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Cost-Saving Initiatives - Expenses Associated with Cost Savings Initiatives (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cost Saving initiatives [Line Items]      
Restructuring costs $ 48,729 $ 200,004  
Severance and other employee termination expenses (included in "compensation and benefits" expense)      
Cost Saving initiatives [Line Items]      
Restructuring costs 46,610 182,103  
Technology asset impairments (included in "technology and information services")      
Cost Saving initiatives [Line Items]      
Restructuring costs   8,021  
Foreign exchange related losses associated with closing of certain offices (included in "revenue-other")      
Cost Saving initiatives [Line Items]      
Restructuring costs 587 4,878 $ 0
Other      
Cost Saving initiatives [Line Items]      
Restructuring costs 2,119 5,002  
Financial Advisory      
Cost Saving initiatives [Line Items]      
Restructuring costs 33,481 102,428  
Financial Advisory | Severance and other employee termination expenses (included in "compensation and benefits" expense)      
Cost Saving initiatives [Line Items]      
Restructuring costs 32,773 98,219  
Financial Advisory | Technology asset impairments (included in "technology and information services")      
Cost Saving initiatives [Line Items]      
Restructuring costs   144  
Financial Advisory | Foreign exchange related losses associated with closing of certain offices (included in "revenue-other")      
Cost Saving initiatives [Line Items]      
Restructuring costs   1,824  
Financial Advisory | Other      
Cost Saving initiatives [Line Items]      
Restructuring costs 708 2,241  
Asset Management      
Cost Saving initiatives [Line Items]      
Restructuring costs 11,559 57,499  
Asset Management | Severance and other employee termination expenses (included in "compensation and benefits" expense)      
Cost Saving initiatives [Line Items]      
Restructuring costs 11,545 49,152  
Asset Management | Technology asset impairments (included in "technology and information services")      
Cost Saving initiatives [Line Items]      
Restructuring costs   7,877  
Asset Management | Foreign exchange related losses associated with closing of certain offices (included in "revenue-other")      
Cost Saving initiatives [Line Items]      
Restructuring costs   0  
Asset Management | Other      
Cost Saving initiatives [Line Items]      
Restructuring costs 14 470  
Corporate      
Cost Saving initiatives [Line Items]      
Restructuring costs 3,689 40,077  
Corporate | Severance and other employee termination expenses (included in "compensation and benefits" expense)      
Cost Saving initiatives [Line Items]      
Restructuring costs 2,292 34,732  
Corporate | Technology asset impairments (included in "technology and information services")      
Cost Saving initiatives [Line Items]      
Restructuring costs   0  
Corporate | Foreign exchange related losses associated with closing of certain offices (included in "revenue-other")      
Cost Saving initiatives [Line Items]      
Restructuring costs   3,054  
Corporate | Other      
Cost Saving initiatives [Line Items]      
Restructuring costs $ 1,397 $ 2,291