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Aggregate Principal Amount Partially Redeemed.

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Aggregate principal amount redeemed.

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Credit facility maximum required first lien secured leverage ratio as defined in the applicable agreement required to incur additional incremental term loans.

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Percent of original principal amount on effective date used to calculate aggregate annual amount which will amortize in equal quarterly installments.

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Debt Instrument Redeemable Accrued and Unpaid Interest Price Percentage

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Debt instrument restrictive covenants liquidity test minimum liability.

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Amount of discount initially recorded upon the issuance of the Loans.

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Excludable letters of credit under maximum required first lien secured leverage ratio.

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Initial aggregate principal amount, Allowable redeemable percentage.

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Minimum percentage of loan and letters of credit for covenant to apply.

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Percentage Of Interest In Subsidiary

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Percentage of notes redeemable.

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Percentage of notes redeemable after change of control.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Description of debt redemption features under terms of the debt agreement.

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End date of debt instrument redemption period, in CCYY-MM-DD format.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Percentage of principal amount of debt redeemed.

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Describes the provision of a debt agreement that requires the borrower to periodically place monies into a fund which is used to retire, typically annually, a portion of the outstanding debt.

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Date the derivative contract matures, in CCYY-MM-DD format.

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Nominal or face amount used to calculate payment on derivative.

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Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Number of interest rate derivative instruments held by the entity at the reporting date.

