Servicing of Residential Loans - Servicing Revenue and Fees (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Servicing Liabilities at Fair Value [Line Items]
Servicing fees	$ 176,316	$ 173,147	$ 348,048	$ 339,180
Incentive and performance fees	33,681	41,482	65,419	84,339
Ancillary and other fees	25,436	20,087	50,919	42,740
Servicing revenue and fees	235,433	234,716	464,386	466,259
Amortization of servicing rights	(6,965)	(10,188)	(13,978)	(21,305)
Change in fair value of servicing rights	1,141	(83,552)	(128,094)	(131,186)
Change in fair value of excess servicing spread liability	(5,694)	0	(7,512)	0
Net servicing revenue and fees	223,915	140,976	314,802	313,768
Late fees	15,200	10,300	29,600	22,600
Interest expense	68,665	$ 74,690	143,536	$ 149,539
Residential Mortgage [Member]
Servicing Liabilities at Fair Value [Line Items]
Interest expense	$ 2,100		$ 4,700