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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 |

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