Goodwill and Other Intangible Assets - Summary of Goodwill Balances by Component and Segment (Details) $ in Thousands	9 Months Ended
Sep. 30, 2020 USD ($)
Goodwill [Line Items]
Balance, beginning	$ 287,983
Goodwill impairment	(186,075)
Foreign currency translation adjustments	(4,977)
Balance, ending	96,931
GES North America
Goodwill [Line Items]
Balance, beginning	155,276
Goodwill impairment	(155,276)
GES EMEA
Goodwill [Line Items]
Balance, beginning	30,829
Goodwill impairment	(29,042)
Foreign currency translation adjustments	(1,787)
Pursuit
Goodwill [Line Items]
Balance, beginning	101,878
Goodwill impairment	(1,757)
Foreign currency translation adjustments	(3,190)
Balance, ending	$ 96,931

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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