.75% Series B Cumulative Redeemable Preferred Stock, 496,000 shares of 8.05% Series C Cumulative Redeemable Preferred Stock, and 620,000 shares of 8.375% Series D Cumulative Redeemable Preferred Stock, liquidation preference $25.00 per share, issued and outstanding as of September 30, 2016 and December 31, 2015 Preferred Stock, Value, Issued Common stock, $0.01 par value, 1,000,000,000 shares authorized, 66,734,136 and 66,654,598 shares issued and outstanding at September 30, 2016 and December 31, 2015, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Accumulated deficit Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Total Newcastle Stockholders’ Equity Stockholders' Equity Attributable to Parent Noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest Total Equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total Liabilities and Equity Liabilities and Equity TRANSACTIONS WITH AFFILIATES AND AFFILIATED ENTITIES Related Party Transactions Disclosure [Text Block] Fair Value Disclosures [Abstract] Corporate Loans Bank Loan Obligations [Member] Total Real Estate Related and other Loans Held-for-Sale, Net Total Real Estate Related and Other Loans Held-for-Sale, Net [Member] The company's total real estate related and other loans held for sale. Mezzanine Loans Mezzanine Loans [Member] The company's mezzanine real estate related loans holdings. Range [Axis] Range [Axis] Range [Domain] Range [Domain] Lower Range Minimum [Member] Upper Range Maximum [Member] Weighted Average Weighted Average [Member] Carrying Value Loans and Leases Receivable, Net Amount Fair Value Loans Receivable, Fair Value Disclosure Discount Rate Fair Value Inputs, Discount Rate Loss Severity Fair Value Inputs, Loss Severity Face amount Mortgage Loans on Real Estate, Face Amount of Mortgages Gains Losses On Settlement Of Investments Net And Other Income Loss Net Schedule of gains (losses) on settlement of investments, net and other income (loss), net Gain (Loss) on Investments [Table Text Block] Investments, Debt and Equity Securities [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] CMBS CMBS [Member] Company-identified securities holdings type of commercial mortgage backed conduit securities holdings. ABS - Non-Agency RMBS Residential Mortgage Backed Securities [Member] ABS - Small Business Loans ABS-Franchise [Member] Securities that are primarily serviced by the cash flows of a discrete pool of receivables or other financial assets for example, but not limited to, credit card receivables, car loans, recreational vehicle loans, and mobile home loans for franchise vehicles. Debt securities Debt Securities [Member] Equity Securities Equity Securities [Member] FNMA/FHLMC US Government Agencies Debt Securities [Member] Non-consolidated CDO Securities Non-consolidated CDO Securities [Member] Non-consolidated securities collateralized by a pool of assets. Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Real Estate Securities Available For Sale Real Estate Securities Available For Sale [Member] The amount of real estate securities available for sale, as depicted on the company's schedule of carrying value and fair value. Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Total Securities, Pledged as Collateral Securities Pledged as Collateral [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Other Other [Member] Company-identified operating segment. This refers to other holdings within the other debt segment. Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Unlevered real estate securities Unlevered Real Estate Securities [Member] Specific investment and debt holdings related to unlevered real estate securities. Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Outstanding Face Amount Investment Owned, Balance, Principal Amount Before Impairment - Amortized Cost Basis Before Impairment - Amortized Cost Basis Amortized Cost basis of real estate securities before any impairment charges. Other-Than-Temporary Impairment - Amortized Cost Basis Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held After Impairment - Amortized Cost Basis Available-for-sale Debt Securities, Amortized Cost Basis Gross Unrealized Gains Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Carrying Value Number of Securities (in contracts/securities) Investment Owned, Balance, Contracts Weighted Average Rating Debt Instrument, Credit Rating Weighted Average Coupon Weighted Average Coupon Weighted average of all coupon rates for each asset type. Weighted Average Yield Weighted Average Yield Weighted average of all yield rates for each asset type. Weighted Average Life Weighted Average Life (Years) Weighted average of the remaining years to maturity for each asset type. Weighted Average Principal Subordination Weighted Average Principal Subordination Weighted average of all principal subordination rates for all securities holdings in each asset type. Total outstanding face amount of fixed rate securities Total outstanding face amount of fixed rate securities Total outstanding face amount of all the company's holdings of fixed rate securities. Total outstanding face amount of floating rate securities Total outstanding face amount of floating rate securities Total outstanding face amount of all the company's holdings of floating rate securities. Excluded from face amount of unlevered real estate securities Excluded from face amount of unlevered real estate securities Face amount of unlevered real estate securities excluded from presentation. Stockholders' Equity Note [Abstract] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Series B Cumulative Redeemable Preferred Stock Series B Preferred Stock [Member] Series C Cumulative Redeemable Preferred Stock Series C Preferred Stock [Member] Series D Cumulative Redemable Preferred Series D Preferred Stock [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Title of Individual [Axis] Title of Individual [Axis] Relationship to Entity [Domain] Relationship to Entity [Domain] Issued to the independent directors Director [Member] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Employee Stock Option Employee Stock Option [Member] Class of Stock [Line Items] Class of Stock [Line Items] Dividends declared per share of common stock (in dollars per share) Common Stock, Dividends, Per Share, Declared Dividends declared per share of preferred stock (in dollars per share) Preferred Stock, Dividends Per Share, Declared Preferred stock, dividend rate Preferred Stock, Dividend Rate, Percentage Dividends paid Payments of Ordinary Dividends Preferred dividends in arrears Preferred Stock, Amount of Preferred Dividends in Arrears Preferred dividends in arrears (in dollars per share) Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears Shares issued to independent directors (in shares) Stock Issued During Period, Shares, Issued for Services Potentially dilutive securities (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Dilutive common stock equivalents (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Dilutive stock options, due to loss position (in shares) Incremental Common Shares Attributable to Share-based Payment Arrangements, Excluded Due to Loss Position Incremental Common Shares Attributable to Share-based Payment Arrangements, Excluded Due to Loss Position Schedule of carrying value and estimated fair value of assets and liabilities Fair Value, by Balance Sheet Grouping [Table Text Block] Schedule of assets and liabilities measured at fair value on a recurring basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of change in fair value of Level 3 investments Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Schedule of fair value for real estate related and other loans held-for-sale Schedule Of Fair Value For Real Estate Related And Other Loans Held-For-Sale [Table Text Block] Fair value measurements for real estate related loans and other loans held for sale. Supplemental Non-cash Investing And Financing Activities Related To Cdos SUPPLEMENTAL NON CASH INVESTING AND FINANCING ACTIVITIES RELATED TO CDOs Cash Flow, Supplemental Disclosures [Text Block] Subsequent Events [Abstract] SUBSEQUENT EVENTS Subsequent Events [Text Block] Year of Maturity Year of Maturity Outstanding Face Amount Outstanding Face Amount Delinquent Mortgage Loans on Real Estate, Principal Amount of Delinquent Loans Period from October 1, 2016 to December 31, 2016 Remainder of Fiscal Year Remainder of Fiscal Year 2017 Year Two Face amount of loans receivable that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. 