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Servicing of Residential Loans - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Forward Loans [Member]    
Fair Value Measurements Of Financial Instruments [Line Items]    
Fair value of servicing rights 136.5us-gaap_ServicingAssetAtAmortizedValueFairValue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wac_ForwardLoansMember		 $ 142.5us-gaap_ServicingAssetAtAmortizedValueFairValue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wac_ForwardLoansMember
Reverse Loans [Member]    
Fair Value Measurements Of Financial Instruments [Line Items]    
Fair value of servicing rights 14.0us-gaap_ServicingAssetAtAmortizedValueFairValue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wac_ReverseLoansMember		 $ 14.1us-gaap_ServicingAssetAtAmortizedValueFairValue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wac_ReverseLoansMember
Minimum [Member]    
Fair Value Measurements Of Financial Instruments [Line Items]    
Adverse Change in assumptions percent 10.00%wac_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesAdverseChangeInAssumptionsPercent
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Maximum [Member]    
Fair Value Measurements Of Financial Instruments [Line Items]    
Adverse Change in assumptions percent 20.00%wac_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesAdverseChangeInAssumptionsPercent
/ us-gaap_RangeAxis
= us-gaap_MaximumMember