Segment Information - Reconciliation of Income Statement Items from Reportable Segments (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Reportable segments reconciliations:
Total revenue		$ 319,203	$ 61,233	$ 496,563	$ 90,168
Interest expense, net		(7,761)	(5,565)	(13,638)	(10,650)
Corporate activities		3,440	3,006	6,113	5,011
Multi-employer pension plan withdrawal		0	(57)	0	(57)
Other expense, net		(612)	(680)	(1,250)	(1,040)
Depreciation and amortization				(26,486)	(26,510)
Restructuring charges		(1,426)	(787)	(2,080)	(3,613)
Loss from continuing operations before income taxes		23,469	(45,071)	(9,731)	(93,555)
GES
Reportable segments reconciliations:
Total revenue		241,604	24,920	395,180	44,065
Pursuit
Reportable segments reconciliations:
Total revenue		77,599	36,313	101,383	46,103
Operating Segments
Reportable segments reconciliations:
Segment operating loss		36,691	(34,994)	13,899	(73,219)
Operating Segments | GES
Reportable segments reconciliations:
Segment operating loss		31,120	(26,897)	29,526	(46,801)
Operating Segments | Pursuit
Reportable segments reconciliations:
Total revenue		77,599	36,313	101,383	46,103
Segment operating loss		5,571	(8,097)	(15,627)	(26,418)
Restructuring charges		0	0	0	(23)
Operating Segments | Spiro
Reportable segments reconciliations:
Total revenue		89,425	11,944	132,241	24,003
Segment operating loss		14,847	(7,211)	14,608	(14,380)
Restructuring charges		(808)	(126)	(1,226)	(176)
Operating Segments | GES-Exhibitions
Reportable segments reconciliations:
Total revenue		154,600	13,057	266,431	20,209
Segment operating loss		16,273	(19,686)	14,918	(32,421)
Restructuring charges		(588)	(661)	(824)	(3,394)
Impairment charges		(0)	0	(583)	0
Operating Segments | GES intersegment eliminations [Member]
Reportable segments reconciliations:
Total revenue		(2,421)	(81)	(3,492)	(147)
Corporate Eliminations
Reportable segments reconciliations:
Segment operating loss	[1]	17	18	34	35
Corporate
Reportable segments reconciliations:
Segment operating loss		(3,440)	(3,006)	(6,113)	(5,011)
Restructuring charges		$ (30)	$ 0	$ (30)	$ (20)

[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.