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The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Long-Term Debt - Additional Information (Detail)						1 Months Ended	3 Months Ended	6 Months Ended
Long-Term Debt - Additional Information (Detail)	Jul. 26, 2021 USD ($)	Jul. 14, 2021 USD ($)	Aug. 05, 2020 USD ($)	Jul. 29, 2020 USD ($)	Apr. 30, 2020 USD ($)	Jul. 31, 2021 USD ($)	Jun. 30, 2020 USD ($) Swap	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($) Swap	Aug. 05, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 10, 2020 USD ($)
Debt Instrument [Line Items]
Long-term debt								$ 2,212,126,000			$ 2,219,878,000
Outstanding letters of credit								20,500,000
Aggregate principal amount outstanding								50,000,000.0
Repayments of long term debt								7,752,000	$ 7,752,000
Interest Rate Swaps [Member]
Debt Instrument [Line Items]
Number of interest rate swaps held \| Swap							5		5
Notional amount of interest rate swap							$ 1,000,000,000.0		$ 1,000,000,000.0
Maturity of interest rate swap							May 14, 2020
Subsequent Event
Debt Instrument [Line Items]
Redeemable percentage						103.00%
First-Priority Senior Secured Notes [Member]
Debt Instrument [Line Items]
Long-term debt, maturity date					May 01, 2025
Private offering aggregate principal amount					$ 227,500,000
Debt instrument interest rate percentage					8.75%
Date of first required payment					Nov. 02, 2020
Redemption description					On or after May 1, 2022, SEA may redeem the Senior Notes at its option, in whole at any time or in part from time to time, plus accrued and unpaid interest, if any, to, but excluding, the redemption date, if redeemed during the 12-month period commencing on May 1 of the years as follows: (i) in 2022 at 104.375%; (ii) in 2023 at 102.188%; and (iii) in 2024 and thereafter at 100%. SEA may also redeem in the aggregate (at a redemption price expressed as a percentage of principal amount thereof): (i) 100% of the Senior Notes after certain events constituting a change of control at a redemption price of 101%, plus accrued and unpaid interest, if any, to, but excluding, the redemption date and (ii) up to 40% of the original aggregate principal amount of the Senior Notes with amounts equal to the net cash proceeds of certain equity offerings at a redemption price of 108.750%, plus accrued and unpaid interest, if any, to, but excluding, the redemption date.
Percentage of interest in subsidiary					100.00%
First-Priority Senior Secured Notes [Member] \| In year 2022 [Member]
Debt Instrument [Line Items]
Redemption percentage					104.375%
First-Priority Senior Secured Notes [Member] \| In year 2023 [Member]
Debt Instrument [Line Items]
Redemption percentage					102.188%
First-Priority Senior Secured Notes [Member] \| In year 2024 and thereafter [Member]
Debt Instrument [Line Items]
Redemption percentage					100.00%
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt								$ 227,500,000			$ 227,500,000
Debt instrument interest rate percentage								8.75%			8.75%
Discount initially recorded							$ 7,500,000		7,800,000
Second-Priority Senior Secured Notes [Member]
Debt Instrument [Line Items]
Long-term debt, maturity date			Aug. 01, 2025
Private offering aggregate principal amount			$ 500,000,000.0
Debt instrument interest rate percentage			9.50%
Date of first required payment			Feb. 01, 2021
Redemption description			On or after February 1, 2022, SEA may redeem the Second-Priority Senior Notes at its option, in whole at any time or in part from time to time, plus accrued and unpaid interest, if any, to, but excluding, the redemption date, if redeemed during the 12-month period commencing on February 1 of the years as follows: (i) in 2022 at 104.75%; (ii) in 2023 at 102.375%; and (iii) in 2024 and thereafter at 100%. SEA may also redeem in the aggregate (at a redemption price expressed as a percentage of principal amount thereof): (i) 100% of the Second-Priority Senior Notes after certain events constituting a change of control at a redemption price of 101%, plus accrued and unpaid interest, if any, to, but excluding, the redemption date and (ii) up to 40% of the original aggregate principal amount of the Second-Priority Senior Notes with amounts equal to the net cash proceeds of certain equity offerings at a redemption price of 109.50%, plus accrued and unpaid interest, if any, to, but excluding, the redemption date.
Percentage of Notes Redeemable after change of control			100.00%
Repayments of long term debt		$ 50,000,000.0
Second-Priority Senior Secured Notes [Member] \| Subsequent Event
Debt Instrument [Line Items]
Redeemable percentage	100.00%
Aggregate Principal Amount Redeemed	$ 400,000,000.0					$ 50,000,000.0
Aggregate Principal Amount Partially Redeemed	$ 50,000,000.0
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed	103.00%
Debt Instrument, Redemption Period, End Date	Aug. 25, 2021
Second-Priority Senior Secured Notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Percentage of Notes Redeemable			40.00%
Second-Priority Senior Secured Notes [Member] \| In year 2022 [Member]
Debt Instrument [Line Items]
Redemption description			At any time prior to February 1, 2022, SEA may, (i) during the twelve month period commencing on the issue date and (ii) during the period subsequent to such twelve month period and prior to February 1, 2022, redeem in each period up to 10.0% of the initial aggregate principal amount of the Second-Priority Senior Notes at a redemption price equal to 103% of the aggregate principal amount of the Second-Priority Senior Notes to be redeemed plus accrued and unpaid interest, if any, to but excluding the redemption date; provided, that if SEA does not redeem 10.0% of the initial aggregate principal amount of Second-Priority Senior Notes during the twelve month period commencing on the issue date, SEA may, in the subsequent period prior to February 1, 2022, redeem the Second-Priority Senior Notes in an amount that does not exceed 10.0% of the initial aggregate principal amount plus the difference between (x) 10.0% of the initial aggregate principal amount and (y) the aggregate principal amount of Second-Priority Senior Notes that were redeemed in such twelve month period
Redemption percentage			104.75%
Initial aggregate principal amount, allowable redeemable percentage			10.00%
Redeemable percentage			103.00%
Second-Priority Senior Secured Notes [Member] \| In year 2023 [Member]
Debt Instrument [Line Items]
Redemption percentage			102.375%
Second-Priority Senior Secured Notes [Member] \| In year 2024 and thereafter [Member]
Debt Instrument [Line Items]
Redemption percentage			100.00%
Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Cash paid for interest								$ 58,300,000	$ 36,500,000
Term B-5 Loans [Member]
Debt Instrument [Line Items]
Long-term debt								$ 1,484,626,000			$ 1,492,378,000
Long-term debt, maturity date								Mar. 31, 2024
Percent of original principal amount on effective date used to calculate aggregate annual amounts which will amortize in equal quarterly installments								1.015%
Redemption Price One [Member] \| First-Priority Senior Secured Notes [Member]
Debt Instrument [Line Items]
Redemption percentage					101.00%
Redemption Price One [Member] \| Second-Priority Senior Secured Notes [Member]
Debt Instrument [Line Items]
Redemption percentage			101.00%
Redemption Price Two [Member] \| First-Priority Senior Secured Notes [Member]
Debt Instrument [Line Items]
Redemption percentage					108.75%
Redemption Price Two [Member] \| Second-Priority Senior Secured Notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Redemption percentage			109.50%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Senior secured revolving								$ 332,500,000				$ 210,000,000.0
Long-term debt, maturity date								Oct. 31, 2023
Long term debt, outstanding amount								$ 312,000,000.0
Revolving Credit Facility [Member] \| Second-Priority Senior Secured Notes [Member]
Debt Instrument [Line Items]
Long term debt, outstanding amount			$ 311,000,000.0
Seven-Year Senior Secured First Lien Term Loan Facility [Member] \| Subsequent Event
Debt Instrument [Line Items]
Credit facility										$ 1,100,000,000
Five-Year Secured First Lien Revolving Credit Facility [Member] \| Subsequent Event
Debt Instrument [Line Items]
Credit facility										$ 385,000,000.0
Restrictive Covenants [Member] \| Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
First lien secured net leverage ratio				6.25%
Restrictive covenants, description				The Revolving Credit Facility requires that the Company comply with a springing maximum first lien secured leverage ratio of 6.25x to be tested as of the last day of any fiscal quarter, solely to the extent that on such date the aggregate amount of funded loans and letters of credit (excluding undrawn letters of credit in an amount not to exceed $30.0 million and cash collateralized letters of credit) under the Revolving Credit Facility exceeds an amount equal to 35% of the then outstanding commitments under the Revolving Credit Facility. Pursuant to Amendment No. 12, among other terms, SEA is exempt from complying with its first lien secured leverage ratio covenant through the end of 2021, after which SEA will be required to comply with such covenant starting in the first quarter of 2022. For purposes of calculating compliance with such covenant, unless a Triggering Event occurs (as defined in Amendment No. 12), beginning with the first quarter of 2022, to the extent trailing Adjusted EBITDA (as defined in Amendment No. 12) for the second, third or fourth quarters of 2021 would have otherwise been included in the calculation of such covenant, in lieu of using actual Adjusted EBITDA for such periods, Adjusted EBITDA (as defined in Amendment No.12) for such applicable periods will be deemed to be actual Adjusted EBITDA for the corresponding quarter of 2019.
Liquidity test commitment				$ 75,000,000.0
Restrictive Covenants [Member] \| Senior Secured Credit Facilities [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Excludable letters of credit under maximum required first lien secured leverage ratio				$ 30,000,000.0
Restrictive Covenants [Member] \| Senior Secured Credit Facilities [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Minimum percentage of funded loan and letters of credit for covenant to apply				35.00%