2018 Year Three Face amount of loans receivable that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. 2019 Year Four Face amount of loans receivable that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. 2020 Year Five Face amount of loans receivable that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. 2021 LoansReceivableMaturitiesRepaymentsOfPrincipalInYearSixFace nct_LoansReceivableMaturitiesRepaymentsOfPrincipalInYearSixFace Thereafter Thereafter Face amount of loans receivable that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Total Carrying Value Carrying Value Delinquent MortgageLoansOnRealEstateCarryingValueOfDelinquentLoans Carrying value of principal due on loans that have been delinquent, which may exclude loans having interest delinquent for three months or less, as of the balance sheet date. Period from October 1, 2016 to December 31, 2016 LoansReceivableMaturitiesRepaymentsOfPrincipalInRemainderofFiscalYear Carrying value of loans receivable that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. 2017 LoansReceivableMaturitiesRepaymentsOfPrincipalInYearTwo Carrying value of loans receivable that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. 2018 LoansReceivableMaturitiesRepaymentsOfPrincipalInYearThree Carrying value of loans receivable that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. 2019 LoansReceivableMaturitiesRepaymentsOfPrincipalInYearFour Carrying value of loans receivable that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. 2020 LoansReceivableMaturitiesRepaymentsOfPrincipalInYearFive Carrying value of loans receivable that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. 2021 Loans Receivable Maturities Repayments Of Principal In Year Six Loans Receivable Maturities Repayments Of Principal In Year Six Thereafter LoansReceivableMaturitiesRepaymentsOfPrincipalThereafter Carrying value of loans receivable that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Total Number of Loans Number of Loans Delinquent (in loans) MortgageLoansOnRealEstateNumberOfLoansDelinquent The number of loans that have been delinquent, as of the balance sheet date. Period from October 1, 2016 to December 31, 2016 (in loans) MortgageLoansOnRealEstateNumberOfLoansMaturingRemainderofFiscalYear The number of loans receivable that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. 2017 (in loans) MortgageLoansOnRealEstateNumberOfLoansMaturingInYearTwo The number of loans receivable that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. 2018 (in loans) MortgageLoansOnRealEstateNumberOfLoansMaturingInYearThree The number of loans receivable that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. 2019 (in loans) MortgageLoansOnRealEstateNumberOfLoansMaturingInYearFour The number of loans receivable that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. 2020 (in loans) MortgageLoansOnRealEstateNumberOfLoansMaturingInYearFive The number of loans receivable that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. 2021 (in loans) Mortgage Loans On Real Estate Number Of Loans Maturing In Year Six Mortgage Loans On Real Estate Number Of Loans Maturing In Year Six Thereafter (in loans) MortgageLoansOnRealEstateNumberOfLoansMaturingThereafter The number of loans receivable that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Total (in loans) Loan Count Indicates the number of mortgages under each classification. Income Statement [Abstract] Interest income Interest and Dividend Income, Operating Interest expense Interest Expense Net interest income Interest Income (Expense), Net Impairment (Reversal) Impairment/(Reversal) The amount of impairment charges, or the reversal thereof, in the period relating to loans and other securities. Valuation allowance on loans Provision for Loan, Lease, and Other Losses Other-than-temporary impairment on securities and other investments Other than Temporary Impairment Losses, Investments, Available-for-sale Securities Portion of other-than-temporary impairment on securities recognized in other comprehensive income (loss), net of the reversal of other comprehensive loss into net income (loss) Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities Total impairment ImpairmentNetOfTheReversalOfPriorValuationAllowancesOnLoans The amount of impairment charge, net of the reversal of prior valuation allowances on loans. Net interest income after impairment Interest Income (Expense), after Provision for Loan Loss Operating Revenues Operating Income (Loss) [Abstract] Golf course operations Revenue, Net Sales of food and beverages - golf Food and Beverage Revenue Other golf revenue Other Revenue, Net Total operating revenues Other Operating Income Other Income (Loss) Noninterest Income [Abstract] Gain (loss) on settlement of investments, net Gain (Loss) on Investments Gain (loss) on extinguishment of debt, net Gain (Loss) on Extinguishment of Debt Gain on deconsolidation Deconsolidation, Gain (Loss), Amount Other income, net Other Nonoperating Gains (Losses) Total other income Nonoperating Gains (Losses) Expenses Operating Expenses [Abstract] Loan and security servicing expense Loan Portfolio Expense Operating expenses - golf Operating expenses - golf Golf operating expenses incurred during the period. Cost of sales - golf Cost of Goods and Services Sold General and administrative expense General and Administrative Expense Management fee to affiliate Management fee to affiliate Fees paid to affiliate which advises the Company on various aspects of its business and manages its day-to-day operations pursuant to a management agreement. Depreciation and amortization Depreciation, Depletion and Amortization Total expenses Operating Expenses Income from continuing operations before income tax Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income tax expense (benefit) Income Tax Expense (Benefit) Income from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Income from discontinued operations, net of tax Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Net Income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Preferred dividends Preferred Stock Dividends, Income Statement Impact Net (income) loss attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Income Applicable to Common Stockholders Net Income (Loss) Available to Common Stockholders, Basic Income Applicable to Common Stock, per share Income Applicable to Common Stock, per share Heading for income/loss per share of common stock. Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Income from continuing operations per share of common stock, after preferred dividends and noncontrolling interests Income from Continuing Operations per share of Common Stock, after preferred dividends and noncontrolling interests Basic (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Diluted (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Income from discontinued operations per share of common stock Income (Loss) from Discontinued Operations per share of Common Stock Basic (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Diluted (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Weighted Average Number of Shares of Common Stock Outstanding Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Dividends Declared per Share of Common Stock (in dollars per share) Payables and Accruals [Abstract] ACCOUNTS PAYABLE, ACCRUED EXPENSES AND OTHER LIABILITIES Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] CMBS Commercial Mortgage Backed Securities [Member] ABS (A) Asset-backed Securities [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Western U.S. Western US [Member] The geographic distribution of collateral to securities holdings located in the Western United States. Northeastern U.S. Northeastern US [Member] The geographic distribution of collateral to securities holdings located in the Northeastern United States. Southeastern U.S. Southeastern US [Member] The geographic distribution of collateral to securities holdings located in the Southeastern United States. Midwestern U.S. Midwestern US [Member] The geographic distribution of collateral to securities holdings located in the Midwestern United States. Southwestern U.S. Southwestern US [Member] The geographic distribution of collateral to securities holdings located in the Southwestern United States. Outstanding Face Amount Percentage Investment Owned, Percent of Net Assets Receivables And Other Assets [Abstract] Receivables And Other Assets [Abstract] RECEIVABLES AND OTHER ASSETS Other Assets Disclosure [Text Block] Accounting Policies [Abstract] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Buildings and improvements Building Improvements [Member] Furniture, fixtures and equipment Furniture and Fixtures [Member] Capital leases - equipment Assets Held under Capital Leases [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Estimated useful lives Property, Plant and Equipment, Useful Life Debt Disclosure [Abstract] Future minimum lease payments due Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] October 1, 2016 - December 31, 2016 Capital Leases, Future Minimum Payments, Remainder of Fiscal Year 2017 Capital Leases, Future Minimum Payments Due in Two Years 2018 Capital Leases, Future Minimum Payments Due in Three Years 2019 Capital Leases, Future Minimum Payments Due in Four Years 2020 Capital Leases, Future Minimum Payments Due in Five Years 2021 Capital Leases, Future Minimum Payments Due in Year Six Capital Leases, Future Minimum Payments Due in Year Six Thereafter Capital Leases, Future Minimum Payments Due Thereafter Total minimum lease payments Capital Leases, Future Minimum Payments Due Less: imputed interest Capital Leases, Future Minimum Payments, Interest Included in Payments Present value of net minimum lease payments Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments Other than Temporary Impairment Losses, Investments [Abstract] Schedule of Investments [Table] Schedule of Investments [Table] Equity securities Other investments Other Investments [Member] Schedule of Investments [Line Items] Schedule of Investments [Line Items] Other-than-temporary impairment on securities Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Deferred Deferred [Member] Information pertaining to net deferred hedge (gains) and losses. Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Designated as hedging instrument Designated as Hedging Instrument [Member] Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative assets Derivative Asset Derivative liabilities Derivative Liability Expected reclassification of current hedges from AOCI into earnings over the next 12 months (less than in 2015) Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months Statement [Table] Statement [Table] Statement [Line Items] Statement [Line Items] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Preferred stock liquidation preference, (in dollars per share) Preferred Stock, Liquidation Preference Per Share Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Organization, Consolidation and Presentation of Financial Statements [Abstract] REIT distribution threshold for nontaxation REIT distribution threshold for nontaxation The threshold rate of income to be distributed by the company to stockholders by prescribed dates, that will generally allow the company to not be subject to US federal corporate income taxes. Other requirements also must be met. EQUITY AND EARNINGS PER SHARE Stockholders' Equity Note Disclosure [Text Block] Real Estate Related and Other Loans Real Estate Related and Other Loans Real Estate Related and Other Loans Held For Sale [Member] Real Estate Related Loans Held for Sale. Residential Mortgage Loans Total Residential Mortgage Loans [Member] Information pertaining to total residential mortgage loans. Foreign Foreign [Member] The geographic distribution of collateral to securities holdings located in foreign locations. Other Other Locations [Member] The geographic distribution of collateral to securities holdings located in other locations. Outstanding Face Amount Percentage Percentage of loans Percentage of outstanding loans presented per geographic location. Subsequent Event [Table] Subsequent Event [Table] FNMA/FHLMC 2 FNMA/FHLMC 2 [Member] FNMA/FHLMC 2 [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Investment owned Investment Owned, Face Amount Average price percentage - purchases Average price percentage - purchases The average price at which securities were purchased, depicted as a percentage of the original purchase price. Proceeds from transaction Proceeds from Sale of Available-for-sale Securities Proceeds from securities purchased under agreements to resell Proceeds from Securities Purchased under Agreements to Resell Face amount of securities sold Face amount of securities sold The stated principal amount of debt securities sold during the period. Average price percentage - sold Average price percentage - sold The average price at which securities were sold, depicted as a percentage of the original purchase price. Repayments of repurchase agreements Proceeds from (Payments for) in Securities Sold under Agreements to Repurchase Accounts receivable, net Accounts Receivable, Net Prepaid expenses Prepaid Expense Interest receivable Interest Receivable Deposits Deposit Assets Inventory Inventory, Net Residential mortgage loans, held-for-sale, net Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage Miscellaneous assets, net Other Assets, Miscellaneous Total Receivables and Other Assets Schedule of useful lives of property, plant, and equipment Schedule of useful lives of property, plant, and equipment Tabular disclosure of useful lives of property, plant and equipment. Schedule of certain assets and liabilities of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Statement of Comprehensive Income [Abstract] Net income Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Net unrealized gain on available-for-sale securities Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Reclassification of net realized gain on securities into earnings Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Reclassification of net realized gain on deconsolidation