Residential Loans, Net - Activity in Allowance for Loan Losses on Residential Loans, Net (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Receivables [Abstract]
Balance at beginning of period	$ 19,932	$ 13,784	$ 20,435	$ 13,824
Provision for loan losses	95	1,957	1,821	3,526
Charge-offs, net of recoveries	(1,721)	(1,411)	(3,950)	(3,020)
Balance at end of period	$ 18,306	$ 14,330	$ 18,306	$ 14,330