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Transfers of Residential Loans - Summary of Cash Flows Related to Transfers of Residential Loans Accounted for as Sales (Detail) (Residential Loan Transfers Accounted for as Sales [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Residential Loan Transfers Accounted for as Sales [Member]
    
Residential Loan Transfers [Line Items]    
Proceeds received from sales, net of fees $ 5,659,144us-gaap_CashFlowsBetweenTransfereeAndTransferorProceedsFromNewTransfers
/ us-gaap_TransactionTypeAxis
= wac_ResidentialLoanTransfersAccountedForAsSalesMember		 $ 4,047,743us-gaap_CashFlowsBetweenTransfereeAndTransferorProceedsFromNewTransfers
/ us-gaap_TransactionTypeAxis
= wac_ResidentialLoanTransfersAccountedForAsSalesMember
Servicing fees collected 22,222us-gaap_CashFlowsBetweenTransfereeAndTransferorServicingFees
/ us-gaap_TransactionTypeAxis
= wac_ResidentialLoanTransfersAccountedForAsSalesMember		 11,117us-gaap_CashFlowsBetweenTransfereeAndTransferorServicingFees
/ us-gaap_TransactionTypeAxis
= wac_ResidentialLoanTransfersAccountedForAsSalesMember
Repurchases of previously sold loans $ 3,130us-gaap_CashFlowsBetweenTransfereeAndTransferorPurchasesOfPreviouslyTransferredFinancialAssets
/ us-gaap_TransactionTypeAxis
= wac_ResidentialLoanTransfersAccountedForAsSalesMember		 $ 0us-gaap_CashFlowsBetweenTransfereeAndTransferorPurchasesOfPreviouslyTransferredFinancialAssets
/ us-gaap_TransactionTypeAxis
= wac_ResidentialLoanTransfersAccountedForAsSalesMember