Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Statement of Financial Position [Abstract] Mortgage servicing rights at fair value Servicing Asset at Fair Value, Amount Advances and other receivables, Reserves Advances and Other Receivables, Reserves Advances and Other Receivables, Reserves Reverse mortgage interests, Reserves Reverse Funded Loan Advances, Reserves Reverse Funded Loan Advances, Reserves Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares issued Preferred Stock, Shares Issued Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Treasury Shares Treasury Stock, Shares Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Other Assets Other Assets Disclosure [Text Block] Reverse Mortgage Interests [Abstract] Reverse Mortgage Interests [Abstract] Reverse Mortgage Interest Reverse Mortgage Interest [Table Text Block] Reverse Mortgage Interest [Table Text Block] Statement of Cash Flows [Abstract] Operating Activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net income (loss) attributable to Nationstar Net Income (Loss) Attributable to Parent Adjustments to reconcile net income (loss) to net cash attributable to operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Net income attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest Net gain on mortgage loans held for sale Gain (Loss) on Sales of Loans, Net Reverse mortgage loan interest income Interest Income, Reverse Mortgages Interest Income, Reverse Mortgages Gain on sale of assets Gain (Loss) on Disposition of Assets Provision for servicing reserves Provision for Reserves on Advance and Other Receivables Provision for Reserves on Advance and Other Receivables Fair value changes and amortization/accretion of mortgage servicing rights/liabilities Mortgage Servicing Rights (MSR) Impairment (Recovery) Fair value changes in excess spread financing Fair Value Changes in Excess Financing Spread Fair value changes in excess spread financing Fair value changes in mortgage servicing rights financing liability Fair Value Changes in MSR Financing Liability Fair Value Changes in mortgage servicing rights financing liability Amortization of premiums, net of discount accretion Accretion (Amortization) of Discounts and Premiums, Investments Depreciation and amortization for property and equipment and intangible assets Depreciation, Depletion and Amortization Share-based compensation Share-based Compensation Other loss Operating Activities, Other Income (Loss) Operating Activities, Other Income (Loss) Repurchases of forward loan assets out of Ginnie Mae securitizations Repurchase of Forward Loan Assets out of Ginnie Mae Securitizations Repurchase of Forward Loan Assets out of Ginnie Mae Securitizations Mortgage loans originated and purchased for sale, net of fees Payments for Origination and Purchases of Loans Held-for-sale Sales proceeds and loan payment proceeds for mortgage loans held for sale and held for investment Proceeds From Sale And Other Changes In Mortgage Loan Held For Sale Proceeds from sale and other changes in mortgage loan held for sale. Excess tax deficiency from share-based compensation Excess Tax Benefit (Deficiency) from Share-based Compensation, Operating Activities Excess Tax Benefit (Deficiency) from Share-based Compensation, Operating Activities Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Advances and other receivables Increase (Decrease) in Accounts Receivable Reverse mortgage interests Increase Decrease in Reverse Funded Advances Due to Securitization Reverse funded advances due to securitization Other assets Increase (Decrease) in Other Operating Assets Payables and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Net cash attributable to operating activities Net Cash Provided by (Used in) Operating Activities Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Property and equipment additions, net of disposals Payments for (Proceeds from) Productive Assets Purchase of forward mortgage servicing rights, net of liabilities incurred Payments (Proceeds) To Acquire Mortgage Servicing Rights (MSR) Payments (Proceeds) To Acquire Mortgage Servicing Rights (MSR) Net payment related to acquisition of HECM related receivables Proceeds (Payments) From Acquisition Of Reverse Mortgage Interests And Home Equity Conversion Mortgage Related Receivables Proceeds (Payments) From Acquisition Of Reverse Mortgage Interests And Home Equity Conversion Mortgage Related Receivables Proceeds on sale of forward and reverse mortgage servicing rights Proceeds (Repayments) From Sale Of Mortgage Servicing Rights (MSR) Proceeds (Repayments) From Sale Of Mortgage Servicing Rights (MSR) Proceeds on sale of assets Proceeds from Sale of Productive Assets Net cash attributable to investing activities Net Cash Provided by (Used in) Investing Activities Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] (Decrease) increase in warehouse facilities Proceeds from (Repayments of) Secured Debt Decrease in advance facilities Proceeds from (Repayments of) Lines of Credit Proceeds from issuance of HECM securitizations Proceeds from Other Debt Repayment of HECM securitizations Repayments of Other Debt Proceeds from issuance of participating interest financing in reverse mortgage interests Proceeds From Issuance Of Participating Interest Financing In Reverse Mortgage Interests, Net Proceeds From Issuance Of Participating Interest Financing In Reverse Mortgage Interests, Net Repayment of participating interest financing in reverse mortgage interests Proceeds from (Payments for) Mortgage Backed Securities Notes Payable Proceeds from (Payments for) Mortgage Backed Securities Notes Payable Issuance of excess spread financing Proceeds from Excess Spread Financing Proceeds from Excess Spread Financing Repayment of excess spread financing Repayment of Excess Servicing Spread Financing Repayment of excess servicing spread financing Repayment of nonrecourse debt – legacy assets Repayment of Nonrecourse Debt Legacy Assets Repayment of nonrecourse debt - Legacy assets Repurchase of unsecured senior notes Payment for Repurchase of Unsecured Debt Payment for Repurchase of Unsecured Debt Surrender of shares relating to stock vesting Payments Related to Tax Withholding for Share-based Compensation Debt financing costs Payments of Financing Costs Dividends to non-controlling interests Payments of Ordinary Dividends, Noncontrolling Interest Net cash attributable to financing activities Net Cash Provided by (Used in) Financing Activities Net decrease in cash, cash equivalents, and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Cash, cash equivalents, and restricted cash - beginning of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents, and restricted cash - end of period Supplemental Disclosures of Cash Activities Supplemental Cash Flow Elements [Abstract] Cash paid for interest expense Interest Paid, Including Capitalized Interest, Operating and Investing Activities Net cash paid for income taxes Income Taxes Paid, Net Mortgage Loans Held for Sale and Investment [Abstract] Mortgage Loans Held for Sale and Investment Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Mortgage