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STOCK BASED COMPENSATION - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Stock Options [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation expenses related to non-vested option awards $ 53.8
Weighted average period of recognition for unrecognized compensation expenses 3 years 3 months 15 days
Restricted Stock Units (RSUs) [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation expenses related to RSUs $ 4.8
Weighted average period of recognition for unrecognized compensation expenses 3 years 4 months 17 days
Ratio of share reserve related to RSUs granted 2
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