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Fair Value - Reconciliation of Beginning and Ending Balances of Company's Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Parenthetical) (Detail) (Reverse Loans [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets, Fair Value $ 0us-gaap_LoansHeldForSaleFairValueDisclosure $ 28.5us-gaap_LoansHeldForSaleFairValueDisclosure
Loans Receivable [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets, Fair Value $ 0us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ReverseLoansMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember		 $ 28.5us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ReverseLoansMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember