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SHARE-BASED COMPENSATION - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Apr. 20, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares reserved for future issuance 2,200,000      
Options forfeited/expired 14,000      
Options exercisable, number of shares 1,900,000      
Options exercisable, weighted-average exercise price (usd per share) $ 426.78      
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares reserved for future issuance 900,000      
Forfeited (in shares) 15,000      
Employee Stock Purchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee Stock Purchase Plan, number of shares purchased by employees 45,000 41,000    
Employee Stock Purchase Plan, value of shares purchased by employees $ 20.9 $ 18.1    
ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares reserved for future issuance     2,530,105 2,030,105
2010 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares reserved for future issuance     8,150,000 7,050,000