STOCK-BASED COMPENSATION - Fair Value Assumptions (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
2011 Omnibus Incentive Plan
Stock Options, Number of Shares
Granted (in shares)					4,595,021
Stock options
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)					37.10%	41.40%	47.50%
Risk-free interest rate (as a percent)					1.57%	1.55%	0.98%
Expected term					5 years 9 months 18 days	5 years 9 months 18 days	5 years 8 months 12 days
Stock Options, Number of Shares
Balance at the beginning of the period (in shares)				13,066,000	13,066,000
Granted (in shares)	6,000	56,000	33,000	903,000
Exercised (in shares)					(7,379,000)
Cancelled or forfeited (in shares)					(95,000)
Balance at the end of the period (in shares)	6,590,000				6,590,000	13,066,000
Vested and expected to vest in the future at the end of the period (in shares)	6,238,000				6,238,000
Exercisable at the end of the period (in shares)	3,899,000				3,899,000
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)	$ 134.20	$ 135.00	$ 133.43	$ 133.68
Exercised (in dollars per share)					6.69
Cancelled or forfeited (in dollars per share)					71.59
Balance at the end of the period (in dollars per share)	50.85				50.85	$ 19.73
Vested and expected to vest in the future at the end of the period (in dollars per share)	48.05				48.05
Exercisable at the end of the period (in dollars per share)	$ 24.36				$ 24.36
Weighted-Average Remaining Contractual Term
Balance at the beginning of the period					5 years 7 months 6 days	3 years 1 month 6 days
Balance at the end of the period					5 years 7 months 6 days	3 years 1 month 6 days
Vested and expected to vest in the future at the end of the period					5 years 6 months
Exercisable at the end of the period					3 years 10 months 24 days
Aggregate Intrinsic Value
Balance at the beginning of the period				$ 1,158,412	$ 1,158,412
Balance at the end of the period	$ 646,497				646,497	$ 1,158,412
Vested and expected to vest in the future at the end of the period	629,496				629,496
Exercisable at the end of the period	$ 485,835				$ 485,835
Stock options, non-employee directors | 2009 Directors Plan
Stock Options, Number of Shares
Granted (in shares)					87,964