of CDO VI Other Comprehensive Income (Loss), Reclassification Adjustment from Deconsolidation, Net of Tax Other Comprehensive Income (Loss), Reclassification Adjustment from Deconsolidation, Net of Tax Net unrealized loss on derivatives designated as cash flow hedges Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Reclassification of net realized (gain) loss on derivatives designated as cash flow hedges into earnings Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax Other comprehensive loss Other Comprehensive Income (Loss), Net of Tax Total comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive income (loss) attributable to Newcastle stockholders’ equity Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income (loss) attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Numerator for basic and diluted earnings per share: Numerator for basis and diluted earnings per share: Income from continuing operations after preferred dividends and noncontrolling interests Income from continuing operations after preferred dividends and noncontrolling interests Net income (loss) from continuing operations after adjustments for dividends on preferred stock and noncontrolling interests. Income from discontinued operations, net of tax Denominator: Denominator: Denominator for basic earnings per share - weighted average shares (in shares) Effect of dilutive securities Effect of dilutive securities Options (in shares) Denominator for diluted earnings per share - adjusted weighted average shares (in shares) Basic earnings per share: Earnings Per Share [Abstract] Income from continuing operations per share of common stock, after preferred dividends and noncontrolling interests (in dollars per share) Income from discontinued operations per share of common stock (in dollars per share) Income Applicable to Common Stock, per share (in dollars per share) Diluted earnings per share: Earnings Per Share, Diluted [Abstract] Income from continuing operations per share of common stock, after preferred dividends and noncontrolling interests (in dollars per share) Income from discontinued operations per share of common stock (in dollars per share) Income Applicable to Common Stock, per share (in dollars per share) DERIVATIVES Derivative Instruments and Hedging Activities Disclosure [Text Block] Number of Options Number of Options Number of Options [Roll Forward] Number of Options [Roll Forward] Number of Options [Roll Forward] Balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Balance (in shares) Exercisable (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted Average Strike Price Weighted Average Strike Price Weighted Average Strike Price [Roll Forward] Weighted Average Strike Price [Roll Forward] Weighted Average Strike Price [Roll Forward] Outstanding (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Outstanding (in dollars per share) Exercisable (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted Average Life Remaining Weighted Average Life Remaining Outstanding, Weighted Average Life Remaining Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Exercisable, Weighted Average Life Remaining Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Schedule of debt obligations and related hedges Schedule of Debt [Table Text Block] Schedule of future minimum lease payments under capital leases Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Carrying Value Reported Value Measurement [Member] Estimated Fair Value Estimate of Fair Value Measurement [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Measured on a Recurring Basis Fair Value, Measurements, Recurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Level 2 Market Quotations (Observable) Fair Value, Inputs, Level 2 [Member] Level 3 Market Quotations (Unobservable) Fair Value, Inputs, Level 3 [Member] Valuation Technique [Axis] Valuation Technique [Axis] Valuation Technique [Domain] Valuation Technique [Domain] Market Quotations (Unobservable) Market Approach Valuation Technique [Member] Internal Pricing Models Internal Pricing Models [Member] Internal Pricing Models [Member] Not designated as hedging instrument Not Designated as Hedging Instrument [Member] Interest rate cap Interest Rate Cap [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Derivative assets: Real estate securities, available-for-sale: Available-for-sale Securities Real estate securities, available-for-sale - pledged as collateral Non-hedge derivative assets Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value Derivative assets total Liabilities Derivative liabilities: Derivative Liability [Abstract] TBAs, not treated as hedges Other Derivatives Not Designated as Hedging Instruments Liabilities at Fair Value Derivative liabilities total Residential Mortgage Loans Residential Mortgage Loans Held For Sale [Member] Residential Mortgage Loans Held for Sale. Held-for-Sale Loans and Leases Receivable [Roll Forward] Loans and Leases Receivable [Roll Forward] Balance at December 31, 2015 Purchases / additional fundings Mortgage Loans on Real Estate, New Mortgage Loans Interest accrued to principal balance Mortgage Loans on Real Estate, Other Additions Principal paydowns Mortgage Loans on Real Estate, Collections of Principal Sales Mortgage Loans on Real Estate, Cost of Mortgages Sold Valuation allowance on loans Accretion of loan discount, other amortization and other income Mortgage Loans on Real Estate, Amortization of Premium Loss on settlement of loans Mortgage Loans on Real Estate, Loss on Settlement on Loans Mortgage Loans on Real Estate, Loss on Settlement on Loans Balance at September 30, 2016 Held-For-Sale Allowance for Loan and Lease Losses [Roll Forward] Balance at December 31, 2015 Loans and Leases Receivable, Allowance Charge-offs Allowance for Loan and Lease Losses, Write-offs Balance at September 30, 2016 Reclassification From Accumulated Other Comprehensive Income Into Net Income Schedule of reclassification from accumulated other comprehensive income into net income Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] FNMA/FHLMC 3 FNMA/FHLMC 3 [Member] FNMA/FHLMC 3 [Member] FNMA/FHLMC 4 FNMA/FHLMC 4 [Member] FNMA/FHLMC 4 [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Golf First Lien Loan Golf First Lien Loan [Member] Information pertaining to debt related to Golf First Lien Loan. Mezzanine note payable Mezzanine Note Payable [Member] Mezzanine Note Payable [Member] Golf Term Loans Golf [Member] Golf [Member] Capital Leases (Equipment) Capital Lease Obligations [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] London Interbank Offered Rate (LIBOR) London Interbank Offered Rate (LIBOR) [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Variable interest rate spread Debt Instrument, Basis Spread on Variable Rate Gain on extinguishment of debt, net Available-for-sale Securities, Gross Realized Gain (Loss) Repayments of debt Repayments of Debt Number of golf properties financed (in properties) Number of Real Estate Properties Outstanding face amount Debt Instrument, Face Amount Minimum effective interest rate Debt Instrument, Interest Rate, Effective Percentage Variable rate Debt Instrument, Variable Rate Debt Instrument, Variable Rate Debt instrument, term Debt Instrument, Term Number of renewals (in renewals) Debt Instruments, Number Of Renewals Debt Instruments, Number Of Renewals Renewal period Debt Instruments, Renewal Period Debt Instruments, Renewal Period Segment Reporting [Abstract] Schedule of segment reporting Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of other debt segment