Goodwill and Intangible Assets, Net - Schedule of Goodwill by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended					12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Beginning balance						$ 367,911	$ 575,468
Impairment	$ (13,200)	$ (91,000)	$ (215,400)	$ (151,000)	$ (56,500)	(319,551)	(207,557)
Acquisition of RCS net assets						3,784
Reclassification to assets held for sale						(4,397)
Ending balance	47,747			367,911		47,747	367,911
Servicing [Member]
Goodwill [Roll Forward]
Beginning balance						320,164	471,182
Impairment	(13,200)	$ (91,000)	$ (215,400)			(319,551)	(151,018)
Acquisition of RCS net assets						3,784
Reclassification to assets held for sale						(4,397)
Ending balance	0			320,164		0	320,164
Originations [Member]
Goodwill [Roll Forward]
Beginning balance						47,747	47,747
Impairment						0	0
Acquisition of RCS net assets						0
Reclassification to assets held for sale						0
Ending balance	47,747			47,747		47,747	47,747
Reverse Mortgage [Member]
Goodwill [Roll Forward]
Beginning balance						0	56,539
Impairment					$ (56,500)	0	(56,539)
Acquisition of RCS net assets						0
Reclassification to assets held for sale						0
Ending balance	$ 0			$ 0		$ 0	$ 0