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Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Goodwill [Roll Forward] |  |
Goodwill beginning of period | $ 1,227,593,000 |
Foreign currency translation adjustment and other | (1,237,000) |
Intersegment transfers in/(out) | 0 |
Goodwill end of period | 1,226,356,000 |
Corporate Finance & Restructuring |  |
Goodwill [Roll Forward] |  |
Goodwill beginning of period | 516,500,000 |
Foreign currency translation adjustment and other | (2,523,000) |
Intersegment transfers in/(out) | 23,086,000 |
Goodwill end of period | 537,063,000 |
Accumulated impairment loss | 0 | $ 0
Forensic and Litigation Consulting |  |
Goodwill [Roll Forward] |  |
Goodwill beginning of period | 234,872,000 |
Foreign currency translation adjustment and other | 309,000 |
Intersegment transfers in/(out) | (23,086,000) |
Goodwill end of period | 212,095,000 |
Accumulated impairment loss | 0 | 0
Economic Consulting |  |
Goodwill [Roll Forward] |  |
Goodwill beginning of period | 268,055,000 |
Foreign currency translation adjustment and other | 44,000 |
Intersegment transfers in/(out) | 0 |
Goodwill end of period | 268,099,000 |
Accumulated impairment loss | 0 | 0
Technology |  |
Goodwill [Roll Forward] |  |
Goodwill beginning of period | 96,727,000 |
Foreign currency translation adjustment and other | 18,000 |
Intersegment transfers in/(out) | 0 |
Goodwill end of period | 96,745,000 |
Accumulated impairment loss | 0 | 0
Strategic Communications |  |
Goodwill [Roll Forward] |  |
Goodwill beginning of period | 111,439,000 |
Foreign currency translation adjustment and other | 915,000 |
Intersegment transfers in/(out) | 0 |
Goodwill end of period | 112,354,000 |
Accumulated impairment loss | 194,100,000 | 194,100,000
Goodwill | $ 306,500,000 | $ 305,600,000

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