Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Property, Plant and Equipment [Abstract] Property and Equipment, Net Property, Plant and Equipment Disclosure [Text Block] Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Accounting Policies [Abstract] Cost method investments Cost Method Investments Advertising costs Marketing and Advertising Expense Income Tax Disclosure [Abstract] Amount Effective Income Tax Rate Reconciliation, Amount [Abstract] Tax Expense at Federal Statutory Rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount State taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Non-controlling interests Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Amount Decrease of federal valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Deferred adjustments Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount Federal tax reform impact Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Current payable adjustments Effective Income Tax Rate Reconciliation, Current Payable Adjustments, Amount Effective Income Tax Rate Reconciliation, Current Payable Adjustments, Amount Adjustments related to uncertain tax positions Effective Income Tax Rate Reconciliation, Other Reconciling Items, Uncertain Tax Positions Effective Income Tax Rate Reconciliation, Other Reconciling Items, Uncertain Tax Positions Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Total income tax expense Income Tax Expense (Benefit) Percent Effective Income Tax Rate Reconciliation, Percent [Abstract] Tax Expense at Federal Statutory Rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent State taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Non-controlling interests Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent Decrease of federal valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Deferred adjustments Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent Federal tax reform impact Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Current payable adjustments Effective Income Tax Rate Reconciliation, Current Payable Adjustments, Percent Effective Income Tax Rate Reconciliation, Current Payable Adjustments, Percent Adjustments related to uncertain tax positions Effective Income Tax Rate Reconciliation, Other Reconciling Items, Uncertain Tax Positions, Percent Effective Income Tax Rate Reconciliation, Other Reconciling Items, Uncertain Tax Positions, Percent Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Total income tax expense Effective Income Tax Rate Reconciliation, Percent Deferred Tax Assets Components of Deferred Tax Assets [Abstract] Loss carryforwards (federal, state and capital) Deferred Tax Assets, Operating Loss Carryforwards Loss reserves Deferred Tax Asset, Loss Reserves Loss Reserves Reverse mortgage premiums Deferred Tax Liabilities, Reserve Mortgage Premiums Deferred Tax Liabilities, Reserve Mortgage Premiums Rent expense Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent Restricted share based compensation Deferred Tax Asset, Restricted share based compensation Restricted share based compensation Accruals Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals Partnership interests Deferred Tax Asset, Partnership Interests Deferred Tax Asset, Partnership Interests Reverse mortgage purchase discount Deferred Tax Asset, Reverse Mortgage Purchase Discount Deferred Tax Asset, Reverse Mortgage Purchase Discount Other, net Deferred Tax Assets, Other Total deferred tax assets Deferred Tax Assets, Gross Deferred Tax Liabilities Components of Deferred Tax Liabilities [Abstract] MSR amortization and mark-to-market, net Deferred Tax Liabilities, Mortgage Servicing Rights, Amortization Deferred Tax Liabilities, Mortgage Servicing Rights, Amortization Depreciation and amortization, net Deferred Tax Liabilities, Property, Plant and Equipment Prepaid assets Deferred Tax Liabilities, Prepaid Expenses Goodwill and intangible assets Deferred Tax Liabilities, Goodwill and Intangible Assets Total deferred tax liabilities Deferred Tax Liabilities, Gross Valuation allowance Deferred Tax Assets, Valuation Allowance Net deferred tax liability Deferred Tax Liabilities, Net Commitments and Contingencies Disclosure [Abstract] Mortgage Servicing Rights [Table] Mortgage Servicing Rights [Table] Mortgage Servicing Rights [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Reverse Mortgage Servicing Rights, Excluding Subservicing Reverse Mortgage Servicing Rights, Excluding Subservicing [Member] Reverse Mortgage Servicing Rights, Excluding Subservicing [Member] Reverse mortgage interests, net Reverse Mortgages [Member] Reverse Mortgages [Member] 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] Mortgage Servicing Rights [Line Items] Mortgage Servicing Rights [Line Items] Mortgage Servicing Rights [Line Items] Legal fees Legal Fees Reasonably possible loss Loss Contingency, Estimate of Possible Loss Rental expense Operating Leases, Rent Expense Principal amount outstanding on mortgage servicing rights Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement