Revenue and Related Contract Costs and Contract Liabilities - Disaggregate GES and Pursuit Revenue by Major Product Line Timing of Revenue Recognition and Markets Served (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation Of Revenue [Line Items]
Total revenue		$ 233,599	$ 62,807	$ 323,767	$ 387,532
GES
Disaggregation Of Revenue [Line Items]
Total revenue		116,044	13,992	160,109	319,930
GES | Operating Segments
Disaggregation Of Revenue [Line Items]
Total revenue		116,044	13,992	160,109	319,930
GES | Intersegment Eliminations
Disaggregation Of Revenue [Line Items]
Total revenue		(688)	(284)	(1,930)	(3,258)
Pursuit
Disaggregation Of Revenue [Line Items]
Total revenue		117,555	48,815	163,658	67,602
Pursuit | Operating Segments
Disaggregation Of Revenue [Line Items]
Total revenue		117,555	48,815	163,658	67,602
Pursuit | Intersegment Eliminations
Disaggregation Of Revenue [Line Items]
Total revenue		(406)	(144)	(463)	(261)
North America | GES | Operating Segments
Disaggregation Of Revenue [Line Items]
Total revenue		92,648	11,686	127,978	272,391
EMEA | GES | Operating Segments
Disaggregation Of Revenue [Line Items]
Total revenue		24,084	2,590	34,061	50,797
Services Transferred Over Time | GES
Disaggregation Of Revenue [Line Items]
Total revenue		100,865	12,031	139,241	287,457
Services Transferred Over Time | Pursuit
Disaggregation Of Revenue [Line Items]
Total revenue		82,099	31,406	114,929	45,595
Products Transferred Over Time | GES
Disaggregation Of Revenue [Line Items]
Total revenue	[1]	6,509	247	7,659	13,442
Products Transferred at a Point in Time | GES
Disaggregation Of Revenue [Line Items]
Total revenue		8,670	1,714	13,209	19,031
Products Transferred at a Point in Time | Pursuit
Disaggregation Of Revenue [Line Items]
Total revenue		(35,456)	17,409	48,729	22,007
Exhibitions And Conferences | GES
Disaggregation Of Revenue [Line Items]
Total revenue		81,029	4,625	96,881	222,038
Brand Experiences | GES
Disaggregation Of Revenue [Line Items]
Total revenue		31,009	8,895	55,194	85,831
Venue Services | GES
Disaggregation Of Revenue [Line Items]
Total revenue		4,006	472	8,034	12,061
Accommodations | Pursuit
Disaggregation Of Revenue [Line Items]
Total revenue		(37,553)	18,021	54,742	23,994
Admissions | Pursuit
Disaggregation Of Revenue [Line Items]
Total revenue		(39,480)	12,229	51,069	17,865
Transportation | Pursuit
Disaggregation Of Revenue [Line Items]
Total revenue		3,453	445	4,913	2,513
Travel Planning and Other | Pursuit
Disaggregation Of Revenue [Line Items]
Total revenue		2,019	855	4,668	1,484
Total Services | Pursuit
Disaggregation Of Revenue [Line Items]
Total revenue		82,099	31,406	114,929	45,595
Food and Beverage | Pursuit
Disaggregation Of Revenue [Line Items]
Total revenue		18,029	6,783	25,152	9,047
Retail Operations | Pursuit
Disaggregation Of Revenue [Line Items]
Total revenue		17,427	10,626	23,577	12,960
Products
Disaggregation Of Revenue [Line Items]
Total revenue		50,635	19,370	69,597	54,480
Products | Pursuit
Disaggregation Of Revenue [Line Items]
Total revenue		35,456	17,409	48,729	22,007
Banff Jasper Collection | Pursuit
Disaggregation Of Revenue [Line Items]
Total revenue		(52,602)	26,395	71,720	39,234
Alaska Collection | Pursuit
Disaggregation Of Revenue [Line Items]
Total revenue		(25,932)	5,436	37,279	6,167
Glacier Park Collection | Pursuit
Disaggregation Of Revenue [Line Items]
Total revenue		(32,081)	14,929	43,627	16,813
FlyOver | Pursuit
Disaggregation Of Revenue [Line Items]
Total revenue		(2,296)	$ 2,055	3,494	$ 5,388
Sky Lagoon | Pursuit
Disaggregation Of Revenue [Line Items]
Total revenue	[2]	$ (4,644)		$ 7,538

[1] GES’ graphics product revenue is earned over time over the duration of an event as it is considered a part of the single performance obligation satisfied over time.

[2] We opened Pursuit’s new Sky Lagoon attraction on April 30, 2021 in Reykjavik, Iceland.