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EQUITY AND SHARE-BASED COMPENSATION (Details) (USD $)
1 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 38 Months Ended 6 Months Ended
Mar. 31, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
May 07, 2013
Dec. 31, 2012
Jun. 30, 2013
Minimum
Jun. 30, 2013
Maximum
Jun. 30, 2013
Black-Scholes
Jun. 30, 2012
Black-Scholes
Jun. 30, 2013
Black-Scholes
Minimum
Jun. 30, 2012
Black-Scholes
Minimum
Jun. 30, 2013
Black-Scholes
Maximum
Jun. 30, 2012
Black-Scholes
Maximum
Jun. 30, 2013
Binomial
Jun. 30, 2012
Binomial
Jun. 30, 2013
Binomial
Minimum
Jun. 30, 2012
Binomial
Minimum
Jun. 30, 2013
Binomial
Maximum
Jun. 30, 2012
Binomial
Maximum
Jun. 30, 2013
Stock Repurchase Programs
Jun. 30, 2012
Stock Repurchase Programs
Jun. 30, 2013
Stock Repurchase Programs
Jun. 30, 2012
Stock Repurchase Programs
Jun. 30, 2013
Stock Repurchase Programs
May 31, 2012
2012 Stock Repurchase Program
Maximum
Jun. 30, 2013
Service-based Options
Jun. 30, 2013
Market-based Options
item
Jun. 30, 2013
Ordinary performance grants
Jun. 30, 2013
Ordinary performance grants
Minimum
item
Jun. 30, 2013
Extraordinary performance grants
Jun. 30, 2013
Extraordinary performance grants
Minimum
item
Stock Repurchase Plan                                                                  
Number of shares of common stock authorized to be purchased                                                     3,500,000            
Number of shares of common stock purchased                                           300,000 0 600,000 300,000 3,100,000              
Average purchase price per share (in dollars per share)                                           $ 94.49   $ 89.01 $ 63.25 $ 47.04              
Remaining number of shares available for repurchase under the plan                                           2,900,000   2,900,000   2,900,000              
Amount available to repurchase common stock under Luxembourg law (in dollars)                                           $ 40,000,000   $ 40,000,000   $ 40,000,000              
Senior secured term loan   398,500,000   398,500,000   400,000,000 200,000,000                                                    
Capacity available to repurchase common stock under senior secured term loan (in dollars)                                           80,000,000   80,000,000   80,000,000              
EQUITY AND SHARE-BASED COMPENSATION                                                                  
Share-based compensation expense (in dollars)   100,000 1,100,000 1,500,000 900,000                                                        
Reversal of share-based compensation expense (in dollars) 800,000                                                                
Vesting period                                                       4 years          
Expiration term                                                       10 years          
Outstanding (in shares)   2,857,457   2,857,457     3,058,309                                         900,000 2,000,000        
Number of components of an award                                                         2        
Market-based options subject to specified performance achievement (as a percent)                                                           0.67   0.33  
Percentage of compounded annual gain of stock price over exercise price required for the award to vest                                                             20.00%   25.00%
Vesting percentage for awards that vest upon achievement of certain criteria                                                         25.00%        
Cumulative vesting percentage for awards that vest in equal annual installments                                                         75.00%        
Number of equal annual installments for vesting of award                                                         3        
Stock options granted (in shares)       45,000 200,000                                                        
Weighted average exercise price of stock options granted (in dollars per share)       $ 90.75 $ 63.14                                                        
Multiplier of stock price over exercise price as a condition for the award to vest                                                             2   3
Assumptions used to determine the fair value of options as of the grant date                                                                  
Risk-free interest rate, minimum (as a percent)                   1.02% 0.97%         0.01% 0.08%                                
Risk-free interest rate, maximum (as a percent)                   1.13% 1.17%         2.02% 2.04%                                
Expected stock price volatility, minimum (as a percent)                   36.35% 34.22%         36.40% 34.20%                                
Expected stock price volatility, maximum (as a percent)                   36.76% 34.65%         36.80% 34.60%                                
Expected option life                   6 years 3 months 6 years 3 months                                            
Contractual life                               14 years 14 years                                
Fair value (in dollars per share)       $ 25.83 $ 16.86             $ 31.33 $ 19.25 $ 35.77 $ 22.80     $ 16.12 $ 11.65 $ 31.15 $ 17.27                        
Weighted-average fair value of stock options granted and total intrinsic value of stock options exercised                                                                  
Weighted-average fair value at grant date per share (in dollars per share)       $ 25.83 $ 16.86             $ 31.33 $ 19.25 $ 35.77 $ 22.80     $ 16.12 $ 11.65 $ 31.15 $ 17.27                        
Intrinsic value of options exercised (in dollars)       9,625,000 8,339,000                                                        
Fair value of options vested (in dollars)       1,475,000 973,000                                                        
Estimated forfeiture rate (as a percent)               1.00% 10.00%                                                
Estimated unrecognized compensation costs (in dollars)   $ 2,700,000   $ 2,700,000                                                          
Weighted-average remaining requisite service period for stock options over which unrecognized compensation costs would be recognized       2 years 7 months 6 days