Maximum unfunded advance obligation Off-balance Sheet, Maximum Advance Obligation of Reverse Mortgages Serviced Off-balance Sheet, Maximum Advance Obligation of Reverse Mortgages Serviced Transfers and Servicing [Abstract] 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] 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 Mortgage Servicing Rights Mortgage Servicing Right [Member] Mortgage Servicing Right [Member] Excess Spread Financing Excess Spread Financing [Member] Excess Spread Financing [Member] MSR Financing Liability MSR Financing Liability [Member] MSR Financing Liability 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] Low High Weighted Average Weighted Average [Member] 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 (in years) 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 Excess Spread Financing, Prepayment Speeds Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed Excess Spread Financing, Average Life (Years) Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Weighted Average Life Excess Spread Financing, Discount Rate Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate Excess Spread Financing, 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 Variable Interest Entities and Securitizations [Abstract] Variable Interest Entities and Securitizations 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 Statement of Financial Position [Abstract] Assets Assets [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Restricted cash Restricted Cash and Cash Equivalents Mortgage servicing rights, $2,937 and $3,160 at fair value, respectively Servicing Asset Advances and other receivables, net of reserves of $284 and $184, respectively Advances and Other Receivables, Net Advances and Other Receivables, Net Reverse mortgage interests, net of reserves of $115 and $131, respectively Reverse Funded Loan Advances Reverse funded loan advances Mortgage loans held for sale at fair value Mortgages Held-for-sale, Fair Value Disclosure 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 Property and equipment, net of accumulated depreciation of $169 and $118, respectively Property, Plant and Equipment, Net Derivative financial instruments at fair value Derivative Asset Other assets Other Assets Total assets Assets Liabilities and Stockholders' Equity Liabilities and Equity [Abstract] Unsecured senior notes, net Unsecured Debt Advance facilities, net Secured Debt Warehouse facilities, net Notes Payable, Fair Value Disclosure Payables and accrued liabilities Accounts Payable and Accrued Liabilities 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 liabilities Servicing Liability at Amortized Cost, Balance Derivative financial instruments at fair value Derivative Liability Other nonrecourse debt, net Non-Recourse Debt Total liabilities Liabilities Commitments and contingencies (Note 18) 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, 12,187 thousand and 12,418 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 Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total liabilities and stockholders' equity Liabilities and Equity Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR London Interbank Offered Rate (LIBOR) [Member] Mortgage loans, net Loans Held-for-sale, Mortgages [Member] Loans Held-for-sale, Mortgages [Member] MSR and other collateral Mortgage Servicing Rights and Other Collaterals [Member] Mortgage Servicing Rights and Other Collaterals [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Servicing Servicing Segment [Member] Servicing Segment [Member] Originations Originations Segment [Member] Originations Segment [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] 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 [Member] MBS Advance Financing Facility [Member] MBS servicer advance facility (2014) MBS Servicer Advance Facility (2014) [Domain] MBS Servicer Advance Facility (2014) [Domain] MBS advance financing facility (2012) MBS Advance Financing Facility 2012 [Member] MBS Advance Financing Facility 2012 [Member] $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] $350 warehouse facility Warehouse Facility $350 Million [Member] Warehouse Facility $350 Million [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] $150 warehouse facility $150 Warehouse Facility [Member] $150 Warehouse Facility [Member] $100 warehouse facility $100 Warehouse Facility [Member] $100 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] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Advance facilities Advance Facilities [Member] Advance Facilities [Member] Warehouse facilities Warehouse Facilities [Member] Warehouse Facilities [Member] Notes Payable, Other Payables Notes Payable, Other Payables [Member] Notes Payable to Banks Notes Payable to Banks [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Capacity Amount Line of Credit Facility, Maximum Borrowing Capacity Outstanding, gross Secured Debt, Gross Secured Debt, Gross Collateral Pledged Debt Instrument, Collateral