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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 602,218	$ 593,106	$ 606,119	$ 551,274	$ 504,993	$ 513,012	$ 512,098	$ 497,774	$ 2,352,717	$ 2,027,877	$ 1,807,732
Adjusted Segment EBITDA									439,514	358,741	267,435
Corporate Finance
Segment Reporting Information [Line Items]
Revenues									723,721	564,479	482,041
Adjusted Segment EBITDA									160,735	121,660	82,863
FLC
Segment Reporting Information [Line Items]
Revenues									577,780	520,333	462,324
Adjusted Segment EBITDA									104,435	96,821	72,705
Economic Consulting
Segment Reporting Information [Line Items]
Revenues									592,542	533,979	496,029
Adjusted Segment EBITDA									84,112	69,955	61,964
Technology
Segment Reporting Information [Line Items]
Revenues									215,584	185,755	174,850
Adjusted Segment EBITDA									45,688	27,387	22,171
Strategic Communications
Segment Reporting Information [Line Items]
Revenues									243,090	223,331	192,488
Adjusted Segment EBITDA									$ 44,544	$ 42,918	$ 27,732

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

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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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.

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