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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 |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Goodwill [Roll Forward] |  |
Goodwill | $ 1,402,150 | $ 1,398,942
Accumulated goodwill impairment | (194,139) | (194,139)
Goodwill beginning of period | 1,204,803 |
Foreign currency translation adjustment and other | 3,208 |
Goodwill end of period | 1,208,011 |
Corporate Finance & Restructuring |  |
Goodwill [Roll Forward] |  |
Goodwill | 453,914 | 454,816
Goodwill beginning of period | 454,816 |
Foreign currency translation adjustment and other | (902) |
Goodwill end of period | 453,914 |
Forensic and Litigation Consulting |  |
Goodwill [Roll Forward] |  |
Goodwill | 234,963 | 233,719
Goodwill beginning of period | 233,719 |
Foreign currency translation adjustment and other | 1,244 |
Goodwill end of period | 234,963 |
Economic Consulting |  |
Goodwill [Roll Forward] |  |
Goodwill | 269,289 | 268,995
Goodwill beginning of period | 268,995 |
Foreign currency translation adjustment and other | 294 |
Goodwill end of period | 269,289 |
Technology |  |
Goodwill [Roll Forward] |  |
Goodwill | 117,800 | 117,740
Goodwill beginning of period | 117,740 |
Foreign currency translation adjustment and other | 60 |
Goodwill end of period | 117,800 |
Strategic Communications |  |
Goodwill [Roll Forward] |  |
Goodwill | 326,184 | 323,672
Accumulated goodwill impairment | (194,139) | $ (194,139)
Goodwill beginning of period | 129,533 |
Foreign currency translation adjustment and other | 2,512 |
Goodwill end of period | $ 132,045 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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