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Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Goodwill [Roll Forward] |  |  |
Goodwill beginning of period |  | $ 1,234,879,000 |
Acquisitions |  | 5,493,000 |
Foreign currency translation adjustment and other |  | (315,000) |
Goodwill end of period | $ 1,240,057,000 | 1,240,057,000 |
Corporate Finance & Restructuring |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill beginning of period |  | 506,072,000 |
Acquisitions |  | 0 |
Foreign currency translation adjustment and other |  | (1,560,000) |
Goodwill end of period | 504,512,000 | 504,512,000 |
Accumulated impairment loss | 0 | 0 | $ 0
Forensic and Litigation Consulting |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill beginning of period |  | 233,374,000 |
Acquisitions | 5,500,000 | 5,493,000 |
Foreign currency translation adjustment and other |  | 315,000 |
Goodwill end of period | 239,182,000 | 239,182,000 |
Accumulated impairment loss | 0 | 0 | 0
Economic Consulting |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill beginning of period |  | 269,087,000 |
Acquisitions |  | 0 |
Foreign currency translation adjustment and other |  | 38,000 |
Goodwill end of period | 269,125,000 | 269,125,000 |
Accumulated impairment loss | 0 | 0 | 0
Technology |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill beginning of period |  | 96,821,000 |
Acquisitions |  | 0 |
Foreign currency translation adjustment and other |  | 30,000 |
Goodwill end of period | 96,851,000 | 96,851,000 |
Accumulated impairment loss | 0 | 0 | 0
Strategic Communications |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill beginning of period |  | 129,525,000 |
Acquisitions |  | 0 |
Foreign currency translation adjustment and other |  | 862,000 |
Goodwill end of period | 130,387,000 | 130,387,000 |
Accumulated impairment loss | 194,100,000 | 194,100,000 | 194,100,000
Goodwill | $ 324,500,000 | $ 324,500,000 | $ 323,700,000

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