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Compensation and Benefits - Components of expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Salaries, incentive compensation and benefits $ 130,831 $ 99,517 $ 385,106 $ 288,186
Restricted share-based award compensation expense 9,598 9,140 29,666 27,392
Long-term incentive compensation awards 11,404 9,140 34,607 27,392
Compensation and benefits 142,235 108,657 419,713 315,578
Deferred Bonus        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long-term cash incentive compensation expense $ 1,806 $ 0 $ 4,941 $ 0