Amount Debt issuance costs Debt Issuance Costs, Net Outstanding debt Basis spread on variable rate percentage Debt Instrument, Basis Spread on Variable Rate Tax Credit Carryforward [Table] Tax Credit Carryforward [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Forecast Scenario, Forecast [Member] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Internal Revenue Service (IRS) Internal Revenue Service (IRS) [Member] Federal Domestic Tax Authority [Member] State State and Local Jurisdiction [Member] Tax Credit Carryforward [Line Items] Tax Credit Carryforward [Line Items] Tax benefit remeasurement of deferred tax assets and liabilities Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense (Benefit) Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense (Benefit) Tax expense due to the transition tax on deemed repatriation of foreign earnings Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Transition Tax For Accumulated Foreign Earnings, Provisional Income Tax Expense Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Transition Tax For Accumulated Foreign Earnings, Provisional Income Tax Expense Tax expense due to Internal Revenue Service changes Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Changes To Internal Revenue Service, Provisional Income Tax Expense Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Changes To Internal Revenue Service, Provisional Income Tax Expense Release of valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Operating loss carryforwards Operating Loss Carryforwards Limitations on use Operating Loss Carryforwards, Limitations on Use, Annual Limit Operating Loss Carryforwards, Limitations on Use, Annual Limit Valuation allowance Unrecognized tax benefits, uncertain tax positions Unrecognized Tax Benefits, Period Increase (Decrease) Interest and penalties expense Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Unrecognized tax benefits, net effect Unrecognized Tax Benefits that Would Impact Effective Tax Rate 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] Restructuring and Related Activities [Abstract] Disposition and Exit Costs Restructuring and Related Activities Disclosure [Text Block] Retirement Benefits [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Defined Contribution Plan, Tranches [Axis] Defined Contribution Plan, Tranches [Axis] Defined Contribution Plan, Tranches [Axis] Defined Contribution Plan, Tranches [Domain] Defined Contribution Plan, Tranches [Domain] [Domain] for Defined Contribution Plan, Tranches [Axis] Tranche One Defined Contribution Plan, Tranche One [Member] Defined Contribution Plan, Tranche One [Member] Tranche Two Defined Contribution Plan, Tranche Two [Member] Defined Contribution Plan, Tranche Two [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Employer percent match of contribution Defined Contribution Plan, Employer Matching Contribution, Percent of Match Percent match of gross pay Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Matching contributions amount Defined Contribution Plan, Cost Payables and Accruals [Abstract] Loans Subject to Repurchase Reserve [Roll Forward] Loans Subject to Repurchase Reserve [Roll Forward] Loans Subject to Repurchase Reserve [Roll Forward] Repurchase Reserve Repurchase Reserve Repurchase Reserve Provisions Repurchase Reserve, Additions Repurchase Reserve, Additions Releases Repurchase Reserve, Reductions Repurchase Reserve, Reductions Charge-offs Repurchase Reserve, Charge-offs Repurchase Reserve, Charge-offs Repurchase Reserve Condensed Financial Information of Parent Company Only Disclosure [Abstract] Schedule of Condensed Financial Statements [Table] Condensed Financial Statements [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Reportable legal entities Reportable Legal Entities [Member] Eliminations Consolidation, Eliminations [Member] 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] Condensed Financial Statements Condensed Financial Statements, Captions [Line Items] Mortgage servicing rights Advances and other receivables, net Reverse mortgage interests, net Mortgage loans held for investment, net Property and equipment, net Derivative financial instruments at fair value Investment in subsidiaries Investment in Consolidated Subsidiaries Investment in Consolidated Subsidiaries Liabilities and Stockholders' Equity Unsecured senior notes, net Advance facilities, net Warehouse facilities, net Payables and accrued liabilities Derivative financial instruments at fair value Other nonrecourse debt, net Payables to affiliates Due to Affiliate Total stockholders' equity Receivables [Abstract] 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 Advances and Other Receivables, Reserves Advances and Other Receivables, Reserves Total advances and other receivables, net Mortgage Servicing Rights (MSR) and Related Liabilities Transfers and Servicing of Financial Assets [Text Block] Reverse Mortgage Interest [Abstract] Reverse Mortgage Interest [Abstract] Summary of Reverse Mortgage Interests