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STOCK-BASED COMPENSATION - Fair Value Assumptions (Details) - Stock options - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Weighted-average assumptions used to estimate the fair value of options granted              
Dividend yield (as a percent) 0.00%     0.00% 0.00% 0.00%  
Expected volatility (as a percent) 36.30%     36.70% 36.10% 37.10%  
Risk-free interest rate (as a percent) 1.10%     1.50% 1.40% 1.60%  
Expected term 6 years 4 months 24 days     6 years 1 month 6 days 6 years 3 months 18 days 5 years 9 months 18 days  
Stock Options, Number of Shares              
Balance at the beginning of the period (in shares)     6,590   6,590    
Granted (in shares) (14) 219 961        
Exercised (in shares)         (284)    
Cancelled or forfeited (in shares)         (88)    
Balance at the end of the period (in shares) 7,412       7,412   6,590
Vested and expected to vest in the future at the end of the period (in shares) 7,011       7,011    
Exercisable at the end of the period (in shares) 4,359       4,359    
Stock options, Weighted-Average Exercise Price Per Share              
Balance at the beginning of the period (in dollars per share)     $ 50.85   $ 50.85    
Granted (in dollars per share) $ 157.80 $ 138.53 $ 132.06        
Exercised (in dollars per share)         37.34    
Cancelled or forfeited (in dollars per share)         98.28    
Balance at the end of the period (in dollars per share) 64.14       64.14   $ 50.85
Vested and expected to vest in the future at the end of the period (in dollars per share) 60.94       60.94    
Exercisable at the end of the period (in dollars per share) $ 31.77       $ 31.77    
Weighted-Average Remaining Contractual Term              
Balance at the beginning of the period         5 years 7 months 6 days   5 years 7 months 6 days
Balance at the end of the period         5 years 7 months 6 days   5 years 7 months 6 days
Vested and expected to vest in the future at the end of the period         5 years 4 months 24 days    
Exercisable at the end of the period         3 years 8 months 12 days    
Aggregate Intrinsic Value              
Balance at the beginning of the period     $ 646,497   $ 646,497    
Balance at the end of the period $ 613,113       613,113   $ 646,497
Vested and expected to vest in the future at the end of the period 602,318       602,318    
Exercisable at the end of the period $ 501,457       $ 501,457