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STOCK-BASED COMPENSATION - Weighted-average Assumptions (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Option Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Average risk-free interest rate 1.20% 1.40% 1.20% 1.40%
Expected dividend yield 0.00% 0.00% 0.00% 0.00%
Expected volatility (as a percent) 33.10% 29.70% 33.10% 29.80%
Expected term, period 4 years 6 months 4 years 6 months 4 years 6 months 4 years 6 months
Fair value, per option or share (in dollars per share) $ 31.08 $ 17.70 $ 30.99 $ 17.82
ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Average risk-free interest rate 0.30% 0.20% 0.30% 0.20%
Expected dividend yield 0.00% 0.00% 0.00% 0.00%
Expected volatility (as a percent) 32.80% 26.50% 29.00% 27.60%
Expected term, period 7 months 6 days 7 months 6 days 7 months 6 days 7 months 6 days
Fair value, per option or share (in dollars per share) $ 24.92 $ 16.51 $ 20.85 $ 15.43