Reverse Mortgage Interest [Table Text Block] Reverse Mortgage Interest [Table Text Block] Segment Reporting [Abstract] Schedule of Segment Reporting Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Mortgage Loans Held for Sale and Investment [Abstract] Mortgage Loans Held for Sale and Investment Mortgage Loans Held for Sale and Investment Financing Receivables [Text Block] 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] 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 Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Common Stock, Shares Outstanding (shares) Entity Common Stock, Shares Outstanding Entity Public Float Entity Public Float Quarterly Financial Information Disclosure [Abstract] Schedule of Supplementary Data Quarterly Financial Information [Table Text Block] 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] Capitalized software costs Software and Software Development Costs [Member] Furniture, fixtures and equipment Furniture and Fixtures [Member] Long-term capital leases - computer equipment Assets Held under Capital Leases [Member] Leasehold improvements Leasehold Improvements [Member] Software in development and other Software Development and Other [Member] Software Development and Other [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property and equipment Property, Plant and Equipment, Gross Less: Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Total property and equipment, net Estimated Useful Life Property, Plant and Equipment, Useful Life 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, Amount 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 Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Customer relationships Customer Relationships [Member] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] Xome Xome Segment [Member] Xome Segment [Member] Restructuring Plan [Axis] Restructuring Plan [Axis] Restructuring Plan [Domain] Restructuring Plan [Domain] Cost Reduction and Operating Effectiveness Cost Reduction And Operating Effectiveness [Member] Cost Reduction And Operating Effectiveness [Member] Facility Closure Facility Closure [Member] Facility Closure [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Other income (expense) Other Nonoperating Income (Expense) [Member] Restructuring Type [Axis] Restructuring Type [Axis] Type of Restructuring [Domain] Type of Restructuring [Domain] Severance and Other Exit Costs Severance And Other Exit Costs [Member] Severance And Other Exit Costs [Member] Employee severance and other Employee Severance [Member] Lease terminations Contract Termination [Member] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Restructuring Adjustments Restructuring Charges Gain on disposal Gain (Loss) on Disposition of Business Asset disposal Disposal Group, Including Discontinued Operation, Assets Intangible asset disposal Disposal Group, Including Discontinued Operation, Intangible Assets Goodwill disposal Disposal Group, Including Discontinued Operation, Goodwill Mortgage Banking [Abstract] Capital Requirements Regulatory Capital Requirements for Mortgage Companies Disclosure [Text Block] Service related, net Fees and Commissions, Mortgage Banking and Servicing Net gain on mortgage loans held for sale Gain (Loss) on Sales of Loans, Net Total revenues Revenues Expenses: Operating Expenses [Abstract] Salaries, wages benefits Labor and Related Expense General and administrative General and Administrative Expense Total expenses Operating Expenses Other income (expenses): Nonoperating Income (Expense) [Abstract] Interest income Interest Income, Other Interest expense Interest Expense Other income (expenses) Other Nonoperating Income (Expense) Gain (loss) from subsidiaries Income (Loss) from Subsidiaries, before Tax Total other income (expenses), net Nonoperating Income (Expense) Income (loss) before income tax expense (benefit) Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Less: Income tax expense Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Less: Net income (loss) attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest Net income (loss) attributable to Nationstar Net Income (Loss) Attributable to Parent Consolidating Balance Sheets Condensed Balance Sheet [Table Text Block] Consolidating Statements of Operations Condensed Income Statement [Table Text Block] Consolidating Statements of Cash Flows Condensed Cash Flow Statement [Table Text Block] 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 year 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 claims receivable in advances and other receivables Claims Made to Third Parties Claims Made to Third Parties Net transfer of mortgage loans held for sale (to)/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 Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Other Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Other Balance - end of year Contractual Obligation, Fiscal Year Maturity Schedule Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block] Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Licenses