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STOCKHOLDERS' EQUITY - Summary of Restricted Stock, Restricted Stock Unit and Performance-based Stock Unit Activity (Detail) - Restricted Stock, Restricted Stock Units, and Performance-Based Stock Units
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended
Jun. 30, 2017
USD ($)
$ / shares
shares
Restricted Stock, Restricted Stock Units, and Performance-Based Stock Units  
Outstanding at beginning of period (in shares) | shares 1,099
Granted (in shares) | shares 438
Forfeited (in shares) | shares (18)
Outstanding at end of period (in shares) | shares 1,149
Unvested, at end of period (in shares) | shares 1,512
Weighted Average Grant Date Fair Value  
Outstanding at beginning of period (in USD per share) | $ / shares $ 7.03
Granted (in USD per share) | $ / shares 12.32
Forfeited (in USD per share) | $ / shares 5.99
Outstanding at end of period (in USD per share) | $ / shares 9.63
Unvested at end of period (in USD per share) | $ / shares $ 10.32
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]  
Weighted Average Remaining Contractual Term, Outstanding 1 year 9 months 12 days
Weighted Average Remaining Contractual Term, Expected to vest 1 year 10 months 23 days
Aggregate Intrinsic Value, Outstanding at end of period | $ $ 7,784
Aggregate Intrinsic Value, Unvested at end of period | $ $ 9,190
Class A Common Stock  
Restricted Stock, Restricted Stock Units, and Performance-Based Stock Units  
Class A Common Stock Vested (in shares) | shares (370)
Weighted Average Grant Date Fair Value  
Class A Common Stock Vested (in USD per share) | $ / shares $ 5.07