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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Roll Forward] |  |  |
Goodwill | $ 1,398,942 | $ 1,374,140 | $ 1,392,437
Accumulated goodwill impairment | (194,139) | (194,139) | (194,139)
Goodwill beginning of period | 1,180,001 | 1,198,298 |
Acquisitions | 11,900 | 218 |
Foreign currency translation adjustment and other | 12,902 | (18,515) |
Goodwill end of period | 1,204,803 | 1,180,001 |
Corporate Finance & Restructuring |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill | 454,816 | 440,666 | 441,548
Goodwill beginning of period | 440,666 | 441,548 |
Acquisitions | 11,900 |  |
Foreign currency translation adjustment and other | 2,250 | (882) |
Goodwill end of period | 454,816 | 440,666 |
Forensic and Litigation Consulting |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill | 233,719 | 230,544 | 235,211
Goodwill beginning of period | 230,544 | 235,211 |
Foreign currency translation adjustment and other | 3,175 | (4,667) |
Goodwill end of period | 233,719 | 230,544 |
Economic Consulting |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill | 268,995 | 268,209 | 269,341
Goodwill beginning of period | 268,209 | 269,341 |
Foreign currency translation adjustment and other | 786 | (1,132) |
Goodwill end of period | 268,995 | 268,209 |
Technology |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill | 117,740 | 117,607 | 117,888
Goodwill beginning of period | 117,607 | 117,888 |
Foreign currency translation adjustment and other | 133 | (281) |
Goodwill end of period | 117,740 | 117,607 |
Strategic Communications |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill | 323,672 | 317,114 | 328,449
Accumulated goodwill impairment | (194,139) | (194,139) | $ (194,139)
Goodwill beginning of period | 122,975 | 134,310 |
Acquisitions | 0 | 218 |
Foreign currency translation adjustment and other | 6,558 | (11,553) |
Goodwill end of period | 129,533 | $ 122,975 |
Restructuring Business |  |  |
Goodwill [Roll Forward] |  |  |
Initial payment | 8,900 |  |
Restructuring Business | Corporate Finance & Restructuring |  |  |
Goodwill [Roll Forward] |  |  |
Acquisitions | $ 11,900 |  |

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