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Equity-Based Compensation (Details 3) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Apr. 30, 2014
Class A common stock
Mar. 31, 2014
Management Units
Mar. 31, 2013
Management Units
Mar. 31, 2014
Rights
Dec. 31, 2013
Rights
Apr. 30, 2014
Rights
Class A common stock
Forecast
Mar. 31, 2014
Rights
Class A common stock
Forecast
Management Units provided to partner and non-partner employees, Units                  
Outstanding at the beginning of the period (in shares)       882,080 855,003 11,832 11,634    
Granted (in shares)       1,609 2,495        
Forfeited (in shares)       (2,895) (1,272)        
Outstanding at the end of the period (in shares)       880,794 856,226 11,832 11,634    
Management Units provided to partner and non-partner employees, Weighted average fair value at grant                  
Outstanding at the beginning of the period (in dollars per share)       $ 270.05 $ 242.55        
Granted (in dollars per share)       $ 1,224.00 $ 791.16        
Forfeited (in dollars per share)       $ 836.19 $ 101.75        
Outstanding at the end of the period (in dollars per share)       $ 269.94 $ 244.72        
Unvested Management Units provided to partner and non-partner employees, Shares                  
Unvested Balance at the beginning of the period (in shares)       452,957          
Granted (in shares)       1,609          
Forfeited (in shares)       (2,894)          
Vested (in shares)       (6,352)          
Unvested Balance at the end of the period (in shares)       445,320          
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)       $ 485.44          
Granted (in dollars per share)       $ 1,224.00          
Forfeited (in dollars per share)       $ 836.19          
Vested (in dollars per share)       $ 501.22          
Unvested Balance at the end of the period (in dollars per share)       $ 485.61          
Stock issued in connection with IPO and settlement of Right     7,475,000         88,802  
Stock issuance expense to be recorded in the second quarter of 2014 $ 11,010 $ 12,526             $ 2,220