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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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenues	$ 513,012	$ 448,962	$ 1,522,884	$ 1,340,021
Adjusted Segment EBITDA	94,281	75,380	286,901	190,283
Corporate Finance & Restructuring
Segment Reporting Information [Line Items]
Revenues	135,418	128,121	419,695	351,509
Adjusted Segment EBITDA	26,798	26,734	97,379	57,107
Forensic and Litigation Consulting
Segment Reporting Information [Line Items]
Revenues	126,684	118,639	388,250	341,455
Adjusted Segment EBITDA	21,970	22,539	75,342	49,092
Economic Consulting
Segment Reporting Information [Line Items]
Revenues	139,166	111,753	405,583	374,978
Adjusted Segment EBITDA	23,238	12,061	57,846	47,680
Technology
Segment Reporting Information [Line Items]
Revenues	56,692	42,282	144,035	133,935
Adjusted Segment EBITDA	11,473	5,973	24,713	19,198
Strategic Communications
Segment Reporting Information [Line Items]
Revenues	55,052	48,167	165,321	138,144
Adjusted Segment EBITDA	$ 10,802	$ 8,073	$ 31,621	$ 17,206

X

- 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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X

- 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

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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

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