Goodwill and Other Intangible Assets - Summary of Goodwill Balances by Component and Segment (Details) $ in Thousands	9 Months Ended
Sep. 30, 2018 USD ($)
Goodwill [Line Items]
Balance, beginning	$ 270,551
Foreign currency translation adjustments	(3,747)
Purchase price allocation adjustments	(73)
Balance, ending	266,731
GES U.S.
Goodwill [Line Items]
Balance, beginning	148,277
Balance, ending	148,277
GES International
Goodwill [Line Items]
Balance, beginning	38,840
Foreign currency translation adjustments	(1,268)
Balance, ending	37,572
Pursuit
Goodwill [Line Items]
Balance, beginning	83,434
Foreign currency translation adjustments	(2,479)
Purchase price allocation adjustments	(73)
Balance, ending	$ 80,882

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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