Revenues - Additional Information (Detail) - USD ($)		3 Months Ended															12 Months Ended
	Jan. 01, 2018	Dec. 31, 2019		Sep. 30, 2019	Jun. 30, 2019	[2]	Mar. 31, 2019	[3]	Dec. 31, 2018		Sep. 30, 2018	[5]	Jun. 30, 2018	[6]	Mar. 31, 2018	[7]	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Cumulative adjustment to beginning retained earnings	$ 0
Long term deferred revenue		$ 10,000,000							$ 10,071,000								$ 10,000,000	$ 10,071,000
Deferred revenue short term portion revenue recognized																	101,100,000
Revenue		298,011,000	[1]	$ 473,666,000	$ 405,992,000		$ 220,575,000		280,028,000	[4]	$ 483,175,000		$ 391,921,000		$ 217,166,000		1,398,244,000	$ 1,372,290,000	$ 1,263,324,000
ZHG Stock Purchase Agreement [Member]
Disaggregation Of Revenue [Line Items]
Deferred Revenue		2,400,000															$ 2,400,000
Type of Revenue [Extensible List]																	seas:FoodMerchandiseAndOtherRevenueMember	seas:FoodMerchandiseAndOtherRevenueMember	seas:FoodMerchandiseAndOtherRevenueMember
Revenue																	$ 1,700,000	$ 5,100,000	$ 3,900,000
Middle East Project [Member]
Disaggregation Of Revenue [Line Items]
Long term deferred revenue		10,000,000.0															10,000,000.0
Deferred costs incurred under Middle East Project		$ 5,000,000.0							$ 3,800,000								$ 5,000,000.0	$ 3,800,000

[1] During the fourth quarter of 2019, the Company recorded $32.1 million of pre-tax expenses associated with a legal settlement accrual, net of insurance recoveries.  See Note 15–Commitments and Contingencies for further details.

[2] During the second quarter of 2019, the Company recorded $4.3 million of pre-tax expenses associated with a previously disclosed transfer of shares and HP Agreements. See Note 17–Related-Party Transactions for further details.

[3] During the first quarter of 2019, the Company recorded $2.6 million of pre-tax expenses associated with separation-related costs.  See Note 21–Severance and Other Separation Costs for further details.

[4] During the fourth quarter of 2018, the Company recorded a loss on early extinguishment of debt and write-off of discounts and debt issuance costs of $8.2 million related the Amended Credit Agreement. See Note 11–Long-Term Debt for further details. The Company also recorded approximately $2.5 million in fixed asset disposals associated with certain rides and equipment which were removed from service during the quarter. See Note 8–Property and Equipment, Net for further details.

[5] During the third quarter of 2018, the Company recorded $3.9 million in severance and other separation costs primarily related to severance costs and other termination benefits. See Note 21–Severance and Other Separation Costs for further details. The Company also recorded approximately $3.8 million in fixed asset disposals associated with certain rides and equipment which were removed from service during the quarter. See Note 8–Property and Equipment, Net for further details.

[6] During the second quarter of 2018, the Company recorded $8.7 million of pre-tax expenses associated with separation-related costs and a legal settlement accrual.  See Note 15–Commitments and Contingencies and Note 21–Severance and Other Separation Costs for further details. The Company also recorded approximately $4.5 million in fixed asset disposals associated with certain rides and equipment which were removed from service during the quarter. See Note 8–Property and Equipment, Net for further details.

[7] During the first quarter of 2018, the Company recorded $21.5 million of pre-tax expenses associated with separation-related costs and a legal settlement accrual.  See Note 15–Commitments and Contingencies and Note 21–Severance and Other Separation Costs for further details.