Long-Term Debt - Additional Information (Detail) - USD ($) $ in Thousands							12 Months Ended
	Jan. 22, 2024	Jun. 12, 2023	Jun. 09, 2022	Aug. 25, 2021	Jul. 14, 2021	Apr. 30, 2020	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Aug. 01, 2023	Aug. 05, 2020
Debt Instrument [Line Items]
Senior debt				$ 725,000
Debt instrument interest rate percentage				5.25%
Percentage Of Note Redeemed				9.50%
Discount recorded									$ 12,000
Debt issuance costs									12,700
Payment to lenders									2,800
Write-off of debt issuance costs and discounts									21,500
Long-term debt							$ 2,125,500	$ 2,137,500
Debt Instrument, Redemption, Period One | SOFR
Debt Instrument [Line Items]
Credit spread adjustment rate		0.11448%
Debt Instrument, Redemption, Period Two | SOFR
Debt Instrument [Line Items]
Credit spread adjustment rate		0.26161%
Debt Instrument, Redemption, Period Three | SOFR
Debt Instrument [Line Items]
Credit spread adjustment rate		0.42826%
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:-50% (which percentage will be reduced to 25% and 0% if the Company satisfies certain net first lien leverage ratios) of annual excess cash flow, as defined under the Senior Secured Credit Facilities;-100% (which percentage will be reduced to 50% and 0% if the Company satisfies certain net first lien leverage ratios) 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							$ 146,300	$ 110,900	116,100
Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date				Aug. 15, 2029
Senior debt				$ 725,000
Debt instrument interest rate percentage				5.25%			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%
Long-term debt							$ 725,000	$ 725,000
Senior Notes [Member] | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Redemption percentage				102.625%
Senior Notes [Member] | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Redemption percentage				101.313%
Senior Notes [Member] | Debt Instrument, Redemption, Period Three
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
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 2023 at 102.188%; and (ii) 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%
Long-term debt										$ 227,500
First-Priority Senior Secured Notes [Member] | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Redemption percentage						102.188%
First-Priority Senior Secured Notes [Member] | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Redemption percentage						100.00%
Second-Priority Senior Secured Notes [Member]
Debt Instrument [Line Items]
Senior debt											$ 500,000
Debt instrument interest rate percentage											9.50%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Outstanding letters of credit							18,400
Long term debt, outstanding amount							$ 371,600
Incremental amendment to revolving facility commitments			$ 5,000
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	$ 385,000
Commitment fee payable by the company							0.50%
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							253.00%
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
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
Term B Loans [Member]
Debt Instrument [Line Items]
Aggregate principal amount drawn				1,200,000
Long-term debt							$ 1,173,000	$ 1,185,000
Term B Loans [Member] | Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Amortization payments of term loan							0.25%
Term Loans [Member] | Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Debt Instrument Redemption Description							Borrowings under the Term 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 Term SOFR plus 1% per annum (provided that in no event shall such ABR rate with respect to the Term Loans be less than 1.50% per annum) (“ABR”), in each case, plus an applicable margin of 1.50% or (ii) an Adjusted Term SOFR rate for the applicable interest period (provided that in no event shall such Adjusted Term SOFR rate with respect to the Term Loans be less than 0.50% per annum) plus an applicable margin of 2.50%.
New Term Loans [Member]
Debt Instrument [Line Items]
Debt Instrument Redemption Description							Borrowings under the Term Loans bear interest at a fluctuating rate per annum equal to, at SEA’s option, (i) ABR (provided that in no event shall such ABR rate with respect to the Term Loans be less than 1.50% per annum) plus an applicable margin equal to 1.50% or (ii) Adjusted Term SOFR (provided that in no event shall such Adjusted Term SOFR rate with respect to the Term Loans be less than 0.50%) plus an applicable margin equal to 2.50%.
New Term Loans [Member] | Subsequent Events
Debt Instrument [Line Items]
Debt instrument, maturity date	Aug. 25, 2028
Amount borrowed subsequent to year end	$ 1,173,000
Partial Redemption [Member]
Debt Instrument [Line Items]
Redemption of Second-Priority senior secured notes					$ 50,000
Redemption percentage					103.00%
Full Redemption [Member]
Debt Instrument [Line Items]
Redemption of Second-Priority senior secured notes				$ 400,000
Redemption percentage				100.00%
Premium paid on redemption of Second-Priority senior secured notes									$ 34,300
Revolving Loans [Member] | Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Debt Instrument Redemption Description							Borrowings under 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) Adjusted Term SOFR (provided that in no event shall such Adjusted Term SOFR 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.
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%