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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, 2024 | Jun. 30, 2023
Cost Saving initiatives [Line Items] |  |  |
Restructuring charges | $ 146,705 | $ 48,729 | $ 167,445
Severance and other employee termination expenses (included in "compensation and benefits" expense) |  |  |
Cost Saving initiatives [Line Items] |  |  |
Restructuring charges | 136,608 | 46,610 | 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 | 2,119 | 2,712
Operating Segments | Financial Advisory |  |  |
Cost Saving initiatives [Line Items] |  |  |
Restructuring charges | 81,876 | 33,481 | 90,653
Operating Segments | Financial Advisory | Severance and other employee termination expenses (included in "compensation and benefits" expense) |  |  |
Cost Saving initiatives [Line Items] |  |  |
Restructuring charges | 81,266 | 32,773 | 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 | 708 | 522
Operating Segments | Asset Management |  |  |
Cost Saving initiatives [Line Items] |  |  |
Restructuring charges | 37,110 | 11,559 | 48,345
Operating Segments | Asset Management | Severance and other employee termination expenses (included in "compensation and benefits" expense) |  |  |
Cost Saving initiatives [Line Items] |  |  |
Restructuring charges | 29,533 | 11,545 | 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 | 14 | 280
Corporate |  |  |
Cost Saving initiatives [Line Items] |  |  |
Restructuring charges | 27,719 | 3,689 | 28,447
Corporate | Severance and other employee termination expenses (included in "compensation and benefits" expense) |  |  |
Cost Saving initiatives [Line Items] |  |  |
Restructuring charges | 25,809 | 2,292 | 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 | $ 1,397 | $ 1,910

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