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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

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