Goodwill and Other Intangible Assets - Summary of Goodwill Balances by Component and Segment (Details) $ in Thousands	3 Months Ended
Mar. 31, 2020 USD ($)
Goodwill [Line Items]
Balance, beginning	$ 287,983
Goodwill impairment	(72,686)
Foreign currency translation adjustments	(10,684)
Balance, ending	204,613
GES North America
Goodwill [Line Items]
Balance, beginning	155,276
Goodwill impairment	(41,887)
Foreign currency translation adjustments	(534)
Balance, ending	112,855
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	(8,363)
Balance, ending	$ 91,758

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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