loans held for investment, net Mortgage Loans Held for Investment [Member] Mortgage Loans Held for Investment [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Accretable Yield Movement Schedule [Roll Forward] Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] Balance - beginning of the period Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Accretion Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion Reclassifications from non-accretable discount Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference Balance - end of the period Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Mortgage Solutions Business Mortgage Solutions Business [Member] Mortgage Solutions Business [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Cash consideration Payments to Acquire Businesses, Gross Mortgage Banking [Abstract] Minimum net worth required for compliance Minimum Net Worth Required for Compliance Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments Operating Segments [Member] Eliminations Intersegment Eliminations [Member] Corporate and Other Corporate, Non-Segment [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Servicing Segment Servicing Segment [Member] Servicing Segment [Member] Originations Segment Originations Segment [Member] Originations Segment [Member] Xome Xome Segment [Member] Xome Segment [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Revenues: Revenues [Abstract] Service related, net Fees and Commissions, Mortgage Banking and Servicing Net gain on mortgage loans held for sale Total revenues Revenues Total Expenses Operating Expenses Other income (expenses) Other Nonoperating Income (Expense) [Abstract] Interest income Interest Income, Other Interest expense Interest Expense Other Other Nonoperating Income (Expense) Total other income (expenses), net Nonoperating Income (Expense) Income before income tax expense (benefit) Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Depreciation and amortization for property and equipment and intangible assets Total assets Assets Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Nonrecourse debt–legacy assets Nonrecourse Debt [Member] Nonrecourse Debt Legacy Assets [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Participating Interest Financing Participating Interest Financing [Member] Participating Interest Financing [Member] Trust 2016-2 2016-2 HECM Securitization [Member] 2016-2 HECM Securitization [Member] Trust 2016-3 2016-3 HECM Securitization [Member] 2016-3 HECM Securitization [Member] Trust 2017-1 2017-01 HECM Securitization [Member] 2017-01 HECM Securitization [Member] Trust 2017-2 2017-02 HECM Securitization [Member] 2017-02 HECM Securitization [Member] Trust 2018-1 2018-01 HECM Securitization [Member] 2018-01 HECM Securitization [Member] Legacy Asset Legacy Asset [Member] Legacy Asset [Member] Other Other [Member] Other [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Securitized Amount Debt Instrument, Face Amount Non-recourse debt Non-Recourse Debt Unamortized debt issuance costs and issuance discount Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Mortgage Loans Held for Sale and Investment Financing Receivables [Text Block] Equity [Abstract] Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Fair Value Disclosures [Abstract] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Fair Value, by Balance Sheet Grouping Fair Value, by Balance Sheet Grouping [Table Text Block] Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Agency MSRs Agency MSRs [Member] Agency MSRs [Member] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Subsidiary of New Residential Subsidiary of New Residential [Member] Subsidiary of New Residential [Member] Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Loan Subservicing Agreement Loan Subservicing Agreement [Member] Loan Subservicing Agreement [Member] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] New Residential New Residential [Member] New Residential Related Party Transaction [Line Items] Related Party Transaction [Line Items] Excess spread financing Excess Spread Financing at Fair Value Excess spread financing (at fair value) Fees paid Payments for Servicing Fees Payments for Servicing Fees Mortgage servicing rights financing - fair value Mortgage Servicing Rights Liability Resulting from Sale of Servicer Advances, Rights not Accounted for as a Sale Mortgage Servicing Rights Liability Resulting from Sale or Securitization of Servicer Advances, Rights not Accounted for as a Sale UPB subserviced Forward Mortgage Loans Subserviced, Unpaid Principal Balance Forward Mortgage Loans Subserviced, Unpaid Principal Balance Revenue recognized from servicing agreements Contractually Specified Servicing Fees, Late Fees, and Ancillary Fees Earned in Exchange for Servicing Financial Assets, Revenue Recognized Contractually Specified Servicing Fees, Late Fees, and Ancillary Fees Earned in Exchange for Servicing Financial Assets, Revenue Recognized Servicing fees and other performance incentive fees received Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset Loans subject to repurchase right from Ginnie Mae Resell Agreement, Loans and Leases Receivable Resell Agreement, Loans and Leases Receivable Accrued revenues Servicing Fees Receivable Servicing Fees Receivable Goodwill Goodwill Prepaid expenses Prepaid Expense Deposits Deposit Assets Real estate owned (REO),net Real Estate Owned Net Real estate owned (REO), net Intangible assets Intangible Assets, Net (Excluding Goodwill) Receivables from affiliates, net Due from Affiliates Other Other Assets, Miscellaneous Total other assets Other Assets Condensed Financial Information Disclosure [Abstract] Condensed Financial Statements [Table] Condensed Financial Statements [Table] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Nationstar Parent Company [Member] Issuer Subsidiary Issuer [Member] Guarantor (Subsidiaries of Issuer) Guarantor Subsidiaries [Member] Non-Guarantor (Subsidiaries of Issuer) Non-Guarantor Subsidiaries [Member] Reportable entities Reportable Legal Entities [Member] Eliminations Consolidation, Eliminations [Member] Condensed Financial Statements, Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Net gain on mortgage loans held for sale Total revenues Expenses: Operating Expenses [Abstract] Salaries, wages and benefits Labor and Related Expense General and administrative General and Administrative Expense Total expenses Other income (expenses): Nonoperating Income (Expense) [Abstract] Other income (expenses) Gain (loss) from subsidiaries Income (Loss) from Subsidiaries, before Tax Less: Income tax expense (benefit) Income Tax Expense (Benefit) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Less: Net income attributable to non-controlling interests Net income (loss) attributable to Nationstar Receivables [Abstract] Schedule of Accounts Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Transfers and Servicing [Abstract] Servicing Asset at Amortized Cost [Table] Servicing Asset at Amortized Cost [Table] Reverse Mortgage Servicing Rights Reverse Mortgage Servicing Rights [Member] Reverse Mortgage