Effect of Derivative Instruments on Consolidated Statements of Operations and Comprehensive (Loss) Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) Gain Included in Mortgage Banking Income	$ (1,969)	$ 14,310	$ 7,465
Treasury Options
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) Gain Included in Mortgage Banking Income	(8,222)	1,968	(10,224)
Eurodollar Futures
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) Gain Included in Mortgage Banking Income	501	333	(38)
Forward commitments to buy/sell loans/mortgage-backed securities
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) Gain Included in Mortgage Banking Income	$ 5,752	$ 12,009	$ 17,727