Revenues - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Long term deferred revenue	$ 13,428	$ 10,000
Percentage of beginning of period deferred revenue balance remaining at end of period	5.00%
Revenue	$ 431,779	$ 1,398,244	$ 1,372,290
ZHG Stock Purchase Agreement [Member]
Disaggregation Of Revenue [Line Items]
Type of Revenue [Extensible List]	seas:FoodMerchandiseAndOtherRevenueMember	seas:FoodMerchandiseAndOtherRevenueMember	seas:FoodMerchandiseAndOtherRevenueMember
Revenue	$ 0	$ 1,700	$ 5,100
Middle East Project [Member]
Disaggregation Of Revenue [Line Items]
Long term deferred revenue	10,000
Deferred costs incurred under Middle East Project	5,900	5,000
Other Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Long term deferred revenue	$ 13,400	$ 10,000