Segment Information - Reconciliation of Income Statement Items from Reportable Segments (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reportable segments reconciliations:
Total revenue		$ 339,099	$ 382,465	$ 1,029,680	$ 948,574
Segment operating income (loss)		43,683	56,145	91,291	79,261
Interest income		74	44	174	138
Interest expense		(2,117)	(1,489)	(6,281)	(4,109)
Restructuring charges		(255)	(1,697)	(817)	(3,664)
Impairment recoveries (charges):		24,467	(120)	29,098	(120)
Income from continuing operations before income taxes		65,852	52,883	113,465	71,506
Operating Segments
Reportable segments reconciliations:
Segment operating income (loss)		48,139	59,435	101,333	87,591
Operating Segments | GES
Reportable segments reconciliations:
Total revenue		232,119	286,985	870,099	808,549
Segment operating income (loss)		(5,721)	15,187	47,810	42,858
Operating Segments | Pursuit
Reportable segments reconciliations:
Total revenue		106,980	97,402	159,581	143,111
Segment operating income (loss)		53,860	44,248	53,523	44,733
Restructuring charges					(93)
Impairment recoveries (charges):		24,467	(120)	29,098	(120)
Intersegment Eliminations | GES
Reportable segments reconciliations:
Total revenue		(6,682)	(6,425)	(17,126)	(15,439)
Corporate Eliminations
Reportable segments reconciliations:
Total revenue	[1]		(1,922)		(3,086)
Segment operating income (loss)	[1]	18	(518)	50	(940)
Corporate
Reportable segments reconciliations:
Segment operating income (loss)		(4,474)	(2,772)	(10,092)	(7,390)
Restructuring charges		(1)	4	(138)	(406)
U.S. | Operating Segments | GES
Reportable segments reconciliations:
Total revenue		184,761	232,484	684,003	636,299
Segment operating income (loss)		(2,851)	14,543	39,319	37,907
Restructuring charges		435	(1,498)	364	(1,791)
International | Operating Segments | GES
Reportable segments reconciliations:
Total revenue		54,040	60,926	203,222	187,689
Segment operating income (loss)		(2,870)	644	8,491	4,951
Restructuring charges		$ (689)	$ (203)	$ (1,043)	$ (1,374)

[1] Corporate eliminations recorded during the three and nine months ended September 30, 2017 represent the elimination of depreciation expense recorded by Pursuit associated with previously eliminated intercompany profit realized by GES for renovations to Pursuit’s Banff Gondola. The corporate eliminations recorded during the three and nine months ended September 30, 2016 represent the elimination of intercompany revenue and profit realized by GES for work completed on renovations to Pursuit’s Banff Gondola.