Transfers of Residential Loans - Schedule of Servicing Arrangements Associated with Transfers of Forward Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Residential Loan Transfers [Line Items]
us-gaap_DerecognizedAssetsSecuritizedOrAssetbackedFinancingArrangementAssetsAndAnyOtherFinancialAssetsManagedTogetherDelinquentAmountAtEndOfPeriod	0.36969%	0.30326%
Servicing Rights, Net	$ 1,917,551	$ 1,730,216
Servicer and protective advances, net	1,550,592	1,761,082
Total assets	19,344,532	18,991,977
Servicing Arrangements Associated with Transfers of Forward Loans [Member]
Residential Loan Transfers [Line Items]
Servicing Rights, Net	463,577	331,365
Servicer and protective advances, net	10,457	13,146
Total assets	474,034	344,511
Unpaid Principal Balance of Sold Loans	$ 37,461,331	$ 28,457,216