Residential Loans at Amortized Cost, Net - Activity in Allowance for Loan Losses on Residential Loans, Net (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of the period	$ 10,660	$ 12,084	$ 10,033	$ 14,320
Allowance for Loan and Lease Losses, Adjustments, Net	207	(1,521)	1,435	517
Charge-offs, net of recoveries	(1,184)	(1,675)	(2,199)	(2,907)
Balance at end of the period	3,585	11,930	3,585	11,930
Charge-offs recognized upon acquisition of real estate in satisfaction of residential loans	600	$ 1,000	1,200	$ 2,100
Allowance for Loan and Lease Losses, Loans Sold	$ (5,684)		$ (5,684)