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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

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