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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Goodwill [Roll Forward]      
Beginning balance $ 377,240 $ 379,421 $ 383,861
Acquisition of business 16,729 0 0
Foreign currency translation adjustments 929 (2,181) (4,440)
Ending balance 394,898 377,240 379,421
Financial Advisory      
Goodwill [Roll Forward]      
Beginning balance 312,699 314,880 319,320
Acquisition of business 0 0 0
Foreign currency translation adjustments 929 (2,181) (4,440)
Ending balance 313,628 312,699 314,880
Asset Management      
Goodwill [Roll Forward]      
Beginning balance 64,541 64,541 64,541
Acquisition of business 16,729 0 0
Foreign currency translation adjustments 0 0 0
Ending balance $ 81,270 $ 64,541 $ 64,541