investments and debt Schedule of other debt segment investments and debt Schedule detailing segment information for other debt. REAL ESTATE RELATED AND OTHER LOANS, RESIDENTIAL MORTGAGE LOANS AND SUBPRIME MORTAGE LOANS Loans, Notes, Trade and Other Receivables Disclosure [Text Block] SEGMENT REPORTING Segment Reporting Disclosure [Text Block] Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities Deferred revenue Deferred Revenue Security deposit payable Security Deposit Liability Unfavorable leasehold interests Off-market Lease, Unfavorable Accrued rent Accrued Rent Due to affiliates Due to Affiliate Miscellaneous liabilities Other Accrued Liabilities Total Accounts Payable, Accrued Expenses and Other Liabilities Statement of Cash Flows [Abstract] Cash Flows From Operating Activities Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash used in operating activities (inclusive of amounts related to discontinued operations): Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization DepreciationDepletionAndAmortizationIncludingDiscontinuedOperations The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. Including aggregate expense from both continuing and discontinued operations. Amortization of discount and premium Accretion (Amortization) of Discounts and Premiums, Investments Other amortization Other Depreciation and Amortization Net interest income on investments accrued to principal balance InterestIncomeOnInvestmentsAccruedToPrincipalBalance Interest income on investments accrued to principal balance. As a noncash item, it is an adjustment to net income when calculating cash provided by or used in operations using the indirect method. Amortization of revenue on golf membership deposit liabilities Amortization of Revenue on Golf Membership Deposit Liabilities Amortization of Revenue on Golf Membership Deposit Liabilities Amortization of prepaid golf membership dues Amortization of Prepaid Golf Member Dues Amortization of Prepaid Golf Member Dues Non-cash directors’ compensation Non-cash directors' compensation Noncash compensation paid to directors' during the period. Valuation allowance on loans Other-than-temporary impairment on securities and other investments Equity in earnings from equity method investments, net of distributions IncomeLossFromEquityMethodInvestments1 This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. Gain on deconsolidation Gain on settlement of investments, net Gain (Loss) on Investments, Excluding Other than Temporary Impairments Unrealized loss on non-hedge derivatives Unrealized Gain (Loss) on Derivatives Loss (gain) on extinguishment of debt, net Change in: Increase (Decrease) in Operating Capital [Abstract] Restricted cash Increase (Decrease) in Restricted Cash for Operating Activities Receivables and other assets Increase (Decrease) in Accounts Receivable and Other Operating Assets Accounts payable, accrued expenses and other liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Cash Flows From Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Principal repayments from investments Principal repayments from investments The cash inflow associated with maturities (principal being due), repayments and calls (payments before maturities) of securities held for investment purposes. Purchase of real estate securities Payments to Acquire Available-for-sale Securities Proceeds from sale of investments Payments for settlement of TBAs Payments for (Proceeds from) Derivative Instrument, Investing Activities Acquisition and additions of investments in real estate Payments to Acquire Real Estate Change in restricted cash from investing activities Decrease in Restricted Cash Net cash (used in) provided by investing activities Net Cash Provided by (Used in) Investing Activities Cash Flows From Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Repurchases of debt obligations PaymentsForRepurchasesOfCdoBondsPayable The cash outflow for the payment for repurchases of CDO bonds payable. Borrowings under debt obligations Proceeds from Other Debt Repayments of debt obligations Repayments of Other Debt Margin deposits under repurchase agreements and derivatives Margin deposits under repurchase agreements and derivatives Increase decrease in the period of funds used for margin deposits under repurchase agreements and derivatives. Return of margin deposits under repurchase agreements and derivatives RepaymentsMarginDeposits The return of margin deposits under repurchase agreements and derivatives in the period. Golf membership deposits received Golf Membership Deposits Received Golf Membership Deposits Received Common stock dividends paid Payments of Ordinary Dividends, Common Stock Preferred stock dividends paid Payments of Ordinary Dividends, Preferred Stock and Preference Stock Payment of deferred financing costs Payments of Financing Costs Payments for settlement of derivative instruments Payments for (Proceeds from) Derivative Instrument, Financing Activities Other financing activities Proceeds from (Payments for) Other Financing Activities Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Net Increase (Decrease) in Cash and Cash Equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and Cash Equivalents of Continuing Operations, Beginning of Period Cash and Cash Equivalents of Discontinued Operations, Beginning of Period Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents Cash and Cash Equivalents, End of Period Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations Cash and Cash Equivalents of Continuing Operations, End of Period Supplemental Schedule of Non-Cash Investing and Financing Activities Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Preferred stock dividends declared but not paid Preferred stock dividends declared but not paid The aggregate amount of preferred dividends declared, but not paid, as of the financial reporting date. Common stock dividends declared but not paid Common stock dividends declared but not paid The aggregate amount of common dividends declared, but not paid, as of the financial reporting date. Financing costs accrued but not paid Debt Issuance Costs Incurred During Noncash or Partial Noncash Transaction Additions to capital lease assets and liabilities Capital Lease Obligations Incurred Option exercise Stock Issued Summary of amounts recorded in the statement of operations for OTTI Summary Of Amounts Recorded In The Statement Of Operations For OTTI [Table Text Block] Summarization of information determined to be disclosed concerning other than temporary impairments (OTTI) of investments reported in the statement of income. Management fees Management Fees The total management fees incurred in the period. Expense reimbursement to the Manager Expense Reimbursement to the Manager The total expense reimbursement paid to the manager during the period. Incentive compensation Incentive Compensation The total incentive compensation paid to the manager during the period. Total Management fee to affiliate ManagementFeesTotal The total management fees incurred in the period and due to the affiliate. Income Tax Disclosure [Abstract] INCOME TAXES Income Tax Disclosure [Text Block] Discontinued Operations and Disposal Groups [Abstract] DISCONTINUED OPERATIONS Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Subprime mortgage loans subject to call options Subprime Mortgage Loans subject to Call Options [Member] Financing arrangement that represents a contractual right to receive money either on demand or on fixed or determinable dates related to subprime residential financing. Subject to call options. Levered real estate securities Levered Real Estate Securities [Member] Specific investment and debt holdings related to real estate securities. Real estate related and other loans Real Estate Related and Other Loans [Member] Specific investment and debt holdings related to real estate securities. Non-Recourse Non-recourse [Member] Company-identified operating segment. This segment refers to holdings the company has in other non-recourse debt obligations, which are not available to satisfy obligations outside of financings. Other Debt Other Debt [Member] Company-identified operating segment. This segment refers to other debt obligations. Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Investments Outstanding Face Amount Investments Carrying Value Investments Debt Outstanding Face Amount Debt Carrying Value Debt Carrying Value Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. Prior to inter-segment elimination, as presented in segment reporting disclosures. Derivative [Table] Derivative [Table] Other Contract Other Contract [Member] Position [Axis] Position [Axis] Position [Domain] Position [Domain] Short Short [Member] Long Long [Member] Forward Contracts Forward Contracts [Member] NCT 2013-VI Class I-MM-2 NCT 2013-VI Class I-MM-2 [Member] NCT 2013-VI Class I-MM-2 [Member] Newcastle CDO VI CDO VI [Member] Debt obligations (bonds payable) to CDO VI. Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Available-for-sale Securities Available-for-sale Securities [Member] CDO Bonds Payable CDO Bonds Payable [Member] CDO Bonds Payable [Member] Other Bonds Payable Other Bonds Payable [Member] Other Bonds Payable [Member] Derivative [Line Items] Derivative [Line Items] Number of interest rate derivatives held (in derivative instruments) Number of Interest Rate Derivatives Held Interest rate derivative instruments not designated as hedging instruments at fair value, net Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net Derivative, number of instruments held (in contracts) Derivative, Number of Instruments Held Notional amount Derivative, Notional Amount Margin deposit assets Margin Deposit Assets Operating lease term Lessee Leasing Arrangements, Operating Leases, Term of Contract Refundable term for initiation fees Refundable term for initiation fees Initiation fees refundable term. Expected life of active golf membership Expected life of active golf membership The expected life of active golf membership. Ownership in equity investment Equity Method Investment, Ownership Percentage Acquisition of servicing rights Payments To Acquire CDO Servicing Rights The cash outflow to obtain servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. Rights may be obtained via (1) acquisition or assumption of a servicing obligation that does not relate to financial assets of the servicer or its consolidated affiliates; or (2) by originating mortgage loans and then (a) transferring the loans to a Variable Interest Entity (VIE) in a transaction that meets the necessary transfer and classification requirements, or (b) transferring the loans in a transaction that meets the requirements for sale accounting. Amortization of servicing rights Amortization of Mortgage Servicing Rights (MSRs) (MSR) impairment (recovery) Mortgage Servicing Rights (MSR) Impairment (Recovery) Servicing assets Servicing Asset Number of securities sold (in securities) Number of Securities Sold Number of Securities Sold Debt instrument, redemption price, percentage of principal amount redeemed Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed Carrying value of Newcastle's investment Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net Reclassification of net realized gain on deconsolidation of CDO VI FNMA/FHLMC Securities FNMA/FHLMC Securities Repurchase Agreements [Member] Debentures, notes, and other debt securities issued by US government agencies, for example, but not limited to, Government National Mortgage Association (GNMA or Ginnie Mae). Excludes US treasury securities and debt issued by government-sponsored Enterprises (GSEs), for example, but is not limited to, Federal Home Loan Mortgage Corporation (FHLMC or Freddie Mac), Federal National Mortgage Association (FNMA or Fannie Mae), and the Federal Home Loan Bank (FHLB). Repurchase Agreements Total Repurchase Agreements [Member] Information pertaining to total repurchase agreements. Vineyard II Golf Vineyard II [Member] Information pertaining to debt related to Golf Vineyard II financing facilities. Golf Credit Facilities Total Golf Credit Facilities [Member] Information pertaining to debt related to total Golf credit facilities. Junior subordinated notes payable Junior Subordinated Debt [Member] Corporate Corporate Debt Securities [Member] Subtotal debt obligations Debt Securities Payable [Member] Financing on subprime mortgage loans subject to call option Residential Portfolio Segment [Member] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Citi Citi [Member] Citi [Member] Jefferies Jefferies [Member] Jefferies [Member] Morgan Stanley Morgan Stanley [Member] Morgan Stanley [Member] Outstanding Face Amount Carrying Value Long-term Debt, Gross Weighted Average Coupon Debt, Weighted Average Interest Rate Weighted Average Funding Cost Weighted Average Funding Cost The weighted average funding cost of the instrument, including hedges. Depicted as a percentage of total debt proceeds. Weighted Average Life DebtWeightedAverageRemainingLife The weighted average remaining term of maturity of debt instruments, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Face Amount of Floating Rate Debt Face Amount of Floating Rate Debt The face amount of floating rate debt. Outstanding Face Amount of Collateral Outstanding Face Amount of Collateral The outstanding face amount of debt collateral. Amortized Cost Basis of Collateral Amortized Cost Basis of Collateral The total amortized cost of debt collateral. Carrying Value of Collateral Debt Instrument, Collateral Amount Weighted Average Maturity of Collateral Weighted Average Maturity (Years) Of Collateral The weighted average remaining term of maturity of collateral securing debt instruments, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Floating Rate Face Amount of Collateral Floating Rate Face Amount of Collateral The face amount of floating rate debt collateral. Accrued interest payable Interest Payable Margin exposure Margin exposure The amount of margin exposure the company is exposed to due to repurchase agreements. Number of golf properties collateralized (in properties) Deferred financing costs Debt Issuance Costs, Net CDOs CDOs [Member] Securities collateralized by a pool of loans. Golf Golf Information pertaining to the Golf business segment. Corporate Corporate Segment [Member] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments Operating Segments [Member] Eliminations Intersegment Eliminations [Member] Operating Activities [Axis] Operating Activities [Axis] Operating Activities [Domain] Operating Activities [Domain] Discontinued Operations Discontinued Operations [Member] Inter-segment elimination Inter-segment eliminations The amount intersegment eliminations relating to net interest income (expense), as depicted in segment reporting disclosures. Total impairment Total other income (loss), net Operating expenses - golf CostOfOtherPropertyOperatingExpenseGolf Other operating costs incurred during the reporting period for golf properties. Operating expenses - golf, repairs and maintenance expenses Cost of Property Repairs and Maintenance General and administrative