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STOCKHOLDERS' EQUITY - Summary of Restricted Stock, Restricted Stock Unit and Performance-based Stock Unit Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Weighted Average Exercise Price  
Outstanding at beginning of period (in USD per share) | $ / shares $ 7.03
Granted (in USD per share) | $ / shares 12.13
Forfeited (in USD per share) | $ / shares 5.94
Outstanding at end of period (in USD per share) | $ / shares 9.20
Expected to vest at end of period (in USD per share) | $ / shares $ 9.97
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 11 months
Weighted Average Remaining Contractual Term, Expected to vest 2 years
Aggregate Intrinsic Value, Outstanding at end of period | $ $ 5,936
Aggregate Intrinsic Value, Expected to vest at end of period | $ $ 6,539
Restricted Stock, Restricted Stock Units, and Performance-Based Stock Units  
Restricted Stock, Restricted Stock Units, and Performance-Based Stock Units  
Outstanding at beginning of period | shares 1,099
Granted (in shares) | shares 407
Forfeited (in shares) | shares (17)
Outstanding at end of period | shares 1,201
Expected to vest at end of period (in shares) | shares 1,563
Class A Common Stock  
Weighted Average Exercise Price  
Class A Common Stock Vested (in USD per share) | $ / shares $ 5.01
Class A Common Stock | Restricted Stock, Restricted Stock Units, and Performance-Based Stock Units  
Restricted Stock, Restricted Stock Units, and Performance-Based Stock Units  
Class A Common Stock Vested (in shares) | shares (288)