Licensing Agreements [Member] Trade name Trade Names [Member] Purchased software Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets, Gross Finite-Lived Intangible Assets, Gross Impairment of finite lived assets Impairment of Intangible Assets, Finite-lived Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Net Carrying Amount Finite-Lived Intangible Assets, Net Finite-Lived Intangible Asset, Useful Life Finite-Lived Intangible Asset, Useful Life Indefinite-Lived Intangible Assets Indefinite-Lived Intangible Assets (Excluding Goodwill) Total, Gross Carrying Amount Finite-Lived and Indefinite-Lived Intangible Assets, Gross Finite-Lived and Indefinite-Lived Intangible Assets, Gross Total, Impairment Impairment of Intangible Assets (Excluding Goodwill) Total, Net Carrying Amount Intangible Assets, Net (Excluding Goodwill) Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Share-Based Compensation and Equity Disclosure of Compensation Related Costs, Share-based Payments [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] Securitizations and Financings Variable Interest Entities and Securitizations [Text Block] Variable Interest Entities and Securitizations Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Loan sale commitments Loan Sale Commitment [Member] Loan Sale Commitment [Member] IRLCs Interest Rate Lock Commitments [Member] Forward sales of MBS Forward Contracts [Member] LPCs Loan Purchase Commitments [Member] Treasury futures Future [Member] Eurodollar futures Eurodollar Future [Member] Interest rate swaps and caps Interest Rate Swap [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Derivative Financial Instruments, Assets Derivative Financial Instruments, Assets [Member] Derivative Financial Instruments, Liabilities Derivative Financial Instruments, Liabilities [Member] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Outstanding Notional - Asset Derivative Asset, Notional Amount Outstanding Notional - Liability Derivative Liability, Notional Amount Fair Value - Asset Derivative Asset, Fair Value, Gross Asset Fair Value - Liability Derivative Liability, Fair Value, Gross Liability Recorded Gains / (Losses) Derivative, Gain (Loss) on Derivative, Net Derivative instrument, fair value (less than) Derivative Instruments in Hedges, at Fair Value, Net 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] Mortgage Servicing Rights 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 year Servicing Asset at Fair Value, Amount 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 and cancellation 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 year Valuation and Qualifying Accounts Disclosure [Table] Valuation and Qualifying Accounts Disclosure [Table] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves [Domain] Valuation Allowances and Reserves [Domain] Advances and Other Receivables Reserves [Member] Advances and Other Receivables Reserves [Member] Advances and Other Receivables Reserves [Member] Valuation and Qualifying Accounts Disclosure [Line Items] Valuation and Qualifying Accounts Disclosure [Line Items] Movement in Valuation Allowances and Reserves [Roll Forward] Movement in Valuation Allowances and Reserves [Roll Forward] Balance - beginning of year Valuation Allowances and Reserves, Balance Provision and other additions Valuation Allowances and Reserves, Additions Valuation Allowances and Reserves, Additions Write-offs Valuation Allowances and Reserves, Deductions Balance - end of year Summary of Property and Equipment, Net Property, Plant and Equipment [Table Text Block] Participating interests in 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 Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized Reserves Reverse Funded Loan Advances, Reserves Reverse Funded Loan Advances, Reserves Total reverse mortgage interests, net 2018 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Mortgage Loans Held for Investment 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 year 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 year Statement of Cash Flows [Abstract] Operating Activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net income attributable to Nationstar Adjustments to reconcile net income to net cash attributable to operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Net income (loss) attributable to non-controlling interests Net gain on mortgage loans held for sale Reverse mortgage loan interest income Interest Income, Reverse Mortgages Interest Income, Reverse Mortgages (Gain) loss on sale of assets Gain (Loss) on Disposition of Assets Loss on impairment of assets Asset Impairment Charges 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 of mortgage servicing rights 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 and accretion of discounts Accretion (Amortization) of Discounts and Premiums, Investments Depreciation and amortization Depreciation, Depletion and Amortization Share-based compensation Share-based Compensation Other (gain) loss