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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 504,993 | $ 513,012 | $ 512,098 | $ 497,774 | $ 467,711 | $ 448,962 | $ 444,715 | $ 446,344 | $ 2,027,877 | $ 1,807,732 | $ 1,810,394
Adjusted Segment EBITDA |  |  |  |  |  |  |  |  | 358,741 | 267,435 | 285,944
Corporate Finance |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 564,479 | 482,041 | 483,269
Adjusted Segment EBITDA |  |  |  |  |  |  |  |  | 121,660 | 82,863 | 97,688
FLC |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 520,333 | 462,324 | 457,734
Adjusted Segment EBITDA |  |  |  |  |  |  |  |  | 96,821 | 72,705 | 57,882
Economic Consulting |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 533,979 | 496,029 | 500,487
Adjusted Segment EBITDA |  |  |  |  |  |  |  |  | 69,955 | 61,964 | 74,102
Technology |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 185,755 | 174,850 | 177,720
Adjusted Segment EBITDA |  |  |  |  |  |  |  |  | 27,387 | 22,171 | 25,814
Strategic Communications |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 223,331 | 192,488 | 191,184
Adjusted Segment EBITDA |  |  |  |  |  |  |  |  | $ 42,918 | $ 27,732 | $ 30,458

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