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Segment Reporting - Revenues and Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization for Reportable Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 467,711 | $ 448,962 | $ 444,715 | $ 446,344 | $ 441,920 | $ 438,042 | $ 460,147 | $ 470,285 | $ 1,807,732 | $ 1,810,394 | $ 1,779,149
Adjusted Segment EBITDA |  |  |  |  |  |  |  |  | 267,435 | 285,944 | 283,435
Corporate Finance & Restructuring |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 482,041 | 483,269 | 440,398
Adjusted Segment EBITDA |  |  |  |  |  |  |  |  | 82,863 | 97,688 | 90,101
Forensic and Litigation Consulting |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 462,324 | 457,734 | 482,269
Adjusted Segment EBITDA |  |  |  |  |  |  |  |  | 72,705 | 57,882 | 64,267
Economic Consulting |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 496,029 | 500,487 | 447,909
Adjusted Segment EBITDA |  |  |  |  |  |  |  |  | 61,964 | 74,102 | 62,330
Technology |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 174,850 | 177,720 | 218,599
Adjusted Segment EBITDA |  |  |  |  |  |  |  |  | 22,171 | 25,814 | 39,010
Strategic Communications |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 192,488 | 191,184 | 189,974
Adjusted Segment EBITDA |  |  |  |  |  |  |  |  | $ 27,732 | $ 30,458 | $ 27,727

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- Definition Segment's share of consolidated operating income before depreciation, amortization of intangible assets, remeasurement of acquisition-related contingent consideration, special charges and goodwill impairment charges. + References No definition available. + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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