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Fair Value - Fair Value, Option, Instrument Specific Credit Risk (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) from changes in instrument-specific credit risk associated with assets under the fair value option $ 61,581us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets $ (1,437)us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets $ 5,859us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets
Gains (losses) from changes in instrument-specific credit risk associated with liabilities under the fair value option (33,146)us-gaap_FairValueOptionCreditRiskGainsLossesOnLiabilities 54us-gaap_FairValueOptionCreditRiskGainsLossesOnLiabilities (5,416)us-gaap_FairValueOptionCreditRiskGainsLossesOnLiabilities
Loans Receivable [Member] | Mortgage Loans related to Non-Residual Trusts [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) from changes in instrument-specific credit risk associated with assets under the fair value option 62,103us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ResidentialLoansRelatedToNonResidualTrustsMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember		 (4,340)us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ResidentialLoansRelatedToNonResidualTrustsMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember		 17,845us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ResidentialLoansRelatedToNonResidualTrustsMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
Loans Receivable [Member] | Charged Off Loans [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) from changes in instrument-specific credit risk associated with assets under the fair value option 7,598us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ChargedOffLoansMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember		 0us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ChargedOffLoansMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember		 0us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ChargedOffLoansMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
Receivables Related to Non-Residual Trusts [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) from changes in instrument-specific credit risk associated with assets under the fair value option (8,120)us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AccountsReceivableMember		 2,903us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AccountsReceivableMember		 (11,986)us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AccountsReceivableMember
Excess Servicing Spread [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) from changes in instrument-specific credit risk associated with liabilities under the fair value option 2,292us-gaap_FairValueOptionCreditRiskGainsLossesOnLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= wac_ExcessServicingSpreadMember		 0us-gaap_FairValueOptionCreditRiskGainsLossesOnLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= wac_ExcessServicingSpreadMember		 0us-gaap_FairValueOptionCreditRiskGainsLossesOnLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= wac_ExcessServicingSpreadMember
Mortgage-Backed Debt Related to Non-Residual Trusts [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) from changes in instrument-specific credit risk associated with liabilities under the fair value option $ (35,438)us-gaap_FairValueOptionCreditRiskGainsLossesOnLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= wac_MortgageBackedDebtRelatedToNonResidualTrustsMember		 $ 54us-gaap_FairValueOptionCreditRiskGainsLossesOnLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= wac_MortgageBackedDebtRelatedToNonResidualTrustsMember		 $ (5,416)us-gaap_FairValueOptionCreditRiskGainsLossesOnLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= wac_MortgageBackedDebtRelatedToNonResidualTrustsMember