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Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2023 | Dec. 31, 2022
Goodwill [Roll Forward] |  |
Goodwill beginning of period | $ 1,227,593,000 |
Foreign currency translation adjustment and other | 4,176,000 |
Goodwill end of period | 1,231,769,000 |
Corporate Finance & Restructuring |  |
Goodwill [Roll Forward] |  |
Goodwill beginning of period | 516,500,000 |
Foreign currency translation adjustment and other | (282,000) |
Goodwill end of period | 516,218,000 |
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 | 1,332,000 |
Goodwill end of period | 236,204,000 |
Accumulated impairment loss | 0 | 0
Economic Consulting |  |
Goodwill [Roll Forward] |  |
Goodwill beginning of period | 268,055,000 |
Foreign currency translation adjustment and other | 262,000 |
Goodwill end of period | 268,317,000 |
Accumulated impairment loss | 0 | 0
Technology |  |
Goodwill [Roll Forward] |  |
Goodwill beginning of period | 96,727,000 |
Foreign currency translation adjustment and other | 63,000 |
Goodwill end of period | 96,790,000 |
Accumulated impairment loss | 0 | 0
Strategic Communications |  |
Goodwill [Roll Forward] |  |
Goodwill beginning of period | 111,439,000 |
Foreign currency translation adjustment and other | 2,801,000 |
Goodwill end of period | 114,240,000 |
Accumulated impairment loss | 194,100,000 | 194,100,000
Goodwill | $ 308,300,000 | $ 305,600,000

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