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STOCK BASED COMPENSATION - Summary of RSU Activity (Detail) - Restricted Stock Units (RSUs)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
$ / shares
shares
Number of Units  
Non-vested at January 1, 2019 | shares 429,810
Granted | shares 210,028
Vested and Released | shares (79,601)
Forfeited | shares (33,248)
Non-vested as of March 31, 2019 | shares 526,989
Weighted Average Grant Date Fair Value Per Share  
Non-vested at January 1, 2019 | $ / shares $ 72.02
Granted | $ / shares 48.34
Vested and Released | $ / shares 76.32
Forfeited | $ / shares 72.55
Non-vested as of March 31, 2019 | $ / shares $ 61.89
Weighted Average Remaining Contractual Life  
Non-vested as of March 31, 2019 2 years
Total Aggregate Intrinsic Value  
Non-vested as of March 31, 2019 | $ $ 28.7