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Compensation and Benefits - Fair value and liability of Class B awards (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation     $ 48,764 $ 600,820
StockBasedAwardPayment 800   4,206  
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost $ 0 $ 0 $ 0 $ 287,292