expense GeneralAndAdministrativeExpense1 The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. Specific to general and administrative expense, as depicted in disclosures of segment reporting. General and administrative expense - acquisition and transaction expenses Acquisition and transaction expenses This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. Income tax expense Income from discontinued operations Net income attributable to noncontrolling interests Investments Cash and restricted cash Cash, Cash Equivalents, and Short-term Investments Other assets Other Assets, Noncurrent Debt, net Other liabilities Other Liabilities Preferred stock Equity attributable to common stockholders Equity attributable to common stockholders Net total of assets over liabilities, excluding preferred stock and the value of noncontrolling interests. Additions to investments in real estate during the nine months ended September 30, 2016 Additions to investments in real estate Additions to investments in real estate during the period. Document And Entity Information Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Real Estate [Abstract] Investment [Table] Investment [Table] Golf Investments Golf Investments [Member] Information pertaining to investments in golf facilities. Land Land [Member] Construction in progress Construction in Progress [Member] Investment [Line Items] Investment [Line Items] Gross Carrying Amount SEC Schedule III, Real Estate, Gross Accumulated Depreciation SEC Schedule III, Real Estate Accumulated Depreciation Net Carrying Value SEC Schedule III, Real Estate Investment Property, Net Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Golf Revenues Revenue Recognition, Policy [Policy Text Block] Derivatives and Hedging Activities Derivatives, Policy [Policy Text Block] Operating Leases and Operating Expenses Lease, Policy [Policy Text Block] Investments in Real Estate, Net Investments in Real Estate, Net Disclosure of accounting policy for investments in real estate. Intangibles Intangible Assets, Finite-Lived, Policy [Policy Text Block] Membership Deposit Liabilities Membership Deposit Liabilities [Policy Text Block] Membership Deposit Liabilities [Policy Text Block] Other Investment Equity Method Investments, Policy [Policy Text Block] Impairment of Real Estate and Finite-lived Intangible Assets Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block] Investment in CDO Servicing Rights Investment in CDO Servicing Rights Disclosure of accounting policy for investments in CDO servicing rights. Variable Interest Entities Consolidation, Variable Interest Entity, Policy [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Segment Reporting Segment Reporting, Policy [Policy Text Block] Fair Value Measurements Fair Value of Financial Instruments, Policy [Policy Text Block] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Commitments and Contingencies Commitments and Contingencies, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Subsequent Events Subsequent Events, Policy [Policy Text Block] Schedule of receivables and other assets Schedule of Other Assets [Table Text Block] Schedule of accounts payable, accrued expenses and other liabilities Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Net realized gain (loss) on securities Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Net realized gain (loss) on derivatives designated as cash flow hedges Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of accumulated other comprehensive income Reclassification out of Accumulated Other Comprehensive Income [Member] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] (Impairment) reversal, Portion of other-than-temporary impairment on securities recognized in other comprehensive income Gain on settlement of real estate securities, Gain (loss) on settlement of investments, net Realized Investment Gains Realized Investment Gains Gain on deconsolidation of CDO VI, Gain on deconsolidation Loss on settlement of real estate securities, Gain (loss) on settlement of investments, net Realized Investment Losses Realized Investment Losses Loss recognized on termination of derivative instruments, Gain (loss) on settlement of investments, net Amortization of deferred gain, Interest expense Investment Income, Interest Net income (loss) Net Income (Loss) Attributable to Parent Total reclassifications Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax DEBT OBLIGATIONS Debt Disclosure [Text Block] Schedule of investments in real estate related to its Golf business Schedule of Real Estate Properties [Table Text Block] OTHER-THAN-TEMPORARY IMPAIRMENT OTHER-THAN-TEMPORARY-IMPAIRMENT The disclosure of the amount of other than temporary impairment (OTTI) recognized in earnings. Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Assets of consolidated VIEs that can only be used to settle obligations of consolidated VIEs Assets of consolidated VIEs that can only be used to settle obligations of consolidated VIEs Marketable Securities Marketable Securities [Table Text Block] Schedule of activity related to credit losses on debt securities Schedule of activity related to credit losses on debt securities Schedule summarizing the activity related to credit losses on debt securities during the period. Schedule of geographic distribution of collateral securing Newcastle's CMBS and ABS Schedule of geographic distribution of collateral securing Newcastle's CMBS and ABS Schedule detailing the geographic distribution of collateral securing company's debt holdings. Assets Assets, Fair Value Disclosure [Abstract] Residential mortgage loans, held-for-sale, net Liabilities Liabilities, Fair Value Disclosure [Abstract] Non-hedge derivative liabilities Corporate Bank Loans Corporate Bank Loans [Member] Corporate Bank Loans [Member] Rental expense - carts and equipment Operating Leases, Rent Expense Number of securities (in securities) Loan Count (in loans) Gain on settlement of real estate securities Available-for-sale Securities, Gross Realized Gains Loss on settlement of real estate securities Available-for-sale Securities, Gross Realized Losses Gain (loss) on repayment/disposition of loans held-for-sale Gain (Loss) on Sales of Mortgage Loans Gain (Loss) on Sales of Mortgage Loans Loss recognized on termination of derivative instruments Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net Realized loss on settlement of TBAs Gain (Loss) On Settlement Of TBAs Amount of income (loss) recognized on the settlement of TBAs in the income statement. Gain (Loss) on Settlement of Investments, net Unrealized gain (loss) on non-hedge derivative instruments Gain (loss) on non-hedge derivative instruments Gains of losses recognized by the company on non-hedge derivative instruments and depicted in other income. Gain (loss) on lease modifications and terminations Gain (Loss) on lease modifications and terminations Gain (loss) related to the termination and/or modification of a lease between the parties. Collateral management fee income, net Management Fees Revenue Equity in earnings of equity method investees Equity (deficit) in earnings of equity method investees This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. Gain (loss) on disposal of long-lived assets Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Other income Other Nonoperating Income Other Income (Loss), net Goodwill and Intangible Assets Disclosure [Abstract] Schedule of intangible assets Schedule of Intangible Assets and Goodwill [Table Text Block] Deferred tax assets: Components of Deferred Tax Assets [Abstract] Allowance for loan losses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses Depreciation and amortization Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other Accrued expenses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Net operating losses Deferred Tax Assets, Operating Loss Carryforwards Total deferred tax assets Deferred Tax Assets, Gross Less valuation allowance Deferred Tax Assets, Valuation Allowance Net deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Deferred tax liabilities: Deferred Tax Liabilities, Gross [Abstract] Leaseholds Deferred Tax Liabilities, Property, Plant and Equipment Other Deferred Tax Liabilities, Other Total deferred tax liabilities Deferred Tax Liabilities, Gross Net deferred income tax assets Deferred Tax Assets, Net Liabilities of consolidated VIEs for which creditors or beneficial interest holders do not have recourse to the general credit of Newcastle Liabilities of consolidated VIEs for which creditors or beneficial interest holders do not have recourse to the general credit of Newcastle GAINS (LOSSES) ON SETTLEMENT OF INVESTMENTS, NET AND OTHER INCOME (LOSS), NET Cost and Equity Method Investments Disclosure [Text Block] Restricted cash generated from sale of securities Restricted cash generated from sale of securities The net cash inflow for the increase associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities. These funds are generated from the sale of securities. Restricted cash generated from sale of loans Restricted cash generated from sale of loans The net cash inflow for the increase associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities. These funds are generated from the sale of loans. Restricted cash generated from paydowns on securities and loans Restricted cash generated from paydowns on securities and loans The net cash inflow for the increase associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities. These funds are generated from the paydown of securities and loans. Restricted cash used for repayments of CDO and other bonds payable Restricted cash used for repayments of CDO bonds payable The net cash outflow for the decrease associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities. These funds were used for repayments of CDO bonds payable. Real estate securities Real Estate Securities Real Estate Securities Restricted cash Restricted Cash Restricted Cash CDO and other bonds payable CDO and Other Bonds Payable CDO and Other Bonds Payable Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Affiliated Entity Affiliated Entity [Member] CDO Collateralized Debt Obligations [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Lease term Lease term Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Management fee earned Management Fee Earned Management Fee Earned Manager advisory fee Manager Advisory Fee The percentage of the company's gross equity, inclusive of adjustments for return of capital dividends, which is due to the manager each fiscal year as fees for advisory and other services. Incentive compensation percentage Incentive compensation percentage The incentive compensation percentage to be paid to the Manager. Simple interest rate in incentive calculation Simple interest rate in incentive calculation Interest rate utilized in incentive compensation calculation. Shares held by fortress and affiliates in newcastle (in shares) Shares held by Fortress and affiliates in Newcastle Number of shares of the company's stock held by Fortress investments directly and through affiliates. Stock options outstanding (in shares) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options Servicing fee percentage Servicing fee percentage The servicing fee, on a percentage basis, on the unpaid principal balance of Subprime Portfolios. Number of Securities (in contracts) Investments in and advances to affiliates, at fair value, gross additions Investments in and Advances to Affiliates, at Fair Value, Gross Additions Expected yield Expected yield The expected yield of investments in CDOs made with affiliates. Proceeds from collection of notes receivable Proceeds from Collection of Notes Receivable Corporate loan investment Loan unpaid principal balance (“UPB”) Weighted average coupon rate of loans Delinquencies of 60 or more days (UPB) Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement Net credit losses for the nine months ended September 30, 2016 Net Credit Loss on Loans Managed or Securitized or Asset-backed Financing Arrangement Cumulative net credit losses SubprimeCumulativeNetCreditLosses Cumulative credit losses on subprime securitized mortgage loans. Cumulative net credit losses as a % of original UPB SubprimeNetCreditLossesPercentageOriginalUPB The percentage of cumulative credit losses to the original loan unpaid principal balance on subprime securitized mortgage loans. Percentage of ARM loans SubprimePercentageARMLoans Percentage of securitized subprime loans that are adjustable-rate mortgage loans (ARM loans). Percentage of loans with original loan-to-value ratio 90% SubprimePercentageLoansWithHighLoanValueRatio Percentage of securitized subprime loans with an original loan to value ratio greater than 90%.. Percentage of interest-only loans SubprimePercentageInterestOnlyLoans Percentage of securitized subprime loans that are interest-only loans. Face amount of debt Weighted average funding cost of debt SubprimeWeightedAverageFundingCostDebt Weighted average of all funding costs for all securitized subprime mortgage loans. Retained Notes excluded from face amount of debt in Subprime Portfolio I RetainedBondsFaceAmount2006SecuritizationTrust Face amount of retained bonds from Securitization trust 2006 for subprime loans. Excess collateralization Excess Collateralization Excess Collateralization Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Discontinued Operations, Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] Beavercreek, OH Planned Sale Beavercreek, OH Planned Sale [Member] Information pertaining to the planned sale of Beavercreek, OH properties and accounted for as discontinued operations as of the balance sheet date. Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Gain of sale of discontinued operations Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax Repayments of debt obligations Schedule of gains (losses) recorded in relation to derivatives Derivative Instruments, Gain (Loss) [Table Text Block] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] INTANGIBLES, NET OF ACCUMULATED AMORTIZATION Goodwill and Intangible Assets Disclosure [Text Block] Gain (loss) on settlement of investments, net Gain (loss) on sale of investments, net This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets) in investment income; the fair value of which assets was or is measured on a recurring basis using significant unobservable inputs (Level 3). OTTI Total Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings Corporate Loans Residential Mortgage Loans Held-for-Sale, Net Total Residential Mortgage Loans Held-For-Sale [Member] The company's total residential mortgage loans held for sale. Subprime Mortgage Loans Subject to Call Option Subprime Mortgage Loans Subject to Call [Member] Financing arrangement that represents a contractual right to receive money either on demand or on fixed or determinable dates related to subprime residential financing. Subject to call options. Valuation Allowance Weighted Average Coupon Mortgage Loans on Real Estate, Interest Rate Floating Rate Loans as % of Face Amount Floating Rate Loans as a % of Face Amount