Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 27, 2020	Mar. 29, 2020	Dec. 31, 2020	Dec. 31, 2019	Jul. 01, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill, impairment loss			$ 93,929
Goodwill			266,961	$ 359,654		$ 178,719
Trade names
Goodwill [Line Items]
Indefinite-lived intangible assets (trade name)			49,454	59,249
Dorney Park
Goodwill [Line Items]
Goodwill, impairment loss	$ 2,300	$ 6,800
Schlitterbahn
Goodwill [Line Items]
Goodwill, impairment loss	11,300	73,600
Goodwill			93,100	178,000
Schlitterbahn | Trade names
Goodwill [Line Items]
Impairment of intangible assets	$ 2,200	$ 7,900
Indefinite-lived intangible assets (trade name)			$ 13,100	$ 23,200	$ 23,200