STOCK-BASED COMPENSATION (Details 2) (Stock options, USD $)	3 Months Ended				12 Months Ended
	Dec. 31, 2012 Y	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012 Y	Dec. 31, 2012 Y	Dec. 31, 2011 Y	Dec. 31, 2010 Y
Stock options
Stock-based compensation
Excess tax benefit realized for tax deductions from non-qualified stock option exercises and disqualifying dispositions of incentive stock options					$ 19,700,000	$ 3,800,000	$ 12,400,000
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)					48.10%	53.60%	58.20%
Risk-free interest rate (as a percent)					0.74%	1.50%	1.90%
Expected term (in years)					5.4	5.8	5.9
Stock Options, Number of Shares
Balance at the beginning of the period (in shares)				18,569,000	18,569,000
Granted (in shares)	53,000	207,000	65,000	120,000
Exercised (in shares)					(4,857,000)
Cancelled or forfeited (in shares)					(157,000)
Balance at the end of the period (in shares)	14,000,000				14,000,000	18,569,000
Vested and expected to vest in the future at the end of the period (in shares)	13,542,000				13,542,000
Exercisable at the end of the period (in shares)	11,043,000				11,043,000
Stock options, Weighted-Average Exercise Price Per Share
Balance at the beginning of the period (in dollars per share)				$ 8.57	$ 8.57
Granted (in dollars per shares)	$ 47.63	$ 57.99	$ 66.43	$ 57.45	$ 47.63
Exercised (in dollars per share)	$ 2.45				$ 2.45
Cancelled or forfeited (in dollars per share)					$ 20.30
Balance at the end of the period (in dollars per share)	$ 12.12				$ 12.12	$ 8.57
Vested and expected to vest in the future at the end of the period (in dollars per share)	$ 11.41				$ 11.41
Exercisable at the end of the period (in dollars per share)	$ 8.29				$ 8.29
Weighted-Average Remaining Contractual Term
Balance at the beginning of the period (in years)				4.1	4.1
Balance at the end of the period (in years)	4.1				4.1	4.1
Vested and expected to vest in the future at the end of the period (in years)					4.0
Exercisable at the end of the period (in years)					3.3
Aggregate Intrinsic Value
Balance at the beginning of the period				696,371,000	696,371,000
Balance at the end of the period	572,530,000				572,530,000	696,371,000
Vested and expected to vest in the future at the end of the period	562,816,000				562,816,000
Exercisable at the end of the period	$ 492,022,000				$ 492,022,000