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COST-SAVING INITIATIVES - Expenses Associated with Cost Savings Initiatives (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Cost Saving initiatives [Line Items]    
Restructuring charges $ 15,707 $ 183,152
Severance and other employee termination expenses (included in "compensation and benefits" expense)    
Cost Saving initiatives [Line Items]    
Restructuring charges 8,941 166,289
Technology asset impairments (included in "technology and information services")    
Cost Saving initiatives [Line Items]    
Restructuring charges 571 7,956
Foreign exchange related losses associated with closing of certain offices (included in "revenue-other")    
Cost Saving initiatives [Line Items]    
Restructuring charges 4,647 4,647
Other    
Cost Saving initiatives [Line Items]    
Restructuring charges 1,548 4,260
Operating Segments | Financial Advisory    
Cost Saving initiatives [Line Items]    
Restructuring charges 3,677 94,330
Operating Segments | Financial Advisory | Severance and other employee termination expenses (included in "compensation and benefits" expense)    
Cost Saving initiatives [Line Items]    
Restructuring charges (21) 90,022
Operating Segments | Financial Advisory | Technology asset impairments (included in "technology and information services")    
Cost Saving initiatives [Line Items]    
Restructuring charges 56 144
Operating Segments | Financial Advisory | Foreign exchange related losses associated with closing of certain offices (included in "revenue-other")    
Cost Saving initiatives [Line Items]    
Restructuring charges 2,164 2,164
Operating Segments | Financial Advisory | Other    
Cost Saving initiatives [Line Items]    
Restructuring charges 1,478 2,000
Operating Segments | Asset Management    
Cost Saving initiatives [Line Items]    
Restructuring charges 4,733 53,078
Operating Segments | Asset Management | Severance and other employee termination expenses (included in "compensation and benefits" expense)    
Cost Saving initiatives [Line Items]    
Restructuring charges 4,190 44,958
Operating Segments | Asset Management | Technology asset impairments (included in "technology and information services")    
Cost Saving initiatives [Line Items]    
Restructuring charges 515 7,812
Operating Segments | Asset Management | Foreign exchange related losses associated with closing of certain offices (included in "revenue-other")    
Cost Saving initiatives [Line Items]    
Restructuring charges 0 0
Operating Segments | Asset Management | Other    
Cost Saving initiatives [Line Items]    
Restructuring charges 28 308
Corporate    
Cost Saving initiatives [Line Items]    
Restructuring charges 7,297 35,744
Corporate | Severance and other employee termination expenses (included in "compensation and benefits" expense)    
Cost Saving initiatives [Line Items]    
Restructuring charges 4,772 31,309
Corporate | Technology asset impairments (included in "technology and information services")    
Cost Saving initiatives [Line Items]    
Restructuring charges 0 0
Corporate | Foreign exchange related losses associated with closing of certain offices (included in "revenue-other")    
Cost Saving initiatives [Line Items]    
Restructuring charges 2,483 2,483
Corporate | Other    
Cost Saving initiatives [Line Items]    
Restructuring charges $ 42 $ 1,952