Goodwill and Other Intangible Assets - Summary of Goodwill Balances by Component and Segment (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
Balance at December 31, 2014		$ 185,223	$ 194,197
Purchase price allocation adjustments and Business acquisitions		71,658	2,157
Foreign currency translation adjustments		(2,859)	(10,558)
Disposals	[1]		(573)
Balance at December 31, 2015		254,022	185,223
GES U.S.
Goodwill [Line Items]
Balance at December 31, 2014		112,300	110,618
Purchase price allocation adjustments and Business acquisitions		35,977	1,682
Balance at December 31, 2015		148,277	112,300
GES International
Goodwill [Line Items]
Balance at December 31, 2014		38,635	42,221
Purchase price allocation adjustments and Business acquisitions			475
Foreign currency translation adjustments		(4,175)	(3,488)
Disposals		(600)	(573)	[1]
Balance at December 31, 2015		34,460	38,635
Pursuit
Goodwill [Line Items]
Balance at December 31, 2014		34,288	41,358
Purchase price allocation adjustments and Business acquisitions		35,681
Foreign currency translation adjustments		1,316	(7,070)
Balance at December 31, 2015		$ 71,285	$ 34,288

[1] During 2015, the Company partially disposed of certain operations associated with a venue services contract within GES International. Accordingly, goodwill of $0.6 million was included in the carrying amount of those operations, and a loss of $23,000 was recorded in income from continuing operations related to the disposal.