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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 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Weighted-average assumptions used to estimate the fair value of options granted      
Dividend yield (as a percent) 0.00% 0.00%  
Expected volatility (as a percent) 36.60% 36.20%  
Risk-free interest rate (as a percent) 2.10% 1.50%  
Expected term 6 years 1 month 6 days 5 years 8 months 12 days  
Stock Options, Number of Shares      
Balance at the beginning of the period (in shares) 22,643    
Granted (in shares) 1,319    
Exercised (in shares) (993)    
Cancelled or forfeited (in shares) (107)    
Balance at the end of the period (in shares) 22,862   22,643
Vested and expected to vest in the future at the end of the period (in shares) 21,438    
Exercisable at the end of the period (in shares) 13,205    
Stock options, Weighted-Average Exercise Price Per Share      
Balance at the beginning of the period (in dollars per share) $ 23.55    
Granted (in dollars per share) 45.94    
Exercised (in dollars per share) 13.72    
Cancelled or forfeited (in dollars per share) 40.16    
Balance at the end of the period (in dollars per share) 25.19   $ 23.55
Vested and expected to vest in the future at the end of the period (in dollars per share) 24.04    
Exercisable at the end of the period (in dollars per share) $ 14.13    
Weighted-Average Remaining Contractual Term      
Balance at the beginning of the period 5 years 10 months 24 days   5 years 9 months 18 days
Balance at the end of the period 5 years 10 months 24 days   5 years 9 months 18 days
Vested and expected to vest in the future at the end of the period 5 years 8 months 12 days    
Exercisable at the end of the period 3 years 10 months 24 days    
Aggregate Intrinsic Value      
Balance at the beginning of the period $ 474,739    
Balance at the end of the period 480,827   $ 474,739
Vested and expected to vest in the future at the end of the period 475,332    
Exercisable at the end of the period $ 423,110