Servicing Rights [Member] Mortgage servicing rights Mortgage Servicing Right [Member] Mortgage Servicing Right [Member] Servicing Asset at Amortized Cost [Line Items] Servicing Asset at Amortized Cost [Line Items] UPB Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement Mortgage servicing liabilities - amortized cost Servicing Liability at Amortized Cost, Balance Accretion of MSL Servicing Liability at Amortized Cost, Accretion Servicing Liability at Amortized Cost, Accretion Other adjustments of MSL Servicing Liability at Amortized Cost, Period Increase (Decrease) Fair value of MSL Fair Value of Servicing Liability, Amortized Cost Fair Value of Servicing Liability, Amortized Cost Impairment Impairment of Intangible Assets, Finite-lived Reclassification of earnings Servicing Fee Income, Reclassification Of Earnings Servicing Fee Income, Reclassification Of Earnings Cumulative incurred losses related to advances and other receivables associated with inactive and liquidated loans Gain (Loss) On Advances And Other Receivables Related To Inactive And Liquidated Loans Gain (Loss) On Advances And Other Receivables Related To Inactive And Liquidated Loans Servicing fee income accretion expense Servicing Fee Income, Accretion Expense Servicing Fee Income, Accretion Expense Payables and Accruals [Abstract] Schedule of Payables and Accrued Liabilities Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Schedule of Loans Subject to Repurchase Reserve Schedule of Loans Subject to Repurchase Reserve [Table Text Block] Schedule of Loans Subject to Repurchase Reserve [Table Text Block] Income Statement [Abstract] Salaries, wages and benefits General and administrative Other income (expenses) Less: Income tax expense (benefit) Net income (loss) per common share attributable to Nationstar: Earnings Per Share [Abstract] Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Weighted average shares of common stock outstanding (in thousands): Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Dilutive effect of stock awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward] Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward] Balance - beginning of period Loans Receivable Held-for-sale, Amount Mortgage loans originated and purchased, net of fees Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Additions to Held-for-sale Loans sold Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Deductions from Held-for-sale Repurchase of loans out of Ginnie Mae securitizations Repurchase of Ginnie Mae Receivables Repurchase of Ginnie Mae Receivables Transfer of mortgage loans held for sale to advances/accounts receivable, net related to claims Claims Made to Third Parties Claims Made to Third Parties Net transfer of mortgage loans held for sale from REO in other assets Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Transfer from Held-for-sale to Held For Investment or Other Assets Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Transfer from Held-for-sale to Held For Investment or Other Assets Changes in fair value Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Changes in Fair Value Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Changes in Fair Value Other purchase-related activities(3) Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Other Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Other Balance - end of period Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Basis of Consolidation Consolidation, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Reclassification Reclassification, Policy [Policy Text Block] Recent Accounting Guidance Adopted and Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Fair Value Fair Value Measurement, Policy [Policy Text Block] Collateral deposit assets (liabilities) Margin Deposit Assets (Liabilities) Margin Deposit Assets (Liabilities) Derivative instruments at fair value, less than Derivative Instruments in Hedges, at Fair Value, Net Reverse Mortgage Interest [Abstract] Reverse Mortgage Interest [Abstract] Repurchased HECM loans Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Repurchase of Home Equity Conversion Mortgages Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Repurchase of Home Equity Conversion Mortgages HECM related receivables Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Home Equity Conversion Mortgage Receivables Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Home Equity Conversion Mortgage Receivables Funded borrower draws not yet securitized Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Funded Draws Not Yet Securitized Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Funded Draws Not Yet Securitized REO related receivables Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Real Estate Owned Related Receivables Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Real Estate Owned Related Receivables Total unsecuritized interests Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized Schedule of Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Servicing Assets at Fair Value Schedule of Servicing Assets at Fair Value [Table Text Block] Schedule of Assumptions for Fair Value of Mortgage Service Rights Schedule of Assumptions for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Table Text Block] Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block] Schedule of Fees Earned in Exchange for Servicing Financial Assets Schedule of Fees Earned in Exchange for Servicing Financial Assets [Table Text Block] Schedule of Fees Earned in Exchange for Servicing Financial Assets [Table Text Block] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Statement, Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Retained Earnings Retained Earnings [Member] Treasury Share Amount Treasury Stock [Member] Total Nationstar Stockholders' Equity Parent [Member] Non-controlling Interests Noncontrolling Interest [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning of Period, shares Shares, Outstanding Beginning of Period Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Shares issued / (surrendered) under incentive compensation plan, shares Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Shares issued / (surrendered) under incentive compensation plan Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Share-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Dividends to non-controlling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Net income (loss) Ending of Period Ending of Period, shares Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] Xome Xome [Member] Xome [Member] 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] Goodwill wrote off Disposal Group, Including Discontinued Operation, Goodwill REO loans with government guarantee Real Estate Owned Loans, Government Guarantee Real Estate Owned Loans, Government Guarantee Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Recurring Fair Value Measurements Fair Value, Measurements, Recurring [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Derivative Instrument Risk [Axis] Derivative Instrument [Axis] Derivative Contract Type [Domain] Derivative Contract [Domain] IRLCs Interest Rate Lock Commitments [Member] Forward sales of MBS Forward Contracts [Member] LPCs Loan Purchase Commitments [Member] Eurodollar futures Eurodollar Future [Member] Treasury futures(2) Future [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] Assets Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Mortgage loans held for sale Mortgages Held-for-sale, Fair Value Disclosure Mortgage servicing rights Derivative financial instruments Derivative Asset, Fair Value, Gross Asset Total assets Assets, Fair Value Disclosure Liabilities Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Derivative financial instruments Derivative Liability, Fair Value, Gross Liability Mortgage servicing rights financing Total liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Unsecured Senior Notes Senior Notes [Member] $600 face value, 6.500% interest rate payable semi-annually, due July 2021 Unsecured Senior Notes Six Point Five Percent Due July 2021 [Member] Unsecured Senior Notes 6.5% Due July 2021 $400 face value, 7.875% interest rate payable semi-annually, due October 2020 Unsecured Senior Notes Seven Point Eight Seven Five Percent Due Oct 2020 [Member] Unsecured Senior Notes 7.875% Due Oct 2020 [Member] $475 face value, 6.500% interest rate payable semi-annually, due August 2018 Unsecured Senior Notes Six Point Five Percent Due August 2018 [Member] Unsecured Senior Notes Six Point Five Percent Due August 2018 [Member] $375 face value, 9.625% interest rate payable semi-annually, due May 2019 Unsecured Senior Notes Nine Point Six Two Five Percent Due May 2019 [Member] Unsecured Senior Notes 9.625% Due May 2019 [Member] $300 face value, 6.500% interest rate payable semi-annually, due June 2022 Unsecured Senior Notes Six Point Five Percent Due July 2022 [Member] Unsecured Senior Notes Six Point Five Percent Due July 2022 [Member] Unsecured senior notes principal amount Unsecured Debt, Gross Unsecured Debt, Gross Unamortized debt issuance costs Debt Issuance Costs, Net Unsecured senior notes, net Unsecured Debt Debt issued Interest Rate Debt Instrument, Interest Rate, Stated Percentage Payables to servicing and subservicing investors Financial Services Liabilities Loans subject to repurchase from Ginnie Mae Assets Sold under Agreements to Repurchase, Repurchase Liability Payables to GSEs and securitized trusts Accounts Payable, Government Sponsored Entity Accounts Payable, Government Sponsored Entity Accounts payable and other accrued liabilities Accrued Liabilities Payable to insurance carriers and insurance cancellation reserves Accrued Insurance Taxes Taxes Payable Accrued bonus and payroll Accrued Salaries Accrued interest Interest Payable Accrued legal expenses Accrued Professional Fees Lease obligations Capital Lease Obligations MSR purchases payable including advances Purchase of Mortgage Servicing Rights Payable Purchase of Mortgage Servicing Rights Payable Repurchase reserves Repurchase Reserve Repurchase Reserve Total payables and accrued liabilities Accounts Payable and Accrued Liabilities Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Financial assets Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Restricted cash Restricted Cash and Cash Equivalents Advances and other receivables, net Services Advances, Net, Fair Value Disclosure Services Advances, Net, Fair Value Disclosure Reverse mortgage interests, net Reverse Funded Loan Advances Reverse funded loan advances Mortgage loans held for investment, net Mortgage Loans Held for Investment Subject to Nonrecourse Debt Legacy Assets Net Mortgage loans held for investment, subject to nonrecourse debt - Legacy Assets, net of allowance for loan losses, respectively Financial liabilities Unsecured senior notes Advance facilities Secured Debt Warehouse facilities Notes Payable, Fair Value Disclosure Mortgage servicing rights financing liability Excess spread financing Excess Spread Financing, Fair Value Disclosure Excess Spread Financing, Fair Value Disclosure Derivative financial instruments Derivative Liability Other nonrecourse debt SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] Reserves for Advances and Other Receivables Advances and Other Receivables Reserves [Member] Advances and Other Receivables Reserves [Member] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] Balance - beginning of period SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Provision and other additions Valuation Allowances and Reserves, Additions Valuation Allowances and Reserves, Additions Write-offs SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction Balance - end of period Commitments and Contingencies Disclosure [Abstract] Loss Contingencies [Table] Loss Contingencies [Table] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Litigation and Regulatory Matters Litigation and Regulatory Matters [Member] Litigation and Regulatory Matters [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Reverse Mortgage Servicing Rights, Excluding Subservicing Reverse Mortgage Servicing Rights, Excluding Subservicing [Member] Reverse Mortgage Servicing Rights, Excluding Subservicing [Member] Warehouse facilities, net of unamortized debt issuance costs Reverse Mortgages [Member] Reverse Mortgages [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Legal fees Legal Fees Estimate of possible loss Loss Contingency, Estimate of Possible Loss Unfunded advance obligations Off-balance Sheet, Maximum Advance Obligation of Reverse Mortgages Serviced Off-balance Sheet, Maximum Advance Obligation of Reverse Mortgages Serviced Receivable Type [Axis] Receivable Type [Axis] Receivable [Domain] Receivable [Domain] Receivables From Prior Servicers, Forward Loan Portfolio Receivables From Prior Servicers, Forward Loan Portfolio [Member] Receivables From Prior Servicers, Forward Loan Portfolio [Member] Account receivables Accounts Receivable, Net Variable Interest Entities and Securitizations [Abstract] Variable Interest Entities and Securitizations Schedule of Assets and Liabilities of VIEs Included in Financial Statements Schedule of Assets and Associated Liabilities Accounted for as Secured Borrowings [Table Text Block] Advances and Other Receivables, Net Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] RSUs Restricted Stock Units (RSUs) [Member] Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] Tranche One Share-based Compensation Award, Tranche One [Member] Tranche Two Share-based Compensation Award, Tranche Two [Member] Tranche Three Share-based Compensation Award, Tranche Three [Member] Title of Individual [Axis] Title of Individual [Axis] Relationship to Entity [Domain] Relationship to Entity [Domain] Certain Employees Certain Employees [Member] Certain Employees [Member] Class of Stock [Line Items] Class of Stock [Line Items] Shares granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vesting percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Compensation expense Allocated Share-based Compensation Expense Schedule of Servicing Assets at Fair Value [Table] Schedule of Servicing Assets at Fair Value [Table] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Servicing