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Summary of Changes in Carrying Amounts of Goodwill by Operating Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Goodwill [Line Items] |  |
Foreign currency translation adjustment and other | $ 3,626 |
Goodwill, Gross | 1,374,140 | $ 1,374,140
Accumulated goodwill impairment | (194,139) | (194,139)
Goodwill, net | 1,183,627 | 1,180,001
Corporate Finance & Restructuring |  |
Goodwill [Line Items] |  |
Foreign currency translation adjustment and other | 1,593 |
Goodwill, Gross | 440,666 | 440,666
Goodwill, net | 442,259 | 440,666
Forensic and Litigation Consulting |  |
Goodwill [Line Items] |  |
Foreign currency translation adjustment and other | 503 |
Goodwill, Gross | 230,544 | 230,544
Goodwill, net | 231,047 | 230,544
Economic Consulting |  |
Goodwill [Line Items] |  |
Foreign currency translation adjustment and other | 104 |
Goodwill, Gross | 268,209 | 268,209
Goodwill, net | 268,313 | 268,209
Technology |  |
Goodwill [Line Items] |  |
Foreign currency translation adjustment and other | 17 |
Goodwill, Gross | 117,607 | 117,607
Goodwill, net | 117,624 | 117,607
Strategic Communications |  |
Goodwill [Line Items] |  |
Foreign currency translation adjustment and other | 1,409 |
Goodwill, Gross | 317,114 | 317,114
Accumulated goodwill impairment | (194,139) | (194,139)
Goodwill, net | $ 124,384 | $ 122,975

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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=64834752&loc=SL49117168-202975 + Details
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