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STOCK-BASED COMPENSATION (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Stock-based compensation              
Stock-based compensation plans         2    
Compensation expense on share-based plans $ 7,400,000     $ 7,200,000 $ 22,500,000 $ 21,600,000  
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 8,200,000     1,400,000 11,500,000 30,200,000  
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)         42.40% 47.90%  
Risk-free interest rate (as a percent)         1.60% 0.90%  
Expected term         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)     12,973   12,973    
Granted (in shares) 0 104 689 0      
Exercised (in shares)         (686)    
Cancelled or forfeited (in shares)         (106)    
Balance at the end of the period (in shares) 12,974       12,974   12,973
Vested and expected to vest in the future at the end of the period (in shares) 12,574       12,574    
Exercisable at the end of the period (in shares) 10,215       10,215    
Stock options, Weighted-Average Exercise Price Per Share              
Balance at the beginning of the period (in dollars per share)     $ 15.70   $ 15.70    
Granted (in dollars per share)   $ 69.15 $ 70.06        
Exercised (in dollars per share)         $ 21.95    
Cancelled or forfeited (in dollars per share)         $ 45.32    
Balance at the end of the period (in dollars per share) $ 18.44       $ 18.44   $ 15.70
Vested and expected to vest in the future at the end of the period (in dollars per share) $ 17.22       $ 17.22    
Exercisable at the end of the period (in dollars per share) $ 9.90       $ 9.90    
Weighted-Average Remaining Contractual Term              
Balance at the beginning of the period         3 years 3 months 18 days   3 years 8 months 12 days
Balance at the end of the period         3 years 3 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    
Exercisable at the end of the period         2 years    
Aggregate Intrinsic Value              
Balance at the beginning of the period     675,595,000   675,595,000    
Balance at the end of the period 950,080,000       950,080,000   675,595,000
Vested and expected to vest in the future at the end of the period 936,106,000       936,106,000    
Exercisable at the end of the period $ 835,288,000       $ 835,288,000