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COST-SAVING INITIATIVES - Expenses Associated with Cost Savings Initiatives (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2023
Cost Saving initiatives [Line Items]    
Restructuring charges $ 146,705 $ 167,445
Severance and other employee termination costs (included in "compensation and benefits" expense)    
Cost Saving initiatives [Line Items]    
Restructuring charges 136,608 157,348
Technology asset impairments (included in "technology and information services")    
Cost Saving initiatives [Line Items]    
Restructuring charges 7,385 7,385
Other    
Cost Saving initiatives [Line Items]    
Restructuring charges 2,712 2,712
Operating Segments | Financial Advisory    
Cost Saving initiatives [Line Items]    
Restructuring charges 81,876 90,653
Operating Segments | Financial Advisory | Severance and other employee termination costs (included in "compensation and benefits" expense)    
Cost Saving initiatives [Line Items]    
Restructuring charges 81,266 90,043
Operating Segments | Financial Advisory | Technology asset impairments (included in "technology and information services")    
Cost Saving initiatives [Line Items]    
Restructuring charges 88 88
Operating Segments | Financial Advisory | Other    
Cost Saving initiatives [Line Items]    
Restructuring charges 522 522
Operating Segments | Asset Management    
Cost Saving initiatives [Line Items]    
Restructuring charges 37,110 48,345
Operating Segments | Asset Management | Severance and other employee termination costs (included in "compensation and benefits" expense)    
Cost Saving initiatives [Line Items]    
Restructuring charges 29,533 40,768
Operating Segments | Asset Management | Technology asset impairments (included in "technology and information services")    
Cost Saving initiatives [Line Items]    
Restructuring charges 7,297 7,297
Operating Segments | Asset Management | Other    
Cost Saving initiatives [Line Items]    
Restructuring charges 280 280
Corporate    
Cost Saving initiatives [Line Items]    
Restructuring charges 27,719 28,447
Corporate | Severance and other employee termination costs (included in "compensation and benefits" expense)    
Cost Saving initiatives [Line Items]    
Restructuring charges 25,809 26,537
Corporate | Technology asset impairments (included in "technology and information services")    
Cost Saving initiatives [Line Items]    
Restructuring charges 0 0
Corporate | Other    
Cost Saving initiatives [Line Items]    
Restructuring charges $ 1,910 $ 1,910