Segment Information - Reconciliation of Income Statement Items from Reportable Segments (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Reportable segments reconciliations:
Total revenue		$ 273,497	$ 260,791
Segment operating income (loss)		(8,473)	(5,528)
Interest expense, net		(11,845)	(12,249)
Other expense, net		(438)	(531)
Restructuring charges		(116)	(453)
Income (loss) from continuing operations before income taxes		(25,289)	(21,910)
GES
Reportable segments reconciliations:
Total revenue		236,266	228,128
Pursuit
Reportable segments reconciliations:
Total revenue		37,231	32,663
Operating Segments | GES
Reportable segments reconciliations:
Total revenue		236,266	228,128
Segment operating income (loss)		15,358	13,584
Operating Segments | Pursuit
Reportable segments reconciliations:
Total revenue		37,231	32,663
Segment operating income (loss)		(23,831)	(19,112)
Restructuring charges		0	(7)
Operating Segments | Spiro
Reportable segments reconciliations:
Total revenue		61,248	60,362
Segment operating income (loss)		4,001	3,174
Restructuring charges		(42)	(137)
Operating Segments | GES-Exhibitions
Reportable segments reconciliations:
Total revenue		175,840	169,497
Segment operating income (loss)		11,357	10,410
Restructuring charges		(74)	(309)
Operating Segments | GES intersegment eliminations [Member]
Reportable segments reconciliations:
Total revenue		(822)	(1,731)
Corporate Eliminations
Reportable segments reconciliations:
Segment operating income (loss)	[1]	16	16
Corporate
Reportable segments reconciliations:
Segment operating income (loss)		$ (4,433)	$ (3,165)

[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.