Acquisitions (Details) $ in Thousands		3 Months Ended		12 Months Ended
	Jul. 01, 2019 USD ($)	Sep. 27, 2020 USD ($)	Mar. 29, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 29, 2019 USD ($)	Jul. 01, 2019 water_park	Jul. 01, 2019 resort
Business Combination Segment Allocation [Line Items]
Goodwill, acquired	$ 178,000				$ 177,993
Right-of-use asset				$ 13,527	14,324
Operating lease, liability				12,175
Goodwill, impairment loss				93,929
Schlitterbahn
Business Combination Segment Allocation [Line Items]
Number of assets acquired								2	1
Payments for asset acquisitions	257,700
Property, plant and equipment, additions	58,100
Net working capital deficit	3,300
Impairment of long-lived assets held-for-use			$ 2,700
Goodwill, impairment loss		$ 11,300	73,600
Asset acquisition, revenue since acquisition date, actual				10,900	42,500
Asset acquisition, income (loss) since acquisition date, actual				(121,700)	12,000
Pro forma revenue					69,000	$ 66,000
Pro forma net income (loss)					11,000	$ 14,000
Asset acquisition, transaction costs					7,000
Trade names
Business Combination Segment Allocation [Line Items]
Indefinite-lived intangible assets (trade name)				49,454	59,249
Trade names | Schlitterbahn
Business Combination Segment Allocation [Line Items]
Indefinite-lived intangible assets (trade name)	23,200			$ 13,100	$ 23,200
Impairment of intangible assets		$ 2,200	$ 7,900
Non-Compete Covenants | Schlitterbahn
Business Combination Segment Allocation [Line Items]
Indefinite-lived intangible assets (trade name)	$ 200
Galveston Land
Business Combination Segment Allocation [Line Items]
Right-of-use asset							$ 6,800
Operating lease, liability							$ 5,300