STOCK-BASED COMPENSATION (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012 Y	Jun. 30, 2012	Mar. 31, 2012 Y	Sep. 30, 2011 Y	Sep. 30, 2012 Y	Sep. 30, 2011 Y
STOCK-BASED COMPENSATION
Stock-based compensation plans					2
Compensation expense on share-based plans	$ 7,900,000			$ 4,900,000	$ 21,600,000	$ 12,800,000
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	1,400,000			2,200,000	4,300,000	3,400,000
Weighted-average assumptions used to estimate the fair value of options granted
Dividend yield (as a percent)	0.00%			0.00%	0.00%	0.00%
Expected volatility (as a percent)	47.70%			52.70%	47.90%	54.10%
Risk-free interest rate (as a percent)	0.60%			1.30%	0.70%	1.70%
Expected term (in years)	5.4			5.7	5.4	5.9
Stock Options, Number of Shares
Balance at the beginning of the period (in shares)			18,569		18,569
Granted (in shares)	207	65	120
Exercised (in shares)					(3,722)
Cancelled or forfeited (in shares)					(147)
Balance at the end of the period (in shares)	15,092				15,092
Vested and expected to vest in the future at the end of the period (in shares)	14,568				14,568
Exercisable at the end of the period (in shares)	11,627				11,627
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)	$ 57.99	$ 66.43	$ 57.45		$ 57.99
Exercised (in dollars per share)	$ 2.25				$ 2.25
Cancelled or forfeited (in dollars per share)					$ 20.13
Balance at the end of the period (in dollars per share)	$ 11.33				$ 11.33
Vested and expected to vest in the future at the end of the period (in dollars per share)	$ 10.61				$ 10.61
Exercisable at the end of the period (in dollars per share)	$ 7.21				$ 7.21
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
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)					3.2
Aggregate Intrinsic Value
Balance at the beginning of the period			696,371,000		696,371,000
Balance at the end of the period	646,916,000				646,916,000
Vested and expected to vest in the future at the end of the period	634,377,000				634,377,000
Exercisable at the end of the period	$ 544,650,000				$ 544,650,000