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STOCK BASED COMPENSATION - Summary of RSU Activity (Detail) - Restricted Stock Units (RSUs)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Number of Units  
Non-vested at January 1, 2019 | shares 429,810
Granted | shares 247,966
Vested and released | shares (99,064)
Forfeited | shares (63,631)
Non-vested as of June 30, 2019 | shares 515,081
Weighted Average Grant Date Fair Value Per Share  
Non-vested at January 1, 2019 | $ / shares $ 72.02
Granted | $ / shares 48.78
Vested and released | $ / shares 74.07
Forfeited | $ / shares 71.50
Non-vested as of June 30, 2019 | $ / shares $ 60.49
Weighted Average Remaining Contractual Life  
Non-vested as of June 30, 2019 1 year 9 months 18 days
Total Aggregate Intrinsic Value  
Non-vested as of June 30, 2019 | $ $ 24.6