Segment Information - Reconciliation of Income Statement Items from Reportable Segments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reportable segments reconciliations:
Total revenue		$ 1,238,680	$ 1,127,311	$ 507,340
Segment operating income (loss)		108,443	68,944	(47,002)
Gain on sale of ON Services		(204)	19,637	0
Interest expense		(47,978)	(34,891)	(28,324)
Other expense, net		(2,033)	(2,077)	(2,070)
Restructuring charges		(1,174)	(3,059)	(6,066)
Impairment charges		0	583	0
Income (loss) from continuing operations before income taxes		43,073	34,620	(95,081)
Pursuit
Reportable segments reconciliations:
Total revenue		350,285	299,327	187,048
GES
Reportable segments reconciliations:
Total revenue		888,395	827,984	320,292
Operating Segments | Pursuit
Reportable segments reconciliations:
Total revenue		350,285	299,327	187,048
Segment operating income (loss)		53,381	24,031	4,609
Restructuring charges		(199)	(55)	(85)
Operating Segments | spiro
Reportable segments reconciliations:
Total revenue		283,171	277,641	116,587
Segment operating income (loss)		23,723	23,133	(9,556)
Restructuring charges		(329)	(1,015)	(575)
Operating Segments | GES
Reportable segments reconciliations:
Total revenue		888,395	827,984	320,292
Segment operating income (loss)		55,062	44,913	(51,611)
Operating Segments | GES Exhibitions
Reportable segments reconciliations:
Total revenue		614,418	557,880	209,529
Segment operating income (loss)		31,339	21,780	(42,055)
Restructuring charges		(646)	(1,960)	(5,361)
Impairment charges			(583)
Operating Segments | Intersegment eliminations
Reportable segments reconciliations:
Total revenue		(9,194)	(7,537)	(5,824)
Intersegment Eliminations | GES
Reportable segments reconciliations:
Total revenue		(34,140)	(23,730)	(5,933)
Corporate Eliminations
Reportable segments reconciliations:
Segment operating income (loss)	[1]	59	67	70
Corporate
Reportable segments reconciliations:
Segment operating income (loss)		(14,040)	(13,418)	(11,689)
Restructuring charges		$ 0	$ (29)	$ (45)

[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