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EQUITY-BASED COMPENSATION (Details 3) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Unvested Management Units provided to partner and non-partner employees, Weighted Average Grant Date Fair Value      
Compensation expenses $ 48,539 $ 41,224 $ 24,371
Management Units
     
Management Units provided to partner and non-partner employees, Units      
Outstanding at the beginning of the period (in shares) 855,003 801,392 745,152
Granted (in shares) 38,162 61,837 75,569
Forfeited (in shares) (11,085) (8,226) (19,329)
Outstanding at the end of the period (in shares) 882,080 855,003 801,392
Management Units provided to partner and non-partner employees, Weighted average fair value at grant date      
Outstanding at the beginning of the period (in dollars per share) $ 242.55 $ 181.59 $ 115.29
Granted (in dollars per share) $ 1,005.21 $ 1,133.71 $ 824.89
Forfeited (in dollars per share) $ 689.21 $ 1,003.46 $ 143.57
Outstanding at the end of the period (in dollars per share) $ 270.05 $ 242.55 $ 181.59
Unvested Management Units provided to partner and non-partner employees, Shares      
Unvested Balance at the beginning of the period (in shares) 554,522    
Granted (in shares) 38,162    
Forfeited (in shares) (11,085)    
Vested (in shares) (128,642)    
Unvested Balance at the end of the period (in shares) 452,957 554,522  
Unvested Management Units provided to partner and non-partner employees, Weighted Average Grant Date Fair Value      
Unvested Balance at the beginning of the period (in dollars per share) $ 366.26    
Granted (in dollars per share) $ 1,005.21    
Forfeited (in dollars per share) $ 689.21    
Vested (in dollars per share) $ 113.38    
Unvested Balance at the end of the period (in dollars per share) $ 485.44 $ 366.26  
Rights
     
Management Units provided to partner and non-partner employees, Units      
Outstanding at the beginning of the period (in shares) 12,094 12,765  
Outstanding at the end of the period (in shares) 11,634 12,094 12,765
Unvested Management Units provided to partner and non-partner employees, Weighted Average Grant Date Fair Value      
Compensation expenses $ 0 $ 0 $ 0