v2.4.0.8
Equity-Based Compensation (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Significant assumptions used to develop the fair value estimates of equity-based awards    
Compensation expenses $ 11,010 $ 12,526
Unrecognized compensation expenses 98,305  
Unrecognized compensation expenses to be accelerated on the initial public offering date 87,600  
Unrecognized compensation expenses to be amortized over relevant vesting period after IPO $ 10,705  
Weighted average remaining period for recognition of unrecognized compensation cost 3 years 6 months  
Partners
   
Significant assumptions used to develop the fair value estimates of equity-based awards    
Forfeiture rate (as a percent) 3.00%  
Non-partner employees
   
Significant assumptions used to develop the fair value estimates of equity-based awards    
Forfeiture rate (as a percent) 5.00%