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Fair Value - Fair Value Option Quantitative Disclosures (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage loans held for sale $ 11,832,630us-gaap_LoansReceivableFairValueDisclosure $ 10,341,375us-gaap_LoansReceivableFairValueDisclosure
Fair Value Option Assets Fair Value Balance 11,832,630wac_FairValueOptionAssetsFairValueBalance 10,341,375wac_FairValueOptionAssetsFairValueBalance
Fair Value Option Unpaid Principal Asset Balance 14,428,943wac_FairValueOptionUnpaidPrincipalAssetBalance 9,839,811wac_FairValueOptionUnpaidPrincipalAssetBalance
Mortgage-backed debt at fair value (unpaid principal balance of $657,174 and $735,379 at December 31, 2014 and 2013 respectively) 653,167wac_BeneficialInterestAtFairValue 684,778wac_BeneficialInterestAtFairValue
Home Equity Conversion Mortgage Backed Security Related Obligations 9,951,895wac_HomeEquityConversionMortgageBackedSecurityRelatedObligations 8,652,746wac_HomeEquityConversionMortgageBackedSecurityRelatedObligations
Fair Value Option Liabilities Fair Value Balance 10,605,062wac_FairValueOptionLiabilitiesFairValueBalance 9,337,524wac_FairValueOptionLiabilitiesFairValueBalance
Beneficial Interest At Fair Value Unpaid Principal Balance 657,174wac_BeneficialInterestAtFairValueUnpaidPrincipalBalance 735,379wac_BeneficialInterestAtFairValueUnpaidPrincipalBalance
Home Equity Conversion Mortgage Backed Security Related Obligations, Unpaid Principal Balance 9,172,083wac_HomeEquityConversionMortgageBackedSecurityRelatedObligationsUnpaidPrincipalBalance 7,959,711wac_HomeEquityConversionMortgageBackedSecurityRelatedObligationsUnpaidPrincipalBalance
Fair Value Option Unpaid Principal Liability Balance 9,829,257wac_FairValueOptionUnpaidPrincipalLiabilityBalance 8,695,090wac_FairValueOptionUnpaidPrincipalLiabilityBalance
Reverse Loans [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage loans held for sale 10,064,365us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ReverseLoansMember		 8,738,503us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ReverseLoansMember
Loans Receivable, Unpaid Principal Balance 9,340,270wac_LoansReceivableAtFairValueUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ReverseLoansMember		 8,135,927wac_LoansReceivableAtFairValueUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ReverseLoansMember
Mortgage Loans Held for Sale [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage loans held for sale 1,124,615us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ForwardLoansHeldForSaleMember		 1,015,607us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ForwardLoansHeldForSaleMember
Loans Receivable, Unpaid Principal Balance 1,071,787wac_LoansReceivableAtFairValueUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ForwardLoansHeldForSaleMember		 976,774wac_LoansReceivableAtFairValueUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ForwardLoansHeldForSaleMember
Residential Loans Related To Non Residual Trusts [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage loans held for sale 586,433us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ResidentialLoansRelatedToNonResidualTrustsMember		 587,265us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ResidentialLoansRelatedToNonResidualTrustsMember
Loans Receivable, Unpaid Principal Balance 650,382wac_LoansReceivableAtFairValueUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ResidentialLoansRelatedToNonResidualTrustsMember		 727,110wac_LoansReceivableAtFairValueUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ResidentialLoansRelatedToNonResidualTrustsMember
Charged Off Loans [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage loans held for sale 57,217us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ChargedOffLoansMember		 0us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ChargedOffLoansMember
Loans Receivable, Unpaid Principal Balance $ 3,366,504wac_LoansReceivableAtFairValueUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ChargedOffLoansMember		 $ 0wac_LoansReceivableAtFairValueUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wac_ChargedOffLoansMember