Segment Information - Reconciliation of Income Statement Items from Reportable Segments (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Reportable segments reconciliations:
Total revenue		$ 402,279	$ 363,677	$ 687,873	$ 641,105
Segment operating income		43,301	36,244	30,232	23,228
Interest income		83	53	181	137
Interest expense		(2,957)	(2,354)	(5,872)	(4,423)
Multi-employer pension plan withdrawal		(15,508)		(15,508)
Other expense		(456)	(543)	(911)	(781)
Restructuring recoveries (charges)		(4,455)	(662)	(5,143)	(824)
Income (loss) from continuing operations before income taxes		20,008	32,773	(5,521)	17,372
GES
Reportable segments reconciliations:
Total revenue		346,870	315,322	621,797	583,028
Pursuit
Reportable segments reconciliations:
Total revenue		55,409	48,355	66,076	58,077
Operating Segments
Reportable segments reconciliations:
Segment operating income		46,566	38,762	35,314	27,947
Operating Segments | GES
Reportable segments reconciliations:
Total revenue		346,870	315,322	621,797	583,028
Segment operating income		35,253	29,005	36,996	29,585
Legal settlement				(8,500)
Operating Segments | Pursuit
Reportable segments reconciliations:
Total revenue		55,409	48,355	66,076	58,077
Segment operating income		11,313	9,757	(1,682)	(1,638)
Restructuring recoveries (charges)					(140)
Impairment recoveries			35		35
Intersegment Eliminations | GES
Reportable segments reconciliations:
Total revenue		(6,317)	(6,231)	(9,007)	(9,509)
Intersegment Eliminations | Pursuit
Reportable segments reconciliations:
Total revenue		(499)	(500)	(684)	(706)
Corporate Eliminations
Reportable segments reconciliations:
Segment operating income	[1]	17	17	33	33
Corporate
Reportable segments reconciliations:
Segment operating income		(3,282)	(2,535)	(5,115)	(4,752)
Restructuring recoveries (charges)		(100)		(143)	10
North America | Operating Segments | GES
Reportable segments reconciliations:
Total revenue	[2]	283,682	260,891	506,923	482,955
Segment operating income		30,589	23,767	31,197	23,688
Restructuring recoveries (charges)		(4,275)	(240)	(4,258)	(240)
EMEA | Operating Segments | GES
Reportable segments reconciliations:
Total revenue	[2]	69,505	60,662	123,881	109,582
Segment operating income		4,664	5,238	5,799	5,897
Restructuring recoveries (charges)		$ (80)	$ (422)	$ (742)	$ (454)

[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.

[2] During the first quarter of 2019, we realigned GES’ organizational structure. As a result, we changed GES’ reportable segments to reflect how our chief operating decision maker regularly reviews and makes decisions regarding the allocation of resources. Accordingly, GES’ new reportable segments are GES North America and GES EMEA.