GUARANTY OBLIGATION AND ALLOWANCE FOR RISK-SHARING OBLIGATIONS - Summary of Allowance for Risk-Sharing Obligations (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Allowance for Risk-Sharing Contracts
Beginning balance	$ 3,058	$ 3,546	$ 3,783	$ 3,613
Provision (benefit) for risk-sharing obligations	721	122	257	(35)
Other	291	(20)	30	70
Ending balance	4,070	$ 3,648	4,070	$ 3,648
Fannie Mae DUS program
Allowance for Risk-Sharing Contracts
Maximum quantifiable contingent liability associated with guarantees	$ 6,200,000		$ 6,200,000