Acquisition of Businesses - Narrative (Details) € in Millions, CAD in Millions									1 Months Ended	12 Months Ended
	Nov. 03, 2017 USD ($)	Nov. 03, 2017 EUR (€)	Dec. 29, 2016 USD ($)	Dec. 29, 2016 CAD	Aug. 11, 2016 USD ($)	Mar. 11, 2016 USD ($)	Jan. 04, 2016 USD ($)	Jan. 04, 2016 CAD	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Poken Event Engagement Technology
Business Acquisition [Line Items]
Purchase price									$ 1,700,000
Acquisition related costs										$ 300,000
Esja Attractions ehf.
Business Acquisition [Line Items]
Purchase price	$ 9,500,000	€ 8.2
Acquisition related costs										$ 100,000
Business acquisition date										Nov. 03, 2017
Percentage of controlling interest acquired	54.50%
Estimated fair value of non-controlling interest	$ 6,700,000
Operating income (losses)										$ (100,000)
Maligne Tours Ltd
Business Acquisition [Line Items]
Purchase price							$ 14,962,000	CAD 20.9
Acquisition related costs										$ 100,000	$ 100,000	$ 200,000
Business acquisition date										Jan. 04, 2016
CATC Alaska Tourism Corporation
Business Acquisition [Line Items]
Purchase price						$ 45,000,000
Acquisition related costs										$ 100,000	100,000	$ 600,000
Business acquisition date										Mar. 11, 2016
Percentage of controlling interest acquired						100.00%
ON Event Services LLC
Business Acquisition [Line Items]
Purchase price					$ 87,000,000
Acquisition related costs										$ 100,000	900,000
Business acquisition date										Aug. 11, 2016
Estimated fair value of Earnout					$ 540,000
Goodwill expected to be tax deductible, term of recognition					15 years
ON Event Services LLC | Maximum
Business Acquisition [Line Items]
Aggregate purchase price					$ 92,500,000
Contingent liability					$ 5,500,000
FlyOver Canada
Business Acquisition [Line Items]
Purchase price			$ 50,920,000	CAD 68.8
Acquisition related costs										$ 100,000	$ 500,000
Business acquisition date										Dec. 29, 2016