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STOCK BASED COMPENSATION - Additional Information (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
shares
Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation expenses related to non-vested option awards $ 38.7
Weighted average period of recognition for unrecognized compensation expenses 3 years 6 months 29 days
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted average period of recognition for unrecognized compensation expenses 3 years 1 month 24 days
Award vesting period annually
Ratio of share reserve related to RSUs granted | shares 2
Unrecognized compensation expenses related to RSUs $ 8.9
Restricted Stock Units (RSUs) [Member] | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Award vesting period 3 years
Restricted Stock Units (RSUs) [Member] | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Award vesting period 5 years