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STOCK BASED COMPENSATION - Summary of PSU Activity (Detail) - Performance-Based Restricted Stock Units
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Number of Units  
Non-vested at January 1, 2018 | shares 33,447
Granted | shares 399,658
Forfeited | shares (12,880)
Non-vested as of March 31, 2018 | shares 420,225
Weighted Average Grant Date Fair Value Per Share  
Non-vested at January 1, 2018 | $ / shares $ 82.85
Granted | $ / shares 62.09
Forfeited | $ / shares 82.92
Non-vested as of March 31, 2018 | $ / shares $ 63.11
Weighted Average Remaining Contractual Life  
Non-vested as of March 31, 2018 2 years 3 months 26 days
Total Aggregate Intrinsic Value  
Non-vested as of March 31, 2018 | $ $ 24.6