Servicing of Residential Loans - Schedule of Servicing Revenue and Fees (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fees Earned in Exchange for Servicing Financial Assets [Line Items]
Servicing fees	$ 680,002	$ 708,491	$ 675,335
Incentive and performance fees	70,197	117,586	157,148
Ancillary and other fees	98,055	104,750	88,430
Servicing revenue and fees	848,254	930,827	920,913
Amortization of servicing rights	(21,801)	(26,827)	(43,101)
Change in fair value of servicing rights	(480,476)	(401,992)	(273,502)
Change in fair value of servicing rights related liabilities	(4,986)	(7,741)	(2,800)
Net servicing revenue and fees	340,991	494,267	601,510
Late fee income	63,300	62,800	48,400
Amortization of servicing liability	7,100	400
Interest expense on servicing rights related liabilities	255,781	273,606	303,103
Servicing Rights Related Liabilities [Member]
Fees Earned in Exchange for Servicing Financial Assets [Line Items]
Interest expense on servicing rights related liabilities	16,300	9,300	$ 4,900
Corporate Joint Venture [Member] | Sub-servicing Performed For WCO [Member]
Fees Earned in Exchange for Servicing Financial Assets [Line Items]
Sub-servicing fees related to servicing assets held by WCO	4,400	1,300
Incentive and performance fees, and ancillary and other fees related to servicing assets held by WCO	700	200
Corporate Joint Venture [Member] | Sale Of Servicing Rights To Walter Capital Opportunity Corp. [Member]
Fees Earned in Exchange for Servicing Financial Assets [Line Items]
Servicing fees	$ 9,800	$ 600