Segment Information - Reconciliation of Assets from Reportable Segments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of assets from segment
Total Assets		$ 919,899	$ 869,816	$ 690,723
Total Depreciation and Amortization		55,114	42,743	35,231
Capital expenditures		56,621	49,815	29,839
GES | U.S.
Reconciliation of assets from segment
Total Assets		380,909	380,951	294,618
Total Depreciation and Amortization		29,088	21,473	18,658
Capital expenditures		17,337	14,291	8,066
GES | International
Reconciliation of assets from segment
Total Assets		135,917	109,705	115,494
Total Depreciation and Amortization		8,176	8,092	8,435
Capital expenditures		8,084	5,033	8,366
Pursuit
Reconciliation of assets from segment
Total Assets		350,256	301,941	195,527
Total Depreciation and Amortization		17,653	12,967	7,974
Capital expenditures		30,786	31,861	13,107
Corporate and other
Reconciliation of assets from segment
Total Assets		52,817	77,219	85,084
Total Depreciation and Amortization		197	211	164
Capital expenditures	[1]	$ 414	$ (1,370)	$ 300

[1] The 2016 amount includes an intercompany elimination for work completed by GES on renovations to Pursuit’s Banff Gondola.