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Goodwill and Intangible Assets - Summary of Changes in Carrying Amounts of Goodwill by Operating Segment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill beginning of period	$ 1,202,767,000	$ 1,172,316,000
Acquisitions	20,632,000	27,389,000
Foreign currency translation adjustment and other	11,480,000	3,062,000
Goodwill end of period	1,234,879,000	1,202,767,000	$ 1,172,316,000
Proceeds from sale of business	0	0	50,283,000
Corporate Finance
Goodwill [Roll Forward]
Goodwill beginning of period	478,842,000	450,997,000
Acquisitions	20,632,000	27,389,000
Foreign currency translation adjustment and other	6,598,000	456,000
Goodwill end of period	506,072,000	478,842,000	450,997,000
Accumulated impairment loss	0	0	0
Proceeds from sale of business	20,600,000	27,400,000
FLC
Goodwill [Roll Forward]
Goodwill beginning of period	232,120,000	231,537,000
Foreign currency translation adjustment and other	1,254,000	583,000
Goodwill end of period	233,374,000	232,120,000	231,537,000
Accumulated impairment loss	0	0	0
Economic Consulting
Goodwill [Roll Forward]
Goodwill beginning of period	268,677,000	268,547,000
Foreign currency translation adjustment and other	410,000	130,000
Goodwill end of period	269,087,000	268,677,000	268,547,000
Accumulated impairment loss	0	0	0
Technology
Goodwill [Roll Forward]
Goodwill beginning of period	96,770,000	96,723,000
Foreign currency translation adjustment and other	51,000	47,000
Goodwill end of period	96,821,000	96,770,000	96,723,000
Accumulated impairment loss	0	0	0
Strategic Communications
Goodwill [Roll Forward]
Goodwill beginning of period	126,358,000	124,512,000
Foreign currency translation adjustment and other	3,167,000	1,846,000
Goodwill end of period	129,525,000	126,358,000	124,512,000
Accumulated impairment loss	194,100,000	194,100,000	194,100,000
Goodwill	$ 323,700,000	$ 320,500,000	$ 318,700,000

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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.

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