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Goodwill and Other Intangible Assets - Summary of Changes in Carrying Amounts of Goodwill by Operating Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Roll Forward] |  |  |  |
Goodwill |  | $ 1,366,455 | $ 1,398,942 |
Accumulated goodwill impairment |  | (194,139) | (194,139) |
Goodwill beginning of period |  | 1,172,316 | 1,204,803 |
Sale of business |  |  | (20,928) |
Acquisitions |  | 27,389 |  |
Foreign currency translation adjustment and other |  | 3,062 | (11,559) |
Goodwill | $ 1,396,906 | 1,396,906 | 1,366,455 | $ 1,398,942
Accumulated goodwill impairment | (194,139) | (194,139) | (194,139) | (194,139)
Goodwill end of period | 1,202,767 | 1,202,767 | 1,172,316 | 1,204,803
Proceeds from sale of business |  | 0 | 50,283 | 0
Corporate Finance |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill |  | 450,997 | 454,816 |
Accumulated goodwill impairment |  | 0 | 0 |
Goodwill beginning of period |  | 450,997 | 454,816 |
Sale of business |  |  | 0 |
Acquisitions |  | 27,389 |  |
Foreign currency translation adjustment and other |  | 456 | (3,819) |
Goodwill | 478,842 | 478,842 | 450,997 | 454,816
Accumulated goodwill impairment | 0 | 0 | 0 | 0
Goodwill end of period | 478,842 | 478,842 | 450,997 | 454,816
Forensic and Litigation Consulting |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill |  | 231,537 | 233,719 |
Accumulated goodwill impairment |  | 0 | 0 |
Goodwill beginning of period |  | 231,537 | 233,719 |
Sale of business |  |  | 0 |
Acquisitions |  | 0 |  |
Foreign currency translation adjustment and other |  | 583 | (2,182) |
Goodwill | 232,120 | 232,120 | 231,537 | 233,719
Accumulated goodwill impairment | 0 | 0 | 0 | 0
Goodwill end of period | 232,120 | 232,120 | 231,537 | 233,719
Economic Consulting |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill |  | 268,547 | 268,995 |
Accumulated goodwill impairment |  | 0 | 0 |
Goodwill beginning of period |  | 268,547 | 268,995 |
Sale of business |  |  | 0 |
Acquisitions |  | 0 |  |
Foreign currency translation adjustment and other |  | 130 | (448) |
Goodwill | 268,677 | 268,677 | 268,547 | 268,995
Accumulated goodwill impairment | 0 | 0 | 0 | 0
Goodwill end of period | 268,677 | 268,677 | 268,547 | 268,995
Technology |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill |  | 96,723 | 117,740 |
Accumulated goodwill impairment |  | 0 | 0 |
Goodwill beginning of period |  | 96,723 | 117,740 |
Sale of business |  |  | (20,928) |
Acquisitions |  | 0 |  |
Foreign currency translation adjustment and other |  | 47 | (89) |
Goodwill | 96,770 | 96,770 | 96,723 | 117,740
Accumulated goodwill impairment | 0 | 0 | 0 | 0
Goodwill end of period | 96,770 | 96,770 | 96,723 | 117,740
Proceeds from sale of business |  |  | 50,300 |
Strategic Communications |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill |  | 318,651 | 323,672 |
Accumulated goodwill impairment |  | (194,139) | (194,139) |
Goodwill beginning of period |  | 124,512 | 129,533 |
Sale of business |  |  | 0 |
Acquisitions |  | 0 |  |
Foreign currency translation adjustment and other |  | 1,846 | (5,021) |
Goodwill | 320,497 | 320,497 | 318,651 | 323,672
Accumulated goodwill impairment | (194,139) | (194,139) | (194,139) | (194,139)
Goodwill end of period | 126,358 | $ 126,358 | $ 124,512 | $ 129,533
Andersch AG |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Acquisitions | $ 27,400 |  |  |

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