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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, 2018
$ / shares
shares
Shares  
Beginning balance (in shares) | shares 1,889,559
Granted (in shares) | shares 566,943
Vested (in shares) | shares (223,739)
Forfeited (in shares) | shares (367,860)
Ending balance (in shares) | shares 1,864,903
Weighted Average Grant Date Fair Value  
Outstanding, Beginning balance (usd per share) | $ / shares $ 14.84
Granted (usd per share) | $ / shares 24.12
Vested (usd per share) | $ / shares 15.29
Forfeited (usd per share) | $ / shares 16.59
Outstanding, Ending balance (usd per share) | $ / shares $ 17.09