Description of the Business and Significant Accounting Policies - Narrative (Details) $ in Thousands	Jun. 27, 2021 USD ($)	Dec. 31, 2020 USD ($) property	Jun. 28, 2020 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of properties in operation | property		10
Number of properties | property		13
Non-current deferred revenue | $	$ 16,061	$ 10,508	$ 97,649
Canada's Wonderland | Pandemic COVID-19
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Non-current deferred revenue | $			$ 5,800