Goodwill and Other Intangible Assets - Summary of Goodwill Balances by Component and Segment (Details) $ in Thousands	6 Months Ended
Jun. 30, 2018 USD ($)
Goodwill [Line Items]
Balance, beginning	$ 270,551
Foreign currency translation adjustments	(4,528)
Balance, ending	266,023
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	(1,038)
Balance, ending	37,802
Pursuit
Goodwill [Line Items]
Balance, beginning	83,434
Foreign currency translation adjustments	(3,490)
Balance, ending	$ 79,944

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 50
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