Operating Activities, Other Income (Loss) Operating Activities, Other Income (Loss) Repurchases of forward loan assets out of Ginnie Mae securitizations Increase (Decrease) in Receivables under Repurchase Agreements Repurchases of reverse loan assets out of Ginnie Mae securitizations, net of assignments to a third party Repurchase Of Reverse Loan Assets Out Of Asset Securitizations Repurchase Of Reverse Loan Assets Out Of Asset Securitizations Mortgage loans originated and purchased, net of fees, and other purchase-related activities 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) benefit 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, net Increase (Decrease) in Accounts Receivable Reverse mortgage interests, net 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 to Acquire Mortgage Servicing Rights (MSR) Net proceeds from acquisition of reverse mortgage servicing portfolio and HECM related receivables Payments for Reverse Mortgage Interests, Net of Participations Sold Payments for Reverse Mortgage Interests, Net of Participations Sold Proceeds on sale of forward and reverse mortgage servicing rights Proceeds from Sale of Mortgage Servicing Rights (MSR) Proceeds on sale of assets Proceeds from Sale of Buildings Business acquisitions, net Payments to Acquire Businesses, Net of Cash Acquired Purchase of investments Payments to Acquire Investments 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] 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 Proceeds from 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 Proceeds from issuance of common stock, net of issuance costs Proceeds from Issuance of Common Stock Repurchase of common stock Payments for Repurchase of Common Stock Transfers (to) from restricted cash, net Proceeds from (Repayments of) Restricted Cash, Financing Activities Excess tax deficiency from share based compensation Excess Tax Benefit (Deficiency) from Share-based Compensation, Financing Activities Excess Tax Benefit (Deficiency) from Share-based Compensation, Financing Activities 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) increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents - beginning of year Cash and cash equivalents - end of year Supplemental Disclosures of Cash Activities Supplemental Cash Flow Elements [Abstract] Cash paid for interest expense Interest Paid Net cash paid for income taxes Income Taxes Paid, Net Income Taxes Income Tax Disclosure [Text Block] Schedule of Equity Based Awards Activity Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Unsecured Senior Notes Senior Notes [Member] 2018 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 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 Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Unsecured senior notes principal amount Debt Instrument, Face Amount Unsecured debt issuance costs Unsecured senior notes, net Payables and Accrued Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] 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] Accounts receivable Accounts Receivable, Net Provision for inactive and liquidated loans that are no longer part of the MSR portfolio 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 Related Party Transactions [Abstract] 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] Subsidiary of New Residential [Member] 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] Agency MSRs Agency MSRs [Member] Agency MSRs [Member] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Newcastle Newcastle [Member] Newcastle [Member] New Residential New Residential [Member] New Residential Springleaf Springleaf [Member] Springleaf [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Servicing fee, percentage of unpaid principal balance Mortgage Servicing Fee, Percentage of Unpaid Principal Balance Mortgage Servicing Fee, Percentage of Unpaid Principal Balance Earned revenue for serving arrangements Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset Excess spread financing Excess Spread Financing at Fair Value Excess spread financing (at fair value) Payments for servicing fees 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 boarded Forward Mortgage Loans Subserviced, Unpaid Principal Balance Boarded Forward Mortgage Loans Subserviced, Unpaid Principal Balance Boarded Revenue recognized for serving arrangements 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 Outstanding receivable from related party Due from Related Parties Indebtedness Debt Disclosure [Text Block] Service related, net Total expenses Less: Income tax expense (benefit) Net income (loss) per common share attributable to Nationstar: Earnings Per Share, Basic and Diluted [Abstract] Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted $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 Face amount Interest rate Debt Instrument, Interest Rate, Stated Percentage Guarantor Financial Statement Information Guarantor Financial Statement Information Disclosure [Text Block] Guarantor Financial Statement