STOCK-BASED COMPENSATION - SCHEDULE OF STANDARD AND MARKET-BASED STOCK OPTIONS ACTIVITY (Detail) - Standard Stock Options $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Beginning outstanding balance (in shares)	3,277,991
Granted (in shares)	167,500
Exercised (in shares)	(922,842)
Forfeited (in shares)	(25,103)
Expired (in shares)	(43,420)
Ending outstanding balance (in shares)	2,454,126
Aggregate intrinsic value of options exercised | $	$ 4,726,000
Weighted average fair value of options granted (in dollars per share) | $ / shares	$ 5.48