Servicing of Residential Loans - Summary of Activity in Servicing Rights Carried at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended				6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2013 Servicing Rights Carried at Fair Value [Member]	Mar. 31, 2013 Servicing Rights Carried at Fair Value [Member]	Dec. 31, 2012 Servicing Rights Carried at Fair Value [Member]	Jun. 30, 2013 ResCap Acquisition [Member]	Jun. 30, 2013 Purchases at Fair Value [Member]	Jun. 30, 2013 Purchases at Fair Value [Member]	Jun. 30, 2013 Capitalized Servicing Rights [Member]	Jun. 30, 2013 Capitalized Servicing Rights [Member]
Servicing Assets at Fair Value [Line Items]
Balance at beginning of period		$ 0	$ 880,950	$ 759,683	$ 26,382
Realization of expected cash flows	(28,590)	(48,786)
Servicing rights capitalized	27,605	28,895				242,604	19,885	530,367	36,305	37,595
Changes in valuation inputs or other assumptions	93,667	92,788
Balance at end of period	$ 880,950	$ 880,950	$ 880,950	$ 759,683	$ 26,382