Information Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] 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Financing, Fair Value Disclosure Derivative financial instruments 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 [Table Text Block] Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block] Activity of MSRs at Amortized Cost Schedule of Servicing Assets and Liabilities at Amortized Cost [Table Text Block] Schedule of Servicing Assets and Liabilities at Amortized Cost [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 [Table] Statement [Table] Statement [Line Items] Statement [Line Items] Mortgage servicing rights at fair value Advances and other receivables, Reserves Reverse mortgage interests, Reserves Accumulated depreciation Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized (shares) Preferred Stock, Shares Authorized Preferred stock, shares issued (shares) Preferred Stock, Shares Issued Preferred stock, shares outstanding (shares) Preferred Stock, Shares Outstanding Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized (shares) Common Stock, Shares Authorized Common stock, shares issued (shares) Common Stock, Shares, Issued Treasury stock, shares (shares) Treasury Stock, Shares Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2012 Plan Two Thousand Twelve Plan [Member] 2012 Plan [Member] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Restricted Stock Restricted Stock [Member] Share-based Compensation Arrangement by Share-based Payment Award Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Units Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Beginning of Period (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Grants issued (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Forfeited (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Vested (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Ending of Period (shares) Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Beginning of Period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Grants issued (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Forfeited (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Ending of Period (in dollars per share) Organization, Consolidation and Presentation of Financial Statements [Abstract] Nature of Business and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Forward MSRs - fair value Reverse MSRs - amortized cost Servicing Asset at Amortized Cost Mortgage servicing rights Mortgage servicing liabilities - amortized cost Excess spread financing - fair value MSR related liabilities - nonrecourse Margin deposit assets Margin Deposit Assets Schedule of Derivative Instruments Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Significant Accounting Policies Significant Accounting Policies [Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Forward MBS trades 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 Mortgage servicing rights Total assets Assets, Fair Value Disclosure LIABILITIES Derivative financial instruments Total liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Current Income Taxes Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Total current income taxes Current Income Tax Expense (Benefit) Deferred Income Taxes Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) State Deferred State and Local Income Tax Expense (Benefit) Total deferred income taxes Deferred Income Tax Expense (Benefit) Reverse Mortgage Interests Reserves [Roll Forward] Reverse Mortgage Interests Reserves [Roll Forward] Reverse Mortgage Interests Reserves [Roll Forward] Reserves for reverse mortgage interests - beginning of year Provision 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 Other Reverse Mortgage Reserves, Other Reverse Mortgage Reserves, Other Reserves for reverse mortgage interests - end of year Transactions with Affiliates Related Party Transactions Disclosure [Text Block] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Forward MSRs Sold Forward MSRs Sold [Member] Forward MSRs Sold [Member] Forward MSRs Sold, Subservicing Retained Forward MSRs Sold, Subservicing Retained [Member] Forward MSRs Sold, Subservicing Retained [Member] Forward MSRs Sold Reverse Loan Portfolio Reverse Loan Portfolio [Member] Reverse Loan Portfolio [Member] Sales of servicing assets Repayment of excess spread financing Purchase of servicing rights Servicing Asset at Amortized Cost, Additions Acquired mortgage servicing liability Servicing Liability at Amortized Cost, Additions Impairment 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] Other nonrecourse debt Nonrecourse Debt [Member] Nonrecourse Debt Legacy Assets [Member] Restricted cash Restricted Cash [Member] Restricted Cash [Member] Accounts Receivable 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] HECM Securitizations (HMBS) 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] Consolidated reverse mortgage SPE's Number Of Consolidated Reverse Mortgage Special Purpose Entities Number Of Consolidated Reverse Mortgage Special