Segment Information - Reconciliation of Income Statement Items from Reportable Segments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reportable segments reconciliations:
Total revenue		$ 1,127,311	$ 507,340	$ 415,435
Segment operating income (loss)		68,944	(47,002)	(116,240)
Gain on sale of ON Services		(19,637)	0	0
Interest expense		(34,891)	(28,324)	(17,887)
Other expense, net		(2,077)	(2,070)	(1,594)
Restructuring charges		(3,059)	(6,066)	(13,440)
Impairment charges		583	0	203,076
Income (loss) from continuing operations before income taxes		34,620	(95,081)	(360,859)
Pursuit
Reportable segments reconciliations:
Total revenue		299,327	187,048	76,810
GES
Reportable segments reconciliations:
Total revenue		827,984	320,292	338,625
Operating Segments | Pursuit
Reportable segments reconciliations:
Total revenue		299,327	187,048	76,810
Segment operating income (loss)		24,031	4,609	(42,343)
Restructuring charges		(55)	(85)	(132)
Impairment charges		0	0	(1,758)
Operating Segments | spiro
Reportable segments reconciliations:
Total revenue		277,641	116,587	102,027
Segment operating income (loss)		23,133	(9,556)	(41,217)
Restructuring charges		(1,015)	(575)	(1,011)
Impairment charges		0	0	(43,403)
Operating Segments | GES
Reportable segments reconciliations:
Total revenue		827,984	320,292	338,625
Segment operating income (loss)		44,913	(51,611)	(73,897)
Operating Segments | GES-Exhibitions [Member]
Reportable segments reconciliations:
Total revenue		557,880	209,529	238,705
Segment operating income (loss)		21,780	(42,055)	(32,680)
Restructuring charges		(1,960)	(5,361)	(11,336)
Impairment charges		(583)	0	(157,915)
Operating Segments | GES intersegment eliminations [Member]
Reportable segments reconciliations:
Total revenue		(7,537)	(5,824)	(2,107)
Intersegment Eliminations | GES
Reportable segments reconciliations:
Total revenue		(23,730)	(5,933)	(3,680)
Corporate Eliminations
Reportable segments reconciliations:
Segment operating income (loss)	[1]	67	70	65
Corporate
Reportable segments reconciliations:
Segment operating income (loss)		(13,418)	(11,689)	(8,687)
Restructuring charges		$ (29)	$ (45)	$ (961)

[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.