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Goodwill and Other Intangible Assets - Summary of Goodwill Balances by Component and Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Balance, beginning	$ 261,330	$ 270,551
Business acquisitions	20,684
Foreign currency translation adjustments	5,969	(9,148)
Purchase price allocation adjustments		(73)
Balance, ending	287,983	261,330
GES North America
Goodwill [Line Items]
Balance, beginning	154,944	155,505
Foreign currency translation adjustments	332	(561)
Balance, ending	155,276	154,944
GES EMEA
Goodwill [Line Items]
Balance, beginning	29,954	31,612
Foreign currency translation adjustments	875	(1,658)
Balance, ending	30,829	29,954
Pursuit
Goodwill [Line Items]
Balance, beginning	76,432	83,434
Business acquisitions	20,684
Foreign currency translation adjustments	4,762	(6,929)
Purchase price allocation adjustments		(73)
Balance, ending	$ 101,878	$ 76,432

X

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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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