Segment Information - Reconciliation of Income Statement Items from Reportable Segments (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Reportable segments reconciliations:
Total revenue		$ 63,072	$ 353,743	$ 389,863	$ 1,009,686
Segment operating income (loss)		(9,410)	52,142	(71,803)	82,374
Interest income		58	79	313	260
Interest expense		(5,508)	(3,740)	(14,712)	(9,612)
Multi-employer pension plan withdrawal				(462)	(15,508)
Other expense		(210)	(281)	(894)	(1,192)
Restructuring recoveries (charges)		(11,259)	(1,702)	(12,370)	(6,845)
Impairment charges		676		203,076
Income (loss) from continuing operations before income taxes		(27,005)	46,498	(303,004)	40,977
GES
Reportable segments reconciliations:
Total revenue		14,257	218,700	322,261	808,567
Pursuit
Reportable segments reconciliations:
Total revenue		48,815	135,043	67,602	201,119
Operating Segments
Reportable segments reconciliations:
Segment operating income (loss)		(6,781)	54,806	(65,949)	90,120
Operating Segments | GES
Reportable segments reconciliations:
Total revenue		14,257	218,700	322,261	808,567
Segment operating income (loss)		(18,248)	(11,586)	(39,450)	25,410
Legal settlement					(8,500)
Operating Segments | Pursuit
Reportable segments reconciliations:
Total revenue		48,815	135,043	67,602	201,119
Segment operating income (loss)		11,467	66,392	(26,499)	64,710
Restructuring recoveries (charges)		12		(45)
Impairment charges				(1,757)
Intersegment Eliminations | GES
Reportable segments reconciliations:
Total revenue		(284)	(5,724)	(3,258)	(14,731)
Intersegment Eliminations | Pursuit
Reportable segments reconciliations:
Total revenue		(144)	(671)	(261)	(1,355)
Corporate Eliminations
Reportable segments reconciliations:
Segment operating income (loss)	[1]	16	16	48	49
Corporate
Reportable segments reconciliations:
Segment operating income (loss)		(2,645)	(2,680)	(5,902)	(7,795)
Restructuring recoveries (charges)		(585)	(62)	(954)	(205)
EMEA | Operating Segments | GES
Reportable segments reconciliations:
Total revenue		2,774	39,300	52,096	156,473
Segment operating income (loss)		(7,262)	(3,024)	(11,256)	2,775
Restructuring recoveries (charges)		(8,376)	(759)	(9,094)	(1,501)
Impairment charges		(676)		(30,225)
North America | Operating Segments | GES
Reportable segments reconciliations:
Total revenue		11,767	185,124	273,423	666,825
Segment operating income (loss)		(10,986)	(8,562)	(28,194)	22,635
Restructuring recoveries (charges)		$ (2,310)	$ (881)	(2,277)	$ (5,139)
Impairment charges				$ (171,094)

[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.