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STOCK-BASED COMPENSATION (Details 2) - Stock options - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Weighted-average assumptions used to estimate the fair value of options granted              
Dividend yield (as a percent) 0.00%       0.00% 0.00%  
Expected volatility (as a percent) 36.70%       37.10% 42.40%  
Risk-free interest rate (as a percent) 1.50%       1.60% 1.60%  
Expected term 6 years 1 month 6 days       5 years 9 months 18 days 5 years 9 months 18 days  
Stock Options, Number of Shares              
Balance at the beginning of the period (in shares)     13,066,000   13,066,000    
Granted (in shares) 56,000 33,000 903,000 0      
Exercised (in shares)         (7,153,000)    
Cancelled or forfeited (in shares)         (73,000)    
Balance at the end of the period (in shares) 6,832,000       6,832,000   13,066,000
Vested and expected to vest in the future at the end of the period (in shares) 6,428,000       6,428,000    
Exercisable at the end of the period (in shares) 4,005,000       4,005,000    
Stock options, Weighted-Average Exercise Price Per Share              
Balance at the beginning of the period (in dollars per share)     $ 19.73   $ 19.73    
Granted (in dollars per share) $ 135.00 $ 133.43 $ 133.68        
Exercised (in dollars per share)         6.11    
Cancelled or forfeited (in dollars per share)         64.62    
Balance at the end of the period (in dollars per share) 50.05       50.05   $ 19.73
Vested and expected to vest in the future at the end of the period (in dollars per share) 47.00       47.00    
Exercisable at the end of the period (in dollars per share) $ 23.74       $ 23.74    
Weighted-Average Remaining Contractual Term              
Balance at the beginning of the period         5 years 9 months 18 days   3 years 1 month 6 days
Balance at the end of the period         5 years 9 months 18 days   3 years 1 month 6 days
Vested and expected to vest in the future at the end of the period         5 years 7 months 6 days    
Exercisable at the end of the period         4 years    
Aggregate Intrinsic Value              
Balance at the beginning of the period     $ 1,158,412   $ 1,158,412    
Balance at the end of the period $ 581,663       581,663   $ 1,158,412
Vested and expected to vest in the future at the end of the period 566,879       566,879    
Exercisable at the end of the period $ 446,159       $ 446,159