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Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Goodwill [Roll Forward]
Goodwill beginning of period		$ 1,234,879,000
Acquisitions		5,493,000
Foreign currency translation adjustment and other		(315,000)
Goodwill end of period	$ 1,240,057,000	1,240,057,000
Corporate Finance & Restructuring
Goodwill [Roll Forward]
Goodwill beginning of period		506,072,000
Acquisitions		0
Foreign currency translation adjustment and other		(1,560,000)
Goodwill end of period	504,512,000	504,512,000
Accumulated impairment loss	0	0	$ 0
Forensic and Litigation Consulting
Goodwill [Roll Forward]
Goodwill beginning of period		233,374,000
Acquisitions	5,500,000	5,493,000
Foreign currency translation adjustment and other		315,000
Goodwill end of period	239,182,000	239,182,000
Accumulated impairment loss	0	0	0
Economic Consulting
Goodwill [Roll Forward]
Goodwill beginning of period		269,087,000
Acquisitions		0
Foreign currency translation adjustment and other		38,000
Goodwill end of period	269,125,000	269,125,000
Accumulated impairment loss	0	0	0
Technology
Goodwill [Roll Forward]
Goodwill beginning of period		96,821,000
Acquisitions		0
Foreign currency translation adjustment and other		30,000
Goodwill end of period	96,851,000	96,851,000
Accumulated impairment loss	0	0	0
Strategic Communications
Goodwill [Roll Forward]
Goodwill beginning of period		129,525,000
Acquisitions		0
Foreign currency translation adjustment and other		862,000
Goodwill end of period	130,387,000	130,387,000
Accumulated impairment loss	194,100,000	194,100,000	194,100,000
Goodwill	$ 324,500,000	$ 324,500,000	$ 323,700,000

X

- 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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-SubTopic 210
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