Assets at Fair Value [Line Items] Servicing Assets at Fair Value [Line Items] Servicing Asset at Fair Value, Amount [Roll Forward] Servicing Asset at Fair Value, Amount [Roll Forward] Fair value - beginning of period Servicing retained from mortgage loans sold Servicing Asset at Fair Value, Additions, Servicing Retained From Mortgage Loans Sold Servicing Asset at Fair Value, Additions, Servicing Retained From Mortgage Loans Sold Purchases of servicing rights Servicing Asset at Fair Value, Additions Sales of servicing assets Servicing Asset at Fair Value, Disposals Changes in valuation inputs or assumptions used in the valuation model Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions Other changes in fair value Servicing Asset at Fair Value, Other Changes in Fair Value Fair value - end of period Fair Value Measurements Fair Value Disclosures [Text Block] Mortgage loans held for investment, net – UPB Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance Non-accretable Certain Loans Acquired in Transfer, Nonaccretable Difference Accretable Allowance for loan losses Financing Receivable, Allowance for Credit Losses Total mortgage loans held for investment, net 2018 Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year 2019 Long-term Debt, Maturities, Repayments of Principal in Year Two 2020 Long-term Debt, Maturities, Repayments of Principal in Year Three 2021 Long-term Debt, Maturities, Repayments of Principal in Year Four 2022 Long-term Debt, Maturities, Repayments of Principal in Year Five Unsecured senior notes principal amount Unamortized debt issuance costs Reverse funded loan advances [Table] Ginnie Mae Loans Ginnie Mae HECM [Member] Ginnie Mae HECM [Member] Servicing Assets at Fair Value [Line Items] Servicing Assets [Line Items] Servicing Assets [Line Items] Delinquent loans acquired Mortgage Loans Held for Sale, Delinquent Loans Acquired Mortgage Loans Held for Sale, Delinquent Loans Acquired Delinquent loans securitized or sold Mortgage Loans Held for Sale, Delinquent Loans Securitized or Sold Mortgage Loans Held for Sale, Delinquent Loans Securitized or Sold Purchased loans that have re-performed Mortgage Loans Held for Sale, Purchased Loans that have Re-performed Mortgage Loans Held for Sale, Purchased Loans that have Re-performed Mortgage loans held for sale in foreclosure Mortgage Loans in Process of Foreclosure, Amount Sale of mortgage loans held for sale Proceeds from Sale of Mortgage Loans Held-for-sale Gain on sale of mortgage loans held for sale Gain on Sale of Mortgage Loans Gain on Sale of Mortgage Loans Reclassifications from non-accretable discount Provision for reserves Allowance for Loan Losses of Mortgage Loans Held for Investment Allowance for Loan Losses of Mortgage Loans Held for Investment Mortgage loans held for investment in foreclosure Mortgage Loans Held for Investment in foreclosure, amount mortgage loans held for investment in foreclosure, amount Unsecured debt Ownership percentage Guarantor Subsidiary, Ownership Percentage Guarantor Subsidiary, Ownership Percentage Number of subsidiaries as guarantors of unsecured debt Number of Subsidiaries as Guarantors of Unsecured Debt Number of Subsidiaries as Guarantors of Unsecured Debt Servicing advances Servicing Advances Servicing Advances Receivables from agencies, investors and prior servicers Government Sponsored Entity and Investor Receivable Government Sponsored Entity and Investor Receivable Reserves Total advances and other receivables, net Advances and Other Receivables, Net Advances and Other Receivables, Net Mortgage Servicing Rights [Table] Mortgage Servicing Rights [Table] Mortgage Servicing Rights [Table] Mortgage Servicing Rights [Line Items] Mortgage Servicing Rights [Line Items] Mortgage Servicing Rights [Line Items] Mortgage servicing rights - fair value and amortized cost Servicing Asset Excess spread financing - fair value MSR related liabilities - nonrecourse at fair value Mortgage Serving Rights Liability, carried at fair value Mortgage Serving Rights Liability, carried at fair value Mortgage servicing right at amortized cost Servicing Asset at Amortized Cost Owned Serviced Loans [Table] Subserviced Loans [Table] Subserviced Loans [Table] Servicing Assets and Servicing Liabilities Risk [Axis] Servicing Assets and Servicing Liabilities Risk [Axis] Risks Inherent in Servicing Assets and Servicing Liabilities, Type [Domain] Risks Inherent in Servicing Assets and Servicing Liabilities, Type [Domain] Credit sensitive Credit Risk [Member] Interest sensitive Interest Rate Risk [Member] Owned Service Loans [Line Items] Subserviced Loans [Line Items] Subserviced Loans [Line Items] Fair Value Document and Entity Information [Abstract] Document and Entity Information [Abstract] 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 Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Current Reporting Status Entity Current Reporting Status Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Mortgage Servicing Rights (MSRs) and Related Liabilities Transfers and Servicing of Financial Assets [Text Block] Capital Requirements Regulatory Capital Requirements for Mortgage Companies Disclosure [Text Block] Nature of Business and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Schedule of Mortgage Loans Held-for-Sale Schedule of Loans Held-for-Sale [Table Text Block] Schedule of Loans Held-for-Sale [Table Text Block] Reconciliation of Mortgage Loans Held-for-Sale to Cash Flow Reconciliation of Mortgage Loans Held-for-Sale to Cash Flow [Table Text Block] Reconciliation of Mortgage Loans Held-for-Sale to Cash Flow [Table Text Block] Schedule of Loans Held for Investment Schedule of Loans Held for Investment [Table Text Block] Schedule of Loans Held for Investment [Table Text Block] Changes in Accretable Yield on Mortgage Loans Held for Investment Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield [Table Text Block] Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield [Table Text Block] Assets Assets [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Restricted cash Restricted Cash Mortgage servicing rights, $3,356 and $2,937 at fair value, respectively Advances and other receivables, net of reserves of $294 and $284, respectively Reverse mortgage interests, net of reserves of $117 and $115, respectively Mortgage loans held for sale at fair value Mortgage loans held for investment, net Property and equipment, net of accumulated depreciation of $195 and $169, respectively Property, Plant and Equipment, Net Derivative financial instruments at fair value Derivative Asset Other assets Total assets Liabilities and Stockholders' Equity Liabilities and Equity [Abstract] Unsecured senior notes, net Advance facilities, net Warehouse facilities, net Payables and accrued liabilities MSR related liabilities - nonrecourse at fair value Mortgage servicing liabilities Derivative financial instruments at fair value Other nonrecourse debt, net Total liabilities Liabilities Commitments and contingencies (Note 15) Commitments and Contingencies Preferred stock at $0.01 par value - 300,000 thousand shares authorized, no