GUARANTY OBLIGATION AND ALLOWANCE FOR RISK-SHARING OBLIGATIONS - Summary of Allowance for Risk-Sharing Obligations (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) loan	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Allowance for Risk-Sharing Contracts
Beginning balance	$ 5,586	$ 3,904
Provision (benefit) for risk-sharing obligations	(145)	1,680	$ 1,783
Write-offs	(1,757)	(808)
Other	(71)	810
Ending balance	$ 3,613	5,586	$ 3,904
Number of defaulted at risk loans on which loss sharing settlements were reached | loan	3
Recoveries on risk-sharing obligations previously written off	$ 800	0
Fannie Mae DUS program
Allowance for Risk-Sharing Contracts
Maximum quantifiable contingent liability associated with guarantees	$ 4,900,000	$ 4,900,000