Goodwill and Other Intangible Assets - Summary of Goodwill Balances by Component and Segment (Details) $ in Thousands	9 Months Ended
Sep. 30, 2017 USD ($)
Goodwill [Line Items]
Balance at December 31, 2016	$ 254,022
Business acquisitions	1,060
Foreign currency translation adjustments	8,837
Balance at September 30, 2017	263,919
GES U.S.
Goodwill [Line Items]
Balance at December 31, 2016	148,277
Balance at September 30, 2017	148,277
GES International
Goodwill [Line Items]
Balance at December 31, 2016	34,460
Business acquisitions	1,060
Foreign currency translation adjustments	3,084
Balance at September 30, 2017	38,604
Pursuit
Goodwill [Line Items]
Balance at December 31, 2016	71,285
Foreign currency translation adjustments	5,753
Balance at September 30, 2017	$ 77,038

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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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