EMPLOYEE BENEFIT PLANS - (Detail) - USD ($) shares in Thousands	8 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Apr. 30, 2014
Employee Stock Purchase Plan [Line Items]
Maximum matching contribution per dollar per employee contribution		$ 0.50
Maximum match per employee per calendar year		$ 1,000
Employer contributions vesting period		3 years
Employer contributions	$ 497,000	$ 1,119,000	$ 1,033,000	$ 784,000
Class A Common Stock
Employee Stock Purchase Plan [Line Items]
Discount rate		15.00%
Stock issued under stock purchase plan (in shares)	79	70	80	70
Stock available for distribution under stock purchase plan (in shares)		184