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Fair Value - Significant Unobservable Inputs Used for Assets Measured at Fair Value on Non-Recurring Basis (Detail) (Real Estate Owned, Net [Member])
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Real estate owned, net 0.00%us-gaap_FairValueInputsLossSeverity
/ us-gaap_FairValueByAssetClassAxis
= wac_RealEstateOwnedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 0.00%us-gaap_FairValueInputsLossSeverity
/ us-gaap_FairValueByAssetClassAxis
= wac_RealEstateOwnedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Real estate owned, net 88.67%us-gaap_FairValueInputsLossSeverity
/ us-gaap_FairValueByAssetClassAxis
= wac_RealEstateOwnedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 59.58%us-gaap_FairValueInputsLossSeverity
/ us-gaap_FairValueByAssetClassAxis
= wac_RealEstateOwnedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Weighted Average [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Real estate owned, net 9.14%us-gaap_FairValueInputsLossSeverity
/ us-gaap_FairValueByAssetClassAxis
= wac_RealEstateOwnedMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		 8.04%us-gaap_FairValueInputsLossSeverity
/ us-gaap_FairValueByAssetClassAxis
= wac_RealEstateOwnedMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember