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Changes in Carrying Amounts of Goodwill by Operating Segment (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Goodwill [Line Items] |  |  |
Beginning Balance | $ 1,218,733 |  |
Acquisitions | 71 | [1] |
Foreign currency translation adjustment and other | 2,514 |  |
Goodwill | 1,415,457 |  | 1,412,872
Accumulated goodwill impairment | (194,139) |  | (194,139)
Ending Balance | 1,221,318 |  |
Corporate Finance / Restructuring |  |  |
Goodwill [Line Items] |  |  |
Beginning Balance | 449,710 |  |
Foreign currency translation adjustment and other | 939 |  |
Goodwill | 450,649 |  | 449,710
Ending Balance | 450,649 |  |
Forensic and Litigation Consulting |  |  |
Goodwill [Line Items] |  |  |
Beginning Balance | 241,651 |  |
Acquisitions | 71 | [1] |
Foreign currency translation adjustment and other | 388 |  |
Goodwill | 242,110 |  | 241,651
Ending Balance | 242,110 |  |
Economic Consulting |  |  |
Goodwill [Line Items] |  |  |
Beginning Balance | 263,474 |  |
Foreign currency translation adjustment and other | 60 |  |
Goodwill | 263,534 |  | 263,474
Ending Balance | 263,534 |  |
Technology |  |  |
Goodwill [Line Items] |  |  |
Beginning Balance | 118,073 |  |
Foreign currency translation adjustment and other | 17 |  |
Goodwill | 118,090 |  | 118,073
Ending Balance | 118,090 |  |
Strategic Communications |  |  |
Goodwill [Line Items] |  |  |
Beginning Balance | 145,825 |  |
Foreign currency translation adjustment and other | 1,110 |  |
Goodwill | 341,074 |  | 339,964
Accumulated goodwill impairment | (194,139) |  | (194,139)
Ending Balance | $ 146,935 |  |
[1] | Includes adjustments during the purchase price measurement 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=14024403&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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