SHARE-BASED COMPENSATION - Schedule Of Estimated Fair Value Of Option Using Black-Scholes Option Pricing Model, Weighted Average Assumptions (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend rate	0.00%	0.00%	0.00%	0.00%
Risk free interest rate	1.60%	1.50%	1.50%	1.20%
Expected term (in years)	4 years 1 month	4 years 6 months	4 years 4 months	4 years 6 months
Expected volatility	30.00%	31.00%	31.00%	30.00%
Weighted average fair value at grant date	$ 121.04	$ 110.81	$ 121.85	$ 126.87
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend rate	0.00%	0.00%	0.00%	0.00%
Risk free interest rate	0.20%	0.20%	0.20%	0.20%
Expected term (in years)	1 year 2 months 25 days	1 year 3 months 20 days	1 year 3 months	1 year 3 months 20 days
Expected volatility	33.00%	35.00%	33.00%	34.00%
Weighted average fair value at grant date	$ 131.70	$ 115.84	$ 130.37	$ 153.33