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STOCK BASED COMPENSATION - Summary of Restricted Stock Unit and Performance Based Restricted Stock Unit Activity (Detail) - Restricted Stock Units and Performance Based Restricted Stock Units
6 Months Ended
Jun. 30, 2017
$ / shares
shares
Shares  
Beginning balance (in shares) | shares 1,358,701
Granted (in shares) | shares 644,629
Vested (in shares) | shares (76,585)
Forfeited (in shares) | shares (37,559)
Ending balance (in shares) | shares 1,889,186
Weighted Average Grant Date Fair Value  
Outstanding, Beginning balance (usd per share) | $ / shares $ 13.39
Granted (usd per share) | $ / shares 18.04
Vested (usd per share) | $ / shares 17.34
Forfeited (usd per share) | $ / shares 13.41
Outstanding, Ending balance (usd per share) | $ / shares $ 14.82