Loss per Share - Additional Information (Detail) - shares	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Loss Per Share [Line Items]
Potentially dilutive securities excluded from computation of loss per share	2,366,000	1,700,000
Performance-vesting Restricted Awards [Member]
Loss Per Share [Line Items]
Contingently issuable shares excluded from the calculation of diluted loss per share	1,240,000	1,696,000

Outstanding performance vesting restricted awards that are considered contingently issuable shares and are excluded from the calculation of diluted loss per share until the performance measure criteria is met as of the end of the reporting period.

No definition available.

Name:	seas_ContingentlyIssuableSharesExcludedFromCalculationOfDilutedLossPerShare
Namespace Prefix:	seas_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration