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Changes in Carrying Amounts of Goodwill by Operating Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  | $ 1,392,437 | $ 1,405,828 | $ 1,412,872
Accumulated goodwill impairment |  | (194,139) | (194,139) | (194,139)
Goodwill, net |  | 1,198,298 | 1,211,689 | 1,218,733
Acquisitions | [1] | 70 | 6,926 |
Foreign currency translation adjustment and other |  | (13,461) | (13,970) |
Corporate Finance / Restructuring |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  | 441,548 | 446,066 | 449,710
Goodwill, net |  | 441,548 | 446,066 | 449,710
Acquisitions | [1] | 70 |  |
Foreign currency translation adjustment and other |  | (4,588) | (3,644) |
Forensic and Litigation Consulting |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  | 235,211 | 238,173 | 241,651
Goodwill, net |  | 235,211 | 238,173 | 241,651
Acquisitions | [1] |  | (224) |
Foreign currency translation adjustment and other |  | (2,962) | (3,254) |
Economic Consulting |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  | 269,341 | 269,897 | 263,474
Goodwill, net |  | 269,341 | 269,897 | 263,474
Acquisitions | [1] |  | 7,150 |
Foreign currency translation adjustment and other |  | (556) | (727) |
Technology |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  | 117,888 | 117,967 | 118,073
Goodwill, net |  | 117,888 | 117,967 | 118,073
Foreign currency translation adjustment and other |  | (79) | (106) |
Strategic Communications |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  | 328,449 | 333,725 | 339,964
Accumulated goodwill impairment |  | (194,139) | (194,139) | (194,139)
Goodwill, net |  | 134,310 | 139,586 | $ 145,825
Foreign currency translation adjustment and other |  | $ (5,276) | $ (6,239) |
[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 -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 + Details
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