Revenue Recognition - Narrative (Details) $ in Thousands		6 Months Ended
	Jan. 01, 2021 USD ($)	Jun. 27, 2021 USD ($) monthly_installment	Dec. 31, 2020 USD ($)	Jun. 28, 2020 USD ($)
Disaggregation of Revenue [Line Items]
Non-current deferred revenue		$ 16,061	$ 10,508	$ 97,649
Deferred revenue	$ 183,400	275,506	183,354	103,834
Deferred revenue percentage, season-long products	90.00%
Revenue from contract with customer		$ 39,000
Payment terms for billing		30 days
Allowance for doubtful accounts receivable		$ 10,800	$ 8,700	6,700
Pandemic COVID-19 | Canada's Wonderland
Disaggregation of Revenue [Line Items]
Non-current deferred revenue				5,800
Pandemic COVID-19 | Non-Current Deferred Revenue
Disaggregation of Revenue [Line Items]
Non-current deferred revenue	$ 10,500			88,600
Deferred revenue				$ 88,579
Minimum
Disaggregation of Revenue [Line Items]
Operating period		130 days
Number of monthly installments | monthly_installment		3
Maximum
Disaggregation of Revenue [Line Items]
Operating period		140 days
Number of monthly installments | monthly_installment		12