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GOODWILL AND OTHER INTANGIBLE ASSETS - Additional information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 502,341 |  | $ 502,341 |  | $ 472,326
Acquisition of other businesses |  |  | 57,459 |  |
Goodwill impairment | 26,681 |  | 26,681 |  |
Other |  |  | (763) |  |
Amortization expense | 9,298 | $ 10,103 | 18,294 | $ 20,576 |
Estimated future amortization expense remainder of fiscal year | 16,728 |  | 16,728 |  |
Estimated future amortization expense year one | 32,066 |  | 32,066 |  |
Estimated future amortization expense year two | 28,939 |  | 28,939 |  |
Estimated future amortization expense year three | 26,694 |  | 26,694 |  |
Estimated future amortization expense year four | 23,188 |  | 23,188 |  |
Estimated future amortization expense after year four | 47,929 |  | 47,929 |  |
Impairment of goodwill and tradenames | 27,681 | $ 1,733 | 27,681 | $ 1,733 |
Goodwill, fair value disclosure | $ 0 |  | $ 0 |  |
Measurement Input, Growth Rate |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Reporting unit, measurement input | 0.04 |  | 0.04 |  |
Measurement Input, Discount Rate |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Reporting unit, measurement input | 0.16 |  | 0.16 |  |
Measurement Input, Royalty Rate |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Reporting unit, measurement input | 0.02 |  | 0.02 |  |
Tradenames |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Impairment of intangible assets (excluding goodwill) | $ 1,000 |  | $ 1,000 |  |
Indefinite-lived intangible assets (excluding goodwill), fair value disclosure | 18,500 |  | 18,500 |  |
All Other |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 59,308 |  | 59,308 |  | 3,280
Acquisition of other businesses |  |  | 56,028 |  |
Goodwill impairment |  |  | 0 |  |
Other |  |  | 0 |  |
Operating Segments | Financial Consulting Segment |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 34,510 |  | 34,510 |  | 33,310
Acquisition of other businesses |  |  | 1,431 |  |
Goodwill impairment |  |  | 0 |  |
Other |  |  | (231) |  |
Operating Segments | Capital Markets Segment |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 161,486 |  | 161,486 |  | $ 162,018
Acquisition of other businesses |  |  | 0 |  |
Goodwill impairment |  |  | 0 |  |
Other |  |  | $ (532) |  |

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