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Mortgage-Backed Debt and Related Collateral - Additional Information (Detail) (USD $)
In Billions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Beneficial Interests And Related Collateral [Line Items]  
Range Of Final Maturities For Residual Trusts 2029 to 2050
Mandatory Cleanup Calls Must Be Performed On Non Residual Trusts When Each Loan Pool Falls To Percent Of Original Principal Balance 10.00%wac_MandatoryCleanupCallsMustBePerformedOnNonResidualTrustsWhenEachLoanPoolFallsToPercentOfOriginalPrincipalBalance
VIE Primary Beneficiary [Member] | Non Residual Trusts [Member]  
Beneficial Interests And Related Collateral [Line Items]  
Expected Period To Exercise Mandatory Clean Up Call Obligation 2017 and continuing through 2019
Collateralized Mortgage Backed Securities [Member] | VIE Primary Beneficiary [Member]  
Beneficial Interests And Related Collateral [Line Items]  
Total mortgage-backed debt collateral 2.2us-gaap_DebtInstrumentCollateralAmount
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_MortgageBackedSecuritiesMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember