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Long-Term Debt - Additional Information (Detail)						12 Months Ended
Long-Term Debt - Additional Information (Detail)	Jun. 09, 2022 USD ($)	Aug. 25, 2021 USD ($)	Jul. 14, 2021 USD ($)	Aug. 05, 2020 USD ($)	Apr. 30, 2020 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) Swap
Debt Instrument [Line Items]
Senior debt		$ 725,000,000.0
Debt instrument interest rate percentage		5.25%
Percentage Of Note Redeemed		9.50%
Discount recorded							$ 12,000,000.0
Debt issuance costs							12,700,000
Payment to lenders							2,800,000	$ 13,800,000
Write-off of debt issuance costs and discounts							21,500,000
Discount initially recorded								$ 21,900,000
Interest Rate Swaps [Member]
Debt Instrument [Line Items]
Number of interest rate swaps held \| Swap								5
Notional amount of interest rate swap								$ 1,000,000,000.0
Maturity of interest rate swap								May 14, 2020
Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Debt Instrument Redemption Description		In addition, the Senior Secured Credit Facilities require the Company to prepay outstanding term loan borrowings, subject to certain exceptions, with:-beginning with the fiscal year ending on December 31, 2022, 50% (which percentage will be reduced to 25% and 0% if the Company satisfies certain net first lien senior secured leverage ratios) of annual excess cash flow, as defined under the Senior Secured Credit Facilities;-100% of the net cash proceeds of all non-ordinary course asset sales or other non-ordinary course dispositions of property, in each case subject to certain exceptions and reinvestment rights;-100% of the net cash proceeds of any issuance or incurrence of debt, other than proceeds from debt permitted under the Senior Secured Credit Facilities.
Letter of credit participation fees						0.125%
Cash paid for interest						$ 110,900,000	116,100,000	$ 73,700,000
Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date		Aug. 15, 2029
Senior debt		$ 725,000,000.0
Debt instrument interest rate percentage		5.25%				5.25%
Redemption percentage		100.00%
Debt Instrument Redemption Description		On or after August 15, 2024, SEA may redeem the Senior Notes, 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 August 15 of the years as follows: (i) in 2024 at 102.625%; (ii) in 2025 at 101.313%; and (iii) in 2026 and thereafter at 100%. In addition, prior to August 15, 2024, SEA may redeem the Senior Notes at its option, in whole at any time or in part from time to time, at a redemption price equal to 100% of the principal amount of the Senior Notes redeemed, plus the “Applicable Premium” and accrued and unpaid interest, if any, to, but excluding, the redemption date. Notwithstanding the foregoing, subject to the provisions set forth in the Indenture, at any time and from time to time on or prior to August 15, 2024, SEA may redeem in the aggregate up to 40% of the original aggregate principal amount of the Senior Notes (calculated after giving effect to any issuance of additional Senior Notes) in an aggregate amount equal to the net cash proceeds of one or more equity offerings at a redemption price equal to 105.250%, plus accrued and unpaid interest, if any, to, but excluding, the redemption date. Additionally, upon the occurrence of specified change of control events, each holder will have the right to require SEA to repurchase all or any part of such holder’s notes at a purchase price in cash equal to 101%.
Interest accrue on senior notes		5.25%
Initial aggregate principal amount, allowable redeemable percentage		40.00%
Equity offerings at redemption price		105.25%
Percentage Of notes redeemable after change of control		101.00%
Senior Notes [Member] \| Debt Instrument Redemption Period One [Member]
Debt Instrument [Line Items]
Redemption percentage		102.625%
Senior Notes [Member] \| Debt Instrument Redemption Period Two [Member]
Debt Instrument [Line Items]
Redemption percentage		101.313%
Senior Notes [Member] \| Debt Instrument Redemption Period Three [Member]
Debt Instrument [Line Items]
Redemption percentage		100.00%
First-Priority Senior Secured Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date					May 01, 2025
Senior debt					$ 227,500,000
Debt instrument interest rate percentage					8.75%
Debt Instrument Redemption Description					SEA may redeem the First-Priority Senior Secured 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 First-Priority Senior Secured 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 First-Priority Senior Secured 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] \| Debt Instrument Redemption Period One [Member]
Debt Instrument [Line Items]
Redemption percentage					104.375%
First-Priority Senior Secured Notes [Member] \| Debt Instrument Redemption Period Two [Member]
Debt Instrument [Line Items]
Redemption percentage					102.188%
First-Priority Senior Secured Notes [Member] \| Debt Instrument Redemption Period Three [Member]
Debt Instrument [Line Items]
Redemption percentage					100.00%
Second-Priority Senior Secured Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date				Aug. 01, 2025
Senior debt				$ 500,000,000.0
Debt instrument interest rate percentage				9.50%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Amount borrowed subsequent to year end						$ 20,000,000.0
Outstanding letters of credit						18,400,000
Long term debt, outstanding amount						$ 371,600,000
Incremental amendment to revolving facility commitments	$ 5,000,000.0
Revolving Credit Facility [Member] \| Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date		Aug. 25, 2026
Amount borrowed subsequent to year end	$ 390,000,000.0	$ 385,000,000.0
Commitment fee payable by the company						0.50%
Revolving Credit Facility [Member] \| Second-Priority Senior Secured Notes [Member]
Debt Instrument [Line Items]
Long term debt, outstanding amount				$ 311,000,000.0
Restrictive Covenants [Member]
Debt Instrument [Line Items]
Total net leverage ratio not to be exceeded						425.00%
Restrictive Covenants [Member] \| Debt Agreement [Member]
Debt Instrument [Line Items]
Total net leverage ratio, as calculated						278.00%
Maximum [Member] \| Restrictive Covenants [Member] \| Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Credit facility agreement maximum required first lien secured leverage ratio						625.00%
Excludable letters of credit under maximum required first lien secured leverage ratio						$ 30,000,000.0
Minimum [Member] \| Restrictive Covenants [Member] \| Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Credit facility agreement maximum required first lien secured leverage ratio						100.00%
Minimum percentage of funded loan and letters of credit for covenant to apply						35.00%
Restatement Agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Senior secured financing		1,585,000,000.0
Term B Loans [Member]
Debt Instrument [Line Items]
Aggregate principal amount drawn		$ 1,200,000,000.0
Debt instrument, maturity date		Aug. 25, 2028
Term B Loans [Member] \| Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Debt Instrument Redemption Description						Borrowings under the Term B Loans bear interest at a fluctuating rate per annum equal to, at the Company’s option, (i) a base rate equal to the higher of (a) the federal funds rate plus 1/2 of 1%, (b) the rate of interest quoted in the print edition of the Wall Street Journal, Money Rates Section as the prime rate as in effect from time to time and (c) one-month Adjusted LIBOR plus 1% per annum (provided that in no event shall such ABR rate with respect to the Term B Loans be less than 1.50% per annum) (“ABR”), in each case, plus an applicable margin of 2.00% or (ii) a LIBOR rate for the applicable interest period (provided that in no event shall such LIBOR rate with respect to the Term B Loans be less than 0.50% per annum) (“LIBOR”) plus an applicable margin of 3.00%.
Amortization Payments Of Term Loan						0.25%
Partial Redemption [Member]
Debt Instrument [Line Items]
Redemption of Second-Priority senior secured notes			$ 50,000,000.0
Redemption percentage			103.00%
Full Redemption [Member]
Debt Instrument [Line Items]
Redemption of Second-Priority senior secured notes		$ 400,000,000.0
Redemption percentage		100.00%
Premium paid on redemption of Second-Priority senior secured notes							$ 34,300,000
Revolving Loans [Member] \| Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Debt Instrument Redemption Description						Borrowings of the Revolving Loans bear interest at a fluctuating rate per annum equal to, at the Company’s option, (i) ABR (provided that in no event shall such ABR rate with respect to the Revolving Loans be less than 1.00% per annum) plus an applicable margin equal to 1.75% or (ii) LIBOR (provided that in no event shall such LIBOR rate with respect to the Revolving Loans be less than 0.00%) plus an applicable margin of 2.75%. The applicable margin for borrowings of Revolving Loans are subject to one 25 basis point step-down upon achievement by the Company of certain corporate credit ratings, which was achieved during 2022.
Redemption Price One [Member] \| First-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%