Segment Information - Reconciliation of Income Statement Items from Reportable Segments (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Reportable segments reconciliations:
Total revenue		$ 306,008	$ 285,594
Segment operating income (loss)		(10,189)	(13,069)
Interest income		79	98
Interest expense		(4,018)	(2,915)
Other expense		(419)	(455)
Restructuring recoveries (charges)		(851)	(688)
Impairment charges		88,380
Loss from continuing operations before income taxes		(103,778)	(25,529)
GES
Reportable segments reconciliations:
Total revenue		292,485	274,927
Pursuit
Reportable segments reconciliations:
Total revenue		13,523	10,667
Operating Segments
Reportable segments reconciliations:
Segment operating income (loss)		(9,416)	(11,252)
Operating Segments | GES
Reportable segments reconciliations:
Total revenue		292,485	274,927
Segment operating income (loss)		10,858	1,743
Legal settlement			(8,500)
Operating Segments | Pursuit
Reportable segments reconciliations:
Total revenue		13,523	10,667
Segment operating income (loss)		(20,274)	(12,995)
Restructuring recoveries (charges)		(1)
Impairment charges		(1,757)
Intersegment Eliminations | GES
Reportable segments reconciliations:
Total revenue		(1,989)	(2,690)
Intersegment Eliminations | Pursuit
Reportable segments reconciliations:
Total revenue		(111)	(185)
Corporate Eliminations
Reportable segments reconciliations:
Segment operating income (loss)	[1]	16	16
Corporate
Reportable segments reconciliations:
Segment operating income (loss)		(789)	(1,833)
Restructuring recoveries (charges)		(194)	(43)
EMEA | Operating Segments | GES
Reportable segments reconciliations:
Total revenue		42,716	54,376
Segment operating income (loss)		(1,108)	1,135
Restructuring recoveries (charges)		(735)	(662)
Impairment charges		(29,042)
North America | Operating Segments | GES
Reportable segments reconciliations:
Total revenue		251,758	223,241
Segment operating income (loss)		11,966	608
Restructuring recoveries (charges)		79	$ 17
Impairment charges		$ (57,581)

[1] Corporate eliminations 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.