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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
9 Months Ended
Sep. 30, 2017
$ / shares
shares
Shares  
Beginning balance (in shares) | shares 1,358,701
Granted (in shares) | shares 647,354
Vested (in shares) | shares (78,221)
Forfeited (in shares) | shares (53,892)
Ending balance (in shares) | shares 1,873,942
Weighted Average Grant Date Fair Value  
Outstanding, Beginning balance (usd per share) | $ / shares $ 13.39
Granted (usd per share) | $ / shares 18.06
Vested (usd per share) | $ / shares 17.43
Forfeited (usd per share) | $ / shares 13.95
Outstanding, Ending balance (usd per share) | $ / shares $ 14.82