Segment Information - Reconciliation of Income Statement Items from Reportable Segments (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reportable segments reconciliations:
Total revenue										$ 415,435	$ 1,302,736	$ 1,237,324
Segment operating income										(124,862)	79,445	77,591
Interest income		$ 64	$ 58	$ 176	$ 79	$ 109	$ 79	$ 83	$ 98	377	369	354
Interest expense		(3,552)	(5,508)	(5,186)	(4,018)	(4,587)	(3,740)	(2,957)	(2,915)	(18,264)	(14,199)	(9,640)
Multi-employer pension plan withdrawal				(462)		(185)		(15,508)		(462)	(15,693)
Other expense		(238)	(210)	(265)	(419)	(394)	(281)	(456)	(455)	(1,132)	(1,586)	(1,744)
Restructuring (charges) recoveries		(1,070)	(11,259)	(260)	(851)	(1,535)	(1,702)	(4,455)	(688)	(13,440)	(8,380)	(1,587)
Impairment charges (recoveries)			676	114,020	88,380	5,346				203,076	5,346	(35)
Income (loss) from continuing operations before income taxes		$ (57,855)	$ (27,005)	$ (172,221)	$ (103,778)	$ (14,867)	$ 46,498	$ 20,008	$ (25,529)	(360,859)	26,110	65,009
GES
Reportable segments reconciliations:
Total revenue										338,625	1,079,923	1,052,037
Pursuit
Reportable segments reconciliations:
Total revenue										76,810	222,813	185,287
Operating Segments
Reportable segments reconciliations:
Segment operating income										(116,240)	90,243	88,517
Operating Segments | GES
Reportable segments reconciliations:
Total revenue										338,625	1,079,923	1,052,037
Segment operating income										(73,897)	35,933	39,602
Legal settlement											(8,500)
Operating Segments | Pursuit
Reportable segments reconciliations:
Total revenue										76,810	222,813	185,287
Segment operating income										(42,343)	54,310	48,915
Restructuring (charges) recoveries										(132)	(52)	(140)
Impairment charges (recoveries)										(1,758)		35
Intersegment Eliminations | GES
Reportable segments reconciliations:
Total revenue										(3,680)	(20,741)	(17,140)
Intersegment Eliminations | Pursuit
Reportable segments reconciliations:
Total revenue										(317)	(1,686)	(1,551)
Corporate Eliminations
Reportable segments reconciliations:
Segment operating income	[1]									65	67	67
Corporate
Reportable segments reconciliations:
Segment operating income										(8,687)	(10,865)	(10,993)
Restructuring (charges) recoveries										(961)	(440)	10
North America | Operating Segments | GES
Reportable segments reconciliations:
Total revenue										288,921	884,105	866,187
Segment operating income										(56,446)	27,659	29,981
Restructuring (charges) recoveries										(3,825)	(6,157)	(408)
Impairment charges (recoveries)										(171,095)	(5,346)
EMEA | Operating Segments | GES
Reportable segments reconciliations:
Total revenue										53,384	216,559	202,990
Segment operating income										(17,451)	8,274	9,621
Restructuring (charges) recoveries										(8,522)	$ (1,731)	$ (1,049)
Impairment charges (recoveries)										$ (30,223)

[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.