Debt and Finance Lease Obligations - Narrative (Details) € in Millions				3 Months Ended
		May 14, 2020	Oct. 24, 2018 USD ($)	Mar. 31, 2020 USD ($)	Apr. 30, 2020 USD ($)	Mar. 17, 2020 USD ($)	Dec. 31, 2019 USD ($)	Feb. 15, 2019 USD ($)	Feb. 15, 2019 EUR (€)
FlyOver Iceland Credit Facility
Line of Credit Facility [Line Items]
Maturity date		Sep. 01, 2022		Mar. 01, 2022
Revolving credit facility, balance outstanding	[1]			$ 5,254,000			$ 5,607,000
Maximum borrowing capacity on credit facility								$ 5,600,000	€ 5.0
Line of credit facility amendment description				an addendum to the FlyOver Iceland Credit Facility effective May 14, 2020 wherein the principal and interest payments will be deferred for six months beginning June 1, 2020, with the first payment due December 1, 2020. The addendum also extended the maturity date to September 1, 2022. There were no other changes to the terms of the FlyOver Iceland Credit Facility.
Line of credit facility, date of first required payment		Dec. 01, 2020
2018 Credit Agreement | Revolving Credit Facility
Line of Credit Facility [Line Items]
Borrowing capacity on line of credit			$ 450,000,000
Additional borrowing capacity on line of credit			250,000,000
Line of Credit borrowings used to support letter of credit			$ 20,000,000
Maturity date			Oct. 24, 2023
Interest coverage ratio				916.00%
Leverage ratio				313.00%
Financial covenants leverage ratio step up			400.00%
Minimum amount for material acquisition			$ 50,000,000
Annual share repurchase and dividends limit on leverage ratio basis			$ 20,000,000
Leverage ratio required for dividend or share activity			275.00%
Maximum additional dividends amount permitted to distribute			$ 15,000,000
Commitment fee percentage on line of credit				0.35%
Remaining borrowing capacity on line of credit				$ 33,800,000		$ 123,000,000.0
Revolving credit facility, balance outstanding	[1]			412,551,000			$ 311,464,000
Letters of credit outstanding				$ 3,600,000
2018 Credit Agreement | Revolving Credit Facility | Subsequent Event
Line of Credit Facility [Line Items]
Remaining borrowing capacity on line of credit					$ 31,000,000
2018 Credit Agreement | Revolving Credit Facility | Minimum
Line of Credit Facility [Line Items]
Interest coverage ratio			300.00%
Leverage ratio			350.00%
Top Tier Foreign Subsidiaries | 2018 Credit Agreement | Revolving Credit Facility
Line of Credit Facility [Line Items]
Percent of lenders security interest on capital stock foreign subsidiary			65.00%

[1] Represents the weighted-average interest rate in effect at the respective periods, including any applicable margin. The interest rates do not include amortization of debt issuance costs or commitment fees.