Common stock beneficial ownership shares.

No definition available.

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

- Definition

Number of directors appointed.

+ References

No definition available.

+ Details

Name:	seas_NumberOfDirectorsAppointed
Namespace Prefix:	seas_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage shares held.

+ References

No definition available.

+ Details

Name:	seas_PercentageSharesHeld
Namespace Prefix:	seas_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Reimbursable expenses incurred.

+ References

No definition available.

+ Details

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

- Definition

Stock purchase agreement closing date

+ References

No definition available.

+ Details

Name:	seas_StockPurchaseAgreementClosingDate
Namespace Prefix:	seas_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Stock purchased under stock purchase agreement.

+ References

No definition available.

+ Details

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

- Definition

Stock repurchased agreement closing date

+ References

No definition available.

+ Details

Name:	seas_StockRepurchasedAgreementClosingDate
Namespace Prefix:	seas_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

+ Details

Name:	us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Per share or per unit amount of equity securities issued.

+ References

No definition available.

+ Details

Name:	us-gaap_SharesIssuedPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
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-Publisher FASB
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-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_BeneficialOwnerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Balance Type:
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- Details

Name:	srt_RangeAxis=srt_MaximumMember
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Related-Party Transactions - Additional Information (Detail)			12 Months Ended
	May 27, 2019 USD ($) Director $ / shares shares	May 03, 2019 shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares
Related Party Transaction [Line Items]
Stock repurchased agreement closing date				May 30, 2019
Hill Path Capital LP [Member]
Related Party Transaction [Line Items]
Percentage of ownership by partnership	34.60%
Share Repurchase Program [Member]
Related Party Transaction [Line Items]
Stock Repurchase Program, number of shares repurchased \| shares	5,615,874		469,785	5,615,874	3,654,816
Stock repurchases under Share Repurchase Program \| $	$ 150,000,000.0		$ 12,400,000	$ 150,000,000.0	$ 98,000,000.0
Price per share \| $ / shares	$ 26.71
Sun Wise [Member]
Related Party Transaction [Line Items]
Beneficial ownership of common stock, shares \| shares		19,452,063
Hill Path Capital LP [Member]
Related Party Transaction [Line Items]
Price per share \| $ / shares	$ 26.71
Stock purchased under stock purchase agreement \| shares	13,214,000
Stock purchase agreement closing date				May 30, 2019
Reimbursable expenses incurred \| $	$ 250,000
Percentage shares held	24.90%
Hill Path Capital LP [Member] \| Maximum [Member]
Related Party Transaction [Line Items]
Number of directors appointed \| Director	3
Reimbursable expenses incurred \| $				$ 250,000