Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Transfers between Levels	$ 0	$ 0

Number of transfers of financial instruments measured on a recurring basis out of one level and into another of the fair value hierarchy.

No definition available.

Name:	seas_TransfersBetweenFairValueMeasurementLevels
Namespace Prefix:	seas_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration