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Summary of Changes in Carrying Amounts of Goodwill by Operating Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  | $ 1,374,140 | $ 1,392,437 | $ 1,405,828
Accumulated goodwill impairment |  | (194,139) | (194,139) | (194,139)
Goodwill, net |  | 1,180,001 | 1,198,298 | 1,211,689
Acquisitions | [1] | 218 | 70 |
Foreign currency translation adjustment and other |  | (18,515) | (13,461) |
Corporate Finance & Restructuring |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  | 440,666 | 441,548 | 446,066
Goodwill, net |  | 440,666 | 441,548 | 446,066
Acquisitions | [1] |  | 70 |
Foreign currency translation adjustment and other |  | (882) | (4,588) |
Forensic and Litigation Consulting |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  | 230,544 | 235,211 | 238,173
Goodwill, net |  | 230,544 | 235,211 | 238,173
Foreign currency translation adjustment and other |  | (4,667) | (2,962) |
Economic Consulting |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  | 268,209 | 269,341 | 269,897
Goodwill, net |  | 268,209 | 269,341 | 269,897
Foreign currency translation adjustment and other |  | (1,132) | (556) |
Technology |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  | 117,607 | 117,888 | 117,967
Goodwill, net |  | 117,607 | 117,888 | 117,967
Foreign currency translation adjustment and other |  | (281) | (79) |
Strategic Communications |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  | 317,114 | 328,449 | 333,725
Accumulated goodwill impairment |  | (194,139) | (194,139) | (194,139)
Goodwill, net |  | 122,975 | 134,310 | $ 139,586
Acquisitions | [1] | 218 |  |
Foreign currency translation adjustment and other |  | $ (11,553) | $ (5,276) |
[1] | Includes adjustments during the purchase price allocation period.

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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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