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Fair Value - Significant Unobservable Inputs Used for Assets Measured at Fair Value on Non-Recurring Basis (Detail) (Fair Value, Non-Recurring Basis [Member], Real Estate Owned, Net [Member])
6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
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_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
0.00%us-gaap_FairValueInputsLossSeverity
/ us-gaap_FairValueByAssetClassAxis
= wac_RealEstateOwnedMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Real estate owned, net 59.58%us-gaap_FairValueInputsLossSeverity
/ us-gaap_FairValueByAssetClassAxis
= wac_RealEstateOwnedMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
88.68%us-gaap_FairValueInputsLossSeverity
/ us-gaap_FairValueByAssetClassAxis
= wac_RealEstateOwnedMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Weighted Average [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Real estate owned, net 8.42%us-gaap_FairValueInputsLossSeverity
/ us-gaap_FairValueByAssetClassAxis
= wac_RealEstateOwnedMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
9.48%us-gaap_FairValueInputsLossSeverity
/ us-gaap_FairValueByAssetClassAxis
= wac_RealEstateOwnedMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember