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STOCK BASED COMPENSATION - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected dividend yield 0.00% 0.00%
Ratio of share reserve related to RSUs granted 2  
Minimum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock units, vesting period 3 years  
Maximum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock units, vesting period 5 years  
Non-vested option awards and RSU
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation expense 45.8  
Weighted average period for recognition of compensation expense 2 years 3 months 15 days