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Goodwill and Other Intangible Assets - Summary of Changes in Carrying Amounts of Goodwill by Operating Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Roll Forward] |  |  |
Goodwill | $ 1,398,942 | $ 1,374,140 |
Accumulated goodwill impairment | (194,139) | (194,139) |
Goodwill beginning of period | 1,204,803 | 1,180,001 |
Sale of business | (20,928) |  |
Acquisitions |  | 11,900 |
Foreign currency translation adjustment and other | (11,559) | 12,902 |
Goodwill | 1,366,455 | 1,398,942 | $ 1,374,140
Accumulated goodwill impairment | (194,139) | (194,139) | (194,139)
Goodwill end of period | 1,172,316 | 1,204,803 | 1,180,001
Proceeds from sale of business | 50,283 | 0 | 0
Corporate Finance |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill | 454,816 | 440,666 |
Goodwill beginning of period | 454,816 | 440,666 |
Acquisitions |  | 11,900 |
Foreign currency translation adjustment and other | (3,819) | 2,250 |
Goodwill | 450,997 | 454,816 | 440,666
Goodwill end of period | 450,997 | 454,816 | 440,666
Forensic and Litigation Consulting |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill | 233,719 | 230,544 |
Goodwill beginning of period | 233,719 | 230,544 |
Foreign currency translation adjustment and other | (2,182) | 3,175 |
Goodwill | 231,537 | 233,719 | 230,544
Goodwill end of period | 231,537 | 233,719 | 230,544
Economic Consulting |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill | 268,995 | 268,209 |
Goodwill beginning of period | 268,995 | 268,209 |
Foreign currency translation adjustment and other | (448) | 786 |
Goodwill | 268,547 | 268,995 | 268,209
Goodwill end of period | 268,547 | 268,995 | 268,209
Technology |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill | 117,740 | 117,607 |
Goodwill beginning of period | 117,740 | 117,607 |
Sale of business | (20,928) |  |
Acquisitions | 20,900 |  |
Foreign currency translation adjustment and other | (89) | 133 |
Goodwill | 96,723 | 117,740 | 117,607
Goodwill end of period | 96,723 | 117,740 | 117,607
Proceeds from sale of business | 50,300 | 8,900 |
Strategic Communications |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill | 323,672 | 317,114 |
Accumulated goodwill impairment | (194,139) | (194,139) |
Goodwill beginning of period | 129,533 | 122,975 |
Foreign currency translation adjustment and other | (5,021) | 6,558 |
Goodwill | 318,651 | 323,672 | 317,114
Accumulated goodwill impairment | (194,139) | (194,139) | (194,139)
Goodwill end of period | $ 124,512 | 129,533 | $ 122,975
Restructuring Business | Technology |  |  |
Goodwill [Roll Forward] |  |  |
Sale of business |  | $ (11,900) |

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