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STOCK-BASED COMPENSATION (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Stock-based compensation      
Stock-based compensation plans 2    
Compensation expense on share-based plans $ 7,000,000 $ 7,000,000  
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 2,600,000 200,000  
Weighted-average assumptions used to estimate the fair value of options granted      
Dividend yield (as a percent) 0.00% 0.00%  
Expected volatility (as a percent) 43.10% 47.80%  
Risk-free interest rate (as a percent) 1.60% 0.90%  
Expected term 5 years 10 months 24 days 5 years 4 months 24 days  
Stock Options, Number of Shares      
Balance at the beginning of the period (in shares) 12,973    
Granted (in shares) 689    
Exercised (in shares) (235)    
Cancelled or forfeited (in shares) (16)    
Balance at the end of the period (in shares) 13,411   12,973
Vested and expected to vest in the future at the end of the period (in shares) 12,905    
Exercisable at the end of the period (in shares) 10,323    
Stock options, Weighted-Average Exercise Price Per Share      
Balance at the beginning of the period (in dollars per share) $ 15.70    
Granted (in dollars per share) $ 70.06    
Exercised (in dollars per share) $ 24.33    
Cancelled or forfeited (in dollars per share) $ 47.09    
Balance at the end of the period (in dollars per share) $ 18.30   $ 15.70
Vested and expected to vest in the future at the end of the period (in dollars per share) $ 16.92    
Exercisable at the end of the period (in dollars per share) $ 9.45    
Weighted-Average Remaining Contractual Term      
Balance at the beginning of the period 3 years 9 months 18 days   3 years 8 months 12 days
Balance at the end of the period 3 years 9 months 18 days   3 years 8 months 12 days
Vested and expected to vest in the future at the end of the period 3 years 7 months 6 days    
Exercisable at the end of the period 2 years 4 months 24 days    
Aggregate Intrinsic Value      
Balance at the beginning of the period 675,595,000    
Balance at the end of the period 686,398,000   675,595,000
Vested and expected to vest in the future at the end of the period 678,326,000    
Exercisable at the end of the period $ 619,368,000