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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Goodwill [Line Items]
Goodwill	$ 1,366,455
Accumulated goodwill impairment	(194,139)
Goodwill	1,172,316
Foreign currency translation adjustment and other	241
Goodwill	1,366,696
Accumulated goodwill impairment	(194,139)
Goodwill	1,172,557
Corporate Finance & Restructuring
Goodwill [Line Items]
Goodwill	450,997
Goodwill	450,997
Foreign currency translation adjustment and other	292
Goodwill	451,289
Goodwill	451,289
Forensic and Litigation Consulting
Goodwill [Line Items]
Goodwill	231,537
Goodwill	231,537
Foreign currency translation adjustment and other	(29)
Goodwill	231,508
Goodwill	231,508
Economic Consulting
Goodwill [Line Items]
Goodwill	268,547
Goodwill	268,547
Foreign currency translation adjustment and other	(14)
Goodwill	268,533
Goodwill	268,533
Technology
Goodwill [Line Items]
Goodwill	96,723
Goodwill	96,723
Foreign currency translation adjustment and other	0
Goodwill	96,723
Goodwill	96,723
Strategic Communications
Goodwill [Line Items]
Goodwill	318,651
Accumulated goodwill impairment	(194,139)
Goodwill	124,512
Foreign currency translation adjustment and other	(8)
Goodwill	318,643
Accumulated goodwill impairment	(194,139)
Goodwill	$ 124,504

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.

+ References

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+ References

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