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Goodwill and Intangible Assets - Summary of Changes in Carrying Amounts of Goodwill by Operating Segment (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Goodwill [Roll Forward] |  |  |
Goodwill beginning of period | $ 1,227,593,000 | $ 1,232,791,000 |
Acquisitions |  | 11,332,000 |
Foreign currency translation adjustment | 6,976,000 | (16,530,000) |
Intersegment transfers in/(out) | 0 |  |
Goodwill end of period | 1,234,569,000 | 1,227,593,000 |
Corporate Finance |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill beginning of period | 516,500,000 | 501,046,000 |
Acquisitions |  | 11,332,000 |
Foreign currency translation adjustment | 1,405,000 | 4,122,000 |
Intersegment transfers in/(out) | 23,086,000 |  |
Goodwill end of period | 540,991,000 | 516,500,000 |
Accumulated impairment loss | 0 | 0 | $ 0
FLC |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill beginning of period | 234,872,000 | 237,929,000 |
Acquisitions |  | 0 |
Foreign currency translation adjustment | 1,629,000 | (3,057,000) |
Intersegment transfers in/(out) | (23,086,000) |  |
Goodwill end of period | 213,415,000 | 234,872,000 |
Accumulated impairment loss | 0 | 0 | 0
Economic Consulting |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill beginning of period | 268,055,000 | 268,858,000 |
Acquisitions |  | 0 |
Foreign currency translation adjustment | 427,000 | (803,000) |
Intersegment transfers in/(out) | 0 |  |
Goodwill end of period | 268,482,000 | 268,055,000 |
Accumulated impairment loss | 0 | 0 | 0
Technology |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill beginning of period | 96,727,000 | 96,811,000 |
Acquisitions |  | 0 |
Foreign currency translation adjustment | 75,000 | (84,000) |
Intersegment transfers in/(out) | 0 |  |
Goodwill end of period | 96,802,000 | 96,727,000 |
Accumulated impairment loss | 0 | 0 | 0
Strategic Communications |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill beginning of period | 111,439,000 | 128,147,000 |
Acquisitions |  | 0 |
Foreign currency translation adjustment | 3,440,000 | (16,708,000) |
Intersegment transfers in/(out) | 0 |  |
Goodwill end of period | 114,879,000 | 111,439,000 |
Accumulated impairment loss | 194,100,000 | 194,100,000 | 194,100,000
Goodwill | $ 309,000,000 | $ 305,600,000 | $ 322,300,000

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