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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, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
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) 34.50%     35.30% 34.90% 36.60%  
Risk-free interest rate (as a percent) 2.90%     1.70% 2.80% 2.10%  
Expected term 6 years 1 month 6 days     5 years 10 months 24 days 6 years 1 month 6 days 6 years 1 month 6 days  
Stock Options, Number of Shares              
Balance at the beginning of the period (in shares)     17,819   17,819    
Granted (in shares) 11 360 2,615        
Exercised (in shares)         (1,308)    
Cancelled or forfeited (in shares)         (495)    
Balance at the end of the period (in shares) 19,002       19,002   17,819
Vested and expected to vest in the future at the end of the period (in shares) 18,061       18,061    
Exercisable at the end of the period (in shares) 10,179       10,179    
Stock options, Weighted-Average Exercise Price Per Share              
Balance at the beginning of the period (in dollars per share)     $ 29.62   $ 29.62    
Granted (in dollars per share) $ 58.77 $ 51.72 $ 58.76        
Exercised (in dollars per share)         18.71    
Cancelled or forfeited (in dollars per share)         43.71    
Balance at the end of the period (in dollars per share) 34.45       34.45   $ 29.62
Vested and expected to vest in the future at the end of the period (in dollars per share) 33.59       33.59    
Exercisable at the end of the period (in dollars per share) $ 22.51       $ 22.51    
Weighted-Average Remaining Contractual Term              
Balance at the beginning of the period         6 years 1 month 6 days   6 years 1 month 6 days
Balance at the end of the period         6 years 1 month 6 days   6 years 1 month 6 days
Vested and expected to vest in the future at the end of the period         5 years 10 months 24 days    
Exercisable at the end of the period         4 years 3 months 18 days    
Aggregate Intrinsic Value              
Balance at the beginning of the period     $ 600,032   $ 600,032    
Balance at the end of the period $ 454,476       454,476   $ 600,032
Vested and expected to vest in the future at the end of the period 447,291       447,291    
Exercisable at the end of the period $ 364,103       $ 364,103