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STOCK BASED COMPENSATION - Summary of RSU Activity (Detail) - Restricted Stock Units (RSUs)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Number of Units  
Non-vested at January 1, 2018 | shares 267,297
Granted | shares 293,698
Vested and Released | shares (62,313)
Forfeited | shares (56,151)
Non-vested as of September 30, 2018 | shares 442,531
Weighted Average Grant Date Fair Value Per Share  
Non-vested at January 1, 2018 | $ / shares $ 89.74
Granted | $ / shares 62.23
Vested and Released | $ / shares 88.29
Forfeited | $ / shares 74.89
Non-vested as of September 30, 2018 | $ / shares $ 73.28
Weighted Average Remaining Contractual Life  
Non-vested as of September 30, 2018 2 years 29 days
Total Aggregate Intrinsic Value  
Non-vested as of September 30, 2018 | $ $ 26.0