GUARANTY OBLIGATION AND ALLOWANCE FOR RISK-SHARING OBLIGATIONS - Summary of Allowance for Risk-Sharing Obligations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Allowance for Risk-Sharing Contracts
Beginning balance	$ 3,648	$ 5,810	$ 3,613	$ 5,586
Provision for risk-sharing obligations	109	332	74	453
Write-offs		(2,567)		(2,567)
Other	12	(175)	82	(72)
Ending balance	3,769	$ 3,400	3,769	$ 3,400
Fannie Mae DUS program
Allowance for Risk-Sharing Contracts
Maximum quantifiable contingent liability associated with guarantees	$ 5,400,000		$ 5,400,000