Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Goodwill impairment			$ 415,500	$ 229,700
Income tax benefit related to goodwill impairment charges		$ 12,400
Full Impairement Charges	$ 113,100
Remaining goodwill balance			99,847	287,983	$ 261,330
Impairment charge to intangible assets			15,700	1,500
Services
Segment Reporting Information [Line Items]
Intangible asset amortization expense			6,400	10,600	11,000
G E S U S
Segment Reporting Information [Line Items]
Goodwill impairment		41,900
GES EMEA
Segment Reporting Information [Line Items]
Goodwill impairment		29,000
Remaining goodwill balance				30,829	29,954
Pursuit Glacier Park Collection
Segment Reporting Information [Line Items]
Goodwill impairment		$ 1,800
Pursuit
Segment Reporting Information [Line Items]
Remaining goodwill balance			$ 99,847	$ 101,878	$ 76,432