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Fair Value - Summary of Assets and Liabilities in Each Level of Fair Value Hierarchy (Parenthetical) (Detail) (Reverse Loans [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Reverse Loans [Member]
    
Fair Value of Assets and Liabilities Measured on a Recurring Basis [Line Items]    
Assets, Fair Value $ 0us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ReverseLoansMember		 $ 28.5us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ReverseLoansMember