shares issued and outstanding Preferred Stock, Value, Issued Common stock at $0.01 par value - 1,000,000 thousand shares authorized, 109,915 thousand and 109,915 thousand shares issued, respectively Common Stock, Value, Issued Additional paid-in-capital Additional Paid in Capital, Common Stock Retained earnings Retained Earnings (Accumulated Deficit) Treasury shares at cost, 11,752 thousand and 12,187 thousand shares, respectively Treasury Stock, Value Total Nationstar stockholders' equity Stockholders' Equity Attributable to Parent Non-controlling interests Stockholders' Equity Attributable to Noncontrolling Interest Total stockholders' equity Total liabilities and stockholders' equity Liabilities and Equity Guarantor Financial Statement Information Guarantor Financial Statement Information Disclosure [Text Block] Guarantor Financial Statement Information New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] WMIH Corp And Wand Merger Corporation WMIH Corp And Wand Merger Corporation [Member] WMIH Corp And Wand Merger Corporation [Member] WMIH Corp And Wand Merger Corporation, Cash Consideration WMIH Corp And Wand Merger Corporation, Cash Consideration [Member] WMIH Corp And Wand Merger Corporation, Cash Consideration [Member] WMIH Corp And Wand Merger Corporation, Stock Consideration WMIH Corp And Wand Merger Corporation, Stock Consideration [Member] WMIH Corp And Wand Merger Corporation, Stock Consideration [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Right to receive in cash (in dollars per share) Business Combination, Common Stock, Right To Receive In Cash, Per Share Business Combination, Common Stock, Right To Receive In Cash, Per Share Right to receive in shares (shares) Business Combination, Common Stock, Right To Receive In Shares, Per Share Business Combination, Common Stock, Right To Receive In Shares Aggregate amount paid Percentage of stock received in cash Business Combination, Common Stock, Right To Receive In Cash, Percentage Of Stock Business Combination, Common Stock, Right To Receive In Cash, Percentage Of Stock Percentage of stock received in shares Business Combination, Common Stock, Right To Receive In Shares, Percentage Of Stock Business Combination, Common Stock, Right To Receive In Shares, Percentage Of Stock Loans Subject to Repurchase Reserve [Roll Forward] Loans Subject to Repurchase Reserve [Roll Forward] Loans Subject to Repurchase Reserve [Roll Forward] Balance - beginning of period Provisions Repurchase Reserve, Additions Repurchase Reserve, Additions Releases Repurchase Reserve, Reductions Repurchase Reserve, Reductions Charge-offs Repurchase Reserve, Charge-offs Repurchase Reserve, Charge-offs Balance - end of period Notes Payable to Banks Notes Payable to Banks [Member] Unsecured Senior Notes Unsecured Senior Notes [Member] Unsecured Senior Notes [Member] Secured Debt Secured Debt [Member] HECM Securitizations HECM Securitizations [Member] HECM Securitizations [Member] Securities Pledged as Collateral Collateralized Mortgage Backed Securities [Member] Capacity Amount Line of Credit Facility, Maximum Borrowing Capacity Repurchase of unsecured senior notes Loss on repurchase of debt Gain (Loss) on Repurchase of Debt Instrument Interest rate Maximum percentage redeemable on unsecured debt Maximum Percentage Redeemable of Aggregate Principal on Unsecured Debt Maximum percentage redeemable of aggregate principal on unsecured debt with the net proceeds of certain equity offerings at a fixed redemption prices, plus accrued and unpaid interest and additional interest, if any, to the redemption dates, subject to compliance with certain conditions. Weighted average useful life Debt Instrument, Call Date, Weighted Average Term Debt Instrument, Call Date, Weighted Average Term Principal amount outstanding on securitized financing Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement Carrying value on loans outstanding Debt Instrument, Principal Amount Outstanding Debt Instrument, Principal Amount Outstanding Minimum tangible net worth Minimum Tangible Net Worth Required for Compliance Minimum Tangible Net Worth Required for Compliance Notes Payable, Other Notes Payable, Other Payables [Member] Advance facilities Advance Facilities [Member] Advance Facilities [Member] Warehouse Facilities Warehouse Facilities [Member] Warehouse Facilities [Member] Nationstar agency advance receivables trust Nationstar Advance Agency Receivables Trust [Member] Nationstar Advance Agency Receivables Trust [Member] Nationstar mortgage advance receivable trust NSM Advance Receivable Trust (2013) [Member] NSM Advance Receivable Trust (2013) [Member] Nationstar agency advance financing facility Agency Advance Financing Facility (2011) [Member] Agency Advance Financing Facility (2011) [Member] MBS advance financing facility MBS Advance Financing Facility March 2018 [Member] MBS Advance Financing Facility March 2018 [Member] MBS servicer advance facility (2014) MBS Servicer Advance Facility (2014) [Domain] MBS Servicer Advance Facility (2014) [Domain] $1,200 warehouse facility Warehouse Facility $1.3 Billion [Member] Warehouse Facility $1.3 Billion [Member] $1,000 warehouse facility $1000 Warehouse Facility Due September 2017 [Member] $1000 Warehouse Facility Due September 2017 [Member] $950 warehouse facility $950 Warehouse Facility [Member] $950 Warehouse Facility [Member] $600 warehouse facility $600 Warehouse Facility [Member] $600 Warehouse Facility [Member] $500 warehouse facility $500 Warehouse Facility Due September 2017 [Member] $500 Warehouse Facility Due September 2017 [Member] $500 warehouse facility Warehouse Facility $500 Million [Member] Warehouse Facility $500 Million [Member] $500 warehouse facility $500 Million Warehouse Facility Due April 2019 [Member] $500 Million Warehouse Facility Due April 2019 [Member] $300 warehouse facility Warehouse Facility $300 Million Facility Due 2016 [Member] Warehouse Facility $300 Million Facility Due 2016 [Member] $200 warehouse facility Warehouse Facility $200 Million [Member] Warehouse Facility $200 Million [Member] $200 warehouse facility $200 Warehouse Facility, Due 2020 [Member] $200 Warehouse Facility, Due 2020 [Member] $150 warehouse facility $150 Warehouse Facility [Member] $150 Warehouse Facility [Member] $50 warehouse facility $50 Warehouse Facility [Member] $50 Warehouse Facility [Member] $40 warehouse facility $40 million Warehouse Facility [Member] $40 million Warehouse Facility [Member] Mortgage loans, net Loans Held-for-sale, Mortgages [Member] Loans Held-for-sale, Mortgages [Member] Reverse mortgage interests, net MSR and other collateral Mortgage Servicing Rights and Other Collaterals [Member] Mortgage Servicing Rights and Other Collaterals [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR London Interbank Offered Rate (LIBOR) [Member] Debt outstanding, gross Secured Debt, Gross Secured Debt, Gross Debt Outstanding Collateral Pledged Debt Instrument, Collateral Amount Basis spread on rate Debt Instrument, Basis Spread on Variable Rate Transactions with Affiliates Related Party Transactions Disclosure [Text Block] Schedule of Other Assets Schedule of Other Assets [Table Text Block] Schedule of Assets and Associated Liabilities Accounted for as Secured Borrowings [Table] Schedule of Assets and Associated Liabilities Accounted for as Secured Borrowings [Table] Residential Mortgage Residential Mortgage [Member] Trust 2016-2 Trust 2016-3 Other nonrecourse debt Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Restricted cash Restricted Cash [Member] Restricted Cash [Member] Advances and other receivables, net Accounts Receivable [Member] Other assets Other Assets [Member] Advance facilities Notes Payable [Member] Notes Payable [Member] Payables and accrued liabilities Accounts Payable and Accrued Liabilities [Member] Participating interest financing Other Non-Recourse Debt Other Non-Recourse Debt [Member] Other Non-Recourse Debt Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] Number of SPEs Number Of Variable Interest Entities Number Of Variable Interest Entities Assets Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount Reverse Secured Borrowings, Assets, Carrying Amount Reverse Secured Borrowings, Assets, Carrying Amount Reverse Secured Borrowings, Assets, Carrying Amount Liabilities Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount Reverse Secured Borrowings, Liabilities, Carrying Amount Reverse Secured Borrowings, Liabilities, Carrying Amount Reverse Secured Borrowings, Liabilities, Carrying Amount Consolidating Balance Sheet Condensed Balance Sheet [Table Text Block] Consolidating Statement of Operations Condensed Income Statement [Table Text Block] Consolidating Statement of Cash Flows Condensed Cash Flow Statement [Table Text Block] Securitizations and Financings Variable Interest Entities and Securitizations [Text Block] Variable Interest Entities and Securitizations Eliminations Mortgage servicing rights Advances and other receivables, net Property and equipment, net Investment in subsidiaries Investment in Consolidated Subsidiaries Investment in Consolidated Subsidiaries Liabilities and Stockholders' Equity Mortgage servicing liabilities Payables to affiliates Due to Affiliate Total stockholders' equity Net income (loss) attributable to Nationstar Adjustments to reconcile net income (loss) to net cash attributable to operating activities: Net income (loss) attributable to non-controlling interests (Gain) loss from subsidiaries Intercompany Gains (Losses) Intercompany Gains (Losses) Amortization of premiums, net of discount accretion Share-based compensation Other (gain) loss Mortgage loans originated and purchased for sale, net of fees Sales proceeds and loan payment proceeds for mortgage loans held for sale and held for investment Advances and other receivables Reverse mortgage interests Payables and accrued liabilities Property and equipment additions, net of disposals Purchase of forward mortgage servicing rights, net of liabilities incurred Decrease in advance facilities Proceeds from issuance of participating interest financing in reverse mortgage interests, net Repayment of participating interest financing in reverse mortgage interests Debt financing costs Income tax expense (benefit) Effective tax rate Effective Income Tax Rate Reconciliation, Percent Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table] Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table] Change in Discount Rate [Axis] Change in Discount Rate [Axis] Change in Discount Rate [Axis] Change in Discount Rate [Domain] Change in Discount Rate [Domain] Change in Discount Rate [Domain] 100 Basis Points One Hundred Basis Points [Member] One Hundred Basis Points [Member] 200 Basis Points Two Hundred Basis Points [Member] Two Hundred Basis Points [Member] Excess spread financing Excess Spread Financing [Member] Excess Spread Financing [Member] Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items] Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items] Discount Rate, Adverse Change Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of Other than 10 or 20 Percent Adverse Change in Discount Rate Total Prepayment Speeds, 10% Adverse Change Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Prepayment Speed Total Prepayment Speeds, 20% Adverse Change Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Prepayment Speed Reverse Mortgage Interests Reserves [Roll Forward] Reverse Mortgage Interests Reserves [Roll Forward] Reverse Mortgage Interests Reserves [Roll Forward] Balance - beginning of period Provision (release), net Reverse Mortgage Reserves, Period Increase Through Provision for Loan Loss Adjustments Reverse Mortgage Reserves, Period Increase Through Provision for Loan Loss Adjustments Write-offs Reverse Mortgage Reserves, Period Decrease Related to Charge Offs Reverse Mortgage Reserves, Period Decrease Related to Charge Offs Balance - end of period Cash and cash equivalents Total cash, cash equivalents, and restricted cash Schedule of Segment Reporting Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Indebtedness Debt Disclosure [Text Block] Schedule of Derivative Instruments Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Derivative Assets Derivative Financial Instruments, Assets [Member] Derivative Liabilities Derivative Financial Instruments, Liabilities [Member] Loan sale commitments Loan Sale Commitment [Member] Loan Sale Commitment [Member] Interest rate swaps Interest Rate Swap [Member] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Outstanding Notional - Asset Derivative Asset, Notional Amount Fair Value - Asset Outstanding Notional - Liability Derivative Liability, Notional Amount Fair Value - Liability Recorded Gains / (Losses) Derivative, Gain (Loss) on Derivative, Net Reverse Mortgage Interests, Net Reverse Mortgage Interest Disclosure [Text Block] Reverse Mortgage Interest Disclosure [Text Block] Business Segment Reporting Segment Reporting Disclosure [Text Block] Subsequent Events Subsequent Events [Text Block] Contractually specified servicing fees Contractually Specified Servicing Fees, Amount Other service-related income Other Service Related Income Other Service Related Income Incentive and modification income Servicing Fee Income, Incentive and Modification Income Servicing Fee Income, Incentive and Modification Income Late fees Late Fee Income Generated by Servicing Financial Assets, Amount Reverse servicing fees Reverse Servicing Fees, Amount Reverse Servicing Fees, Amount Mark-to-market adjustments Servicing Fee Income, Mark to Market Adjustment Servicing Fee Income, Mark to Market Adjustment Counterparty revenue share Servicing Fee Income, Counter Party Revenue Share Servicing Fee Income, Counter Party Revenue Share Amortization, net of accretion Servicing Fee Income, Amortization Servicing Fee Income, Amortization Total servicing revenue Servicing Fee Income, Net Servicing Fee Income, Net Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Liability Class [Axis] Liability Class [Axis] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Mortgage servicing rights financing Mortgage Servicing Right Liability [Member] Mortgage Servicing Right Liability Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Balance - beginning of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Total gains or losses included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Issuances Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Balance - end of period Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Balance - beginning of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Total gains or losses included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases Issuances Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Balance - end of period Schedule of Notes Payable Schedule of Debt [Table Text Block] Schedule of Unsecured Senior Notes Schedule of Unsecured Senior Notes [Table Text Block] [Table Text Block] for Schedule of Unsecured Senior Notes [Table] Schedule of Maturities of Long-term Debt Schedule of Maturities of Long-term Debt [Table Text Block] Schedule of Other Nonrecourse Debt Schedule Of Other Nonrecourse Debt [Table Text Block] Schedule Of Other Nonrecourse Debt [Table Text Block] Statutory federal rate percentage Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Receivables From Prior Servicers, Reverse Mortgage Interests Receivables From Prior Servicers, Reverse Mortgage Interests [Member] Receivables From Prior Servicers, Reverse Mortgage Interests [Member] HECM Related Receivables HECM Related Receivables [Member] HECM Related Receivables [Member] Participating Interests in HMBS Participating Interests in HMBS [Member] Participating Interests in HMBS [Member] Trust 2017-1 and Trust 2017-2 Trust 2017-1 And Trust 2017-2 [Member] Trust 2017-1 And Trust 2017-2 [Member] Trust 2016-2 and Trust 2016-3 Trust 2016-2 and Trust 2016-3 [Member] Trust 2016-2 and Trust 2016-3 [Member] Reverse Mortgage Interests, Unsecuritized Reverse Mortgage Interests, Unsecuritized [Member] Reverse Mortgage Interests, Unsecuritized [Member] Participating Interests In HECM Loan Participating Interests In HECM Loan [Member] Participating Interests In HECM Loan [Member] HMBS Obligations HMBS Obligations [Member] HMBS Obligations [Member] HECM Loan Portfolio HECM Loan Portfolio [Member] HECM Loan Portfolio [Member] HECM HECM [Member] HECM [Member] Unsecuritized HECM Unsecuritized HECM [Member] Unsecuritized HECM [Member] UPB securitized Reverse Mortgage Interest, Unpaid Principal Balance, Securitized Reverse Mortgage Interest, Unpaid Principal Balance, Securitized UPB unsecuritized Repurchase of HECM loans Reverse Mortgage Interest, Unsecuritized, Repurchase of Home Equity Conversion Mortgages Reverse Mortgage Interest, Unsecuritized, Repurchase of Home Equity Conversion Mortgages Repurchase of HECM loans funded by prior servicer Reverse Mortgage Interest, Unsecuritized, Repurchase of Home Equity Conversion Mortgages Funded by Prior Servicer Reverse Mortgage Interest, Unsecuritized, Repurchase of Home Equity Conversion Mortgages Funded by Prior Servicer Purchase of servicing rights Servicing Asset at Amortized Cost, Additions Purchase discount on acquisitions Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Purchase Discount On Acquisitions Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Purchase Discount On Acquisitions Net proceeds related to acquisition of HECM related receivables Interest earned on HECM loans Interest and Fee Income, Loans Held-for-sale, Mortgages Purchase discount accreted to interest income Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Purchase Discount On Acquisitions Accreted To Interest Income Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Purchase Discount On Acquisitions Accreted To Interest Income Total collateral balances Qualitative and Quantitative Information, Transferor's Continuing Involvement, Collateral Balances Qualitative and Quantitative Information, Transferor's Continuing Involvement, Collateral Balances Total certificate balances Qualitative and Quantitative Information, Transferor's Continuing Involvement, Certificate Balances Qualitative and Quantitative Information, Transferor's Continuing Involvement, Certificate Balances Unconsolidated securitization trusts Financing Receivable, Recorded Investment, Past Due Participating interests in HECM mortgage-backed securities (HMBS) Reverse Mortgage Interest Subject to Non-Recourse Debt Reverse Mortgage Interest Subject to Non-Recourse Debt Other interests securitized Reverse Mortgage Interest, Unpaid Principal Balance, Other Interests Securitized Reverse Mortgage Interest, Unpaid Principal Balance, Other Interests Securitized Unsecuritized interests Reserves Total reverse mortgage interests, net Mortgage loans held for sale – UPB Loans Held-for-Sale, Mortgages, Unpaid Principal Balance Loans Held-for-Sale, Mortgages, Unpaid Principal Balance Mark-to-market adjustment Loans Held-for-Sale, Mortgages, Fair Value Adjustment Loans Held-for-Sale, Mortgages, Fair Value Adjustment Total mortgage loans held for sale Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage UPB Mortgage Loans Held for Sale, Nonaccrual Basis Unpaid Principal Balance Mortgage Loans Held for Sale, Nonaccrual Basis Unpaid Principal Balance Fair Value Fair Value, Mortgage Loans Held for Sale non-accrual status Fair Value, Mortgage Loans Held for Sale non-accrual status Schedule of Assumptions for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Table] Schedule of Assumptions for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Table] MSR Financing Liability MSR Financing Liability [Member] MSR Financing Liability Low High Weighted-average Weighted Average [Member] Weighted Average Assumption [Axis] Weighted Average Assumption [Axis] Weighted Average Assumption [Axis] Weighted Average Assumption [Domain] Weighted Average Assumption [Domain] [Domain] for Weighted Average Assumption [Axis] Financing rates Financing rates [Member] financing rates Recovery rates Recovery rates [Member] Recovery rates Assumption for Fair Value of Mortgage Servicing Rights Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items] Discount rate Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate Total prepayment speeds Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed Expected weighted-average life Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Expected weighted-average life Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Expected weighted-average life Prepayment Speeds Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed Average Life (Years) Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Weighted Average Life Discount Rate Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate Recapture Rate Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Recapture Rate Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Recapture Rate Advance financing rates Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Advanced Financing Rate Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Advanced Financing Rate Annual advance recovery rates Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Annual Advanced Recovery Rates Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Annual Advanced Recovery Rates Payables and Accrued Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block]