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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, 2018
USD ($)
$ / shares
shares
Number of Units  
Non-vested at January 1, 2018 | shares 267,297
Granted | shares 247,570
Vested and Released | shares (51,302)
Forfeited | shares (10,395)
Non-vested as of March 31, 2018 | shares 453,170
Weighted Average Grant Date Fair Value Per Share  
Non-vested at January 1, 2018 | $ / shares $ 89.74
Granted | $ / shares 62.14
Vested and Released | $ / shares 89.31
Forfeited | $ / shares 90.32
Non-vested as of March 31, 2018 | $ / shares $ 74.43
Weighted Average Remaining Contractual Life  
Non-vested as of March 31, 2018 2 years 6 months 10 days
Total Aggregate Intrinsic Value  
Non-vested as of March 31, 2018 | $ $ 26.5