Purpose 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 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] Reclassifications Reclassification, Policy [Policy Text Block] Recent Accounting Guidance Adopted and Recent Accounting Guidance Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Advances and Other Receivables, Net Advance Funding, Policy [Policy Text Block] Advance Funding, Policy [Policy Text Block] Mortgage Loans Held for Sale/Net Gain on Mortgage Loans Held for Sale Finance, Loan and Lease Receivables, Held-for-sale, Policy [Policy Text Block] Mortgage Loans Held for Investment, Net Finance, Loan and Lease Receivables, Held-for-investment, Policy [Policy Text Block] Reverse Mortgage Interests, Net Reverse Mortgage Interests, Policy [Policy Text Block] Reverse Mortgage Interests, Policy [Policy Text Block] Mortgage Servicing Rights (MSRs) Loans and Leases Receivable, Mortgage Banking Activities, Policy [Policy Text Block] MSR Related Liabilities - Nonrecourse Mortgage Servicing Rights Related Liabilities, Policy [Policy Text Block] Mortgage Servicing Rights Related Liabilities, Policy [Policy Text Block] Participating Interest Financing Participating Interests Financing, Policy [Policy Text Block] Participating Interests Financing, Policy [Policy Text Block] Revenues Service Related Revenues, Policy [Policy Text Block] Service Related Revenues, Policy [Policy Text Block] Reserves for Loan Origination and Forward Servicing Activity and Reverse Mortgage Interests Reserves for Loan Origination and Servicing Activity [Policy Text Block] Reserves for Loan Origination and Servicing Activity [Policy Text Block] Property and Equipment, Net Property, Plant and Equipment, Policy [Policy Text Block] Variable Interest Entities Consolidation, Variable Interest Entity, Policy [Policy Text Block] Derivative Financial Instruments Derivatives, Policy [Policy Text Block] Goodwill and Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Cost-method Investments Cost Method Investments, Policy [Policy Text Block] Loans Subject to Repurchase Rights from Ginnie Mae Loans Subject to Repurchase Rights, Policy [Policy Text Block] Loans Subject to Repurchase Rights, Policy [Policy Text Block] Interest Income Revenue Recognition, Interest [Policy Text Block] Share-Based Compensation Expense Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Advertising Costs Advertising Costs, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Ownership percentage Guarantor Subsidiary, Ownership Percentage Guarantor Subsidiary, Ownership Percentage Number of direct wholly owned subsidiaries Number of Subsidiaries as Guarantors of Unsecured Debt Number of Subsidiaries as Guarantors of Unsecured Debt 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] Income Statement [Abstract] Revenues: Revenues [Abstract] Salaries, wages and benefits Net income per common share attributable to Nationstar: Earnings Per Share [Abstract] Weighted average shares of common stock outstanding (in thousands): Earnings Per Share Basic and Diluted Average Shares [Abstract] Average shares: Basic (shares) Weighted Average Number of Shares Outstanding, Basic Dilutive effect of stock awards (shares) Weighted Average Number Diluted Shares Outstanding Adjustment Diluted (shares) Weighted Average Number of Shares Outstanding, Diluted Schedule of Long-term Debt Instruments Schedule of Long-term Debt Instruments [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 Debt [Table 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 Adjustments related to certain earning buyout activities Servicing Fee Income, Reclassification Of Earnings Servicing Fee Income, Reclassification Of Earnings Losses for inactive and liquidated loans that are no longer part of the MSR portfolio Accretion expense Servicing Fee Income, Accretion Expense Servicing Fee Income, Accretion Expense Statement of Stockholders' Equity [Abstract] 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 Shares Amount Treasury Stock [Member] Total Nationstar Stockholders' Equity Parent [Member] Non-controlling Interests Noncontrolling Interest [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance, shares (shares) Shares, Outstanding Balance Shares surrendered under incentive compensation plan (in shares) Stock Issued During Period, Shares, Share-based Compensation, Forfeited Shares issued under incentive compensation plan (in shares) Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Shares issued 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 Stock offering (in shares) Stock Issued During Period, Shares, New Issues Stock offering Stock Issued During Period, Value, New Issues Excess tax deficiency from share-based compensation Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation Repurchase of common stock (in shares) Stock Repurchased During Period, Shares Repurchase of common stock Stock Repurchased During Period, Value Dividends to non-controlling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Net income (loss) Balance