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Cost-Saving Initiatives - Expenses Associated with Cost Savings Initiatives (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Cost Saving initiatives [Line Items]    
Restructuring charges   $ 200,004
Severance and other employee termination expenses (included in "compensation and benefits" expense)    
Cost Saving initiatives [Line Items]    
Restructuring charges   182,103
Technology asset impairments (included in "technology and information services")    
Cost Saving initiatives [Line Items]    
Restructuring charges   8,021
Foreign exchange related losses associated with closing of certain offices (included in "revenue-other")    
Cost Saving initiatives [Line Items]    
Restructuring charges   4,878
Other    
Cost Saving initiatives [Line Items]    
Restructuring charges   5,002
Compensation and Benefits Expense | Forecast    
Cost Saving initiatives [Line Items]    
Restructuring charges $ 40,000  
Operating Segments | Financial Advisory    
Cost Saving initiatives [Line Items]    
Restructuring charges   102,428
Operating Segments | Financial Advisory | Severance and other employee termination expenses (included in "compensation and benefits" expense)    
Cost Saving initiatives [Line Items]    
Restructuring charges   98,219
Operating Segments | Financial Advisory | Technology asset impairments (included in "technology and information services")    
Cost Saving initiatives [Line Items]    
Restructuring charges   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   1,824
Operating Segments | Financial Advisory | Other    
Cost Saving initiatives [Line Items]    
Restructuring charges   2,241
Operating Segments | Asset Management    
Cost Saving initiatives [Line Items]    
Restructuring charges   57,499
Operating Segments | Asset Management | Severance and other employee termination expenses (included in "compensation and benefits" expense)    
Cost Saving initiatives [Line Items]    
Restructuring charges   49,152
Operating Segments | Asset Management | Technology asset impairments (included in "technology and information services")    
Cost Saving initiatives [Line Items]    
Restructuring charges   7,877
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
Operating Segments | Asset Management | Other    
Cost Saving initiatives [Line Items]    
Restructuring charges   470
Corporate    
Cost Saving initiatives [Line Items]    
Restructuring charges   40,077
Corporate | Severance and other employee termination expenses (included in "compensation and benefits" expense)    
Cost Saving initiatives [Line Items]    
Restructuring charges   34,732
Corporate | Technology asset impairments (included in "technology and information services")    
Cost Saving initiatives [Line Items]    
Restructuring charges   0
Corporate | Foreign exchange related losses associated with closing of certain offices (included in "revenue-other")    
Cost Saving initiatives [Line Items]    
Restructuring charges   3,054
Corporate | Other    
Cost Saving initiatives [Line Items]    
Restructuring charges   $ 2,291