STOCK BASED COMPENSATION - Summary of Stock Option Plan (Detail)	6 Months Ended
	Jun. 30, 2017 $ / shares shares
Shares
Outstanding, Beginning balance (in shares) | shares	2,431,347
Granted (in shares) | shares	785,132
Exercised (in shares) | shares	(261,336)
Canceled/Forfeited (in shares) | shares	(54,912)
Outstanding, Ending balance (in shares) | shares	2,900,231
Options exercisable (in shares) | shares	918,087
Weighted Average Exercise Price Per Share
Outstanding, Beginning balance (usd per share) | $ / shares	$ 17.09
Granted (usd per share) | $ / shares	19.03
Exercised (usd per share) | $ / shares	18.12
Canceled/Forfeited (usd per share) | $ / shares	17.86
Outstanding, Ending balance (usd per share) | $ / shares	17.52
Options exercisable (usd per share) | $ / shares	$ 19.62