Long-Term Debt - Additional Information (Detail) - USD ($) $ in Thousands					9 Months Ended
	Jun. 12, 2023	Jun. 09, 2022	Aug. 25, 2021	Apr. 30, 2020	Sep. 30, 2023	Sep. 30, 2022	Aug. 01, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Outstanding letters of credit					$ 18,400
Aggregate principal amount outstanding					$ 2,128,500			$ 2,137,500
Debt Instrument Redemption Period One [Member] | 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					$ 113,700	$ 82,400
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%
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%
Redemption percentage			100.00%
Aggregate principal amount outstanding					$ 725,000			$ 725,000
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
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
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.
Aggregate principal amount outstanding							$ 227,500
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
Debt Instrument [Line Items]
Redemption percentage				102.188%
First-Priority Senior Secured Notes [Member] | Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Redemption percentage				100.00%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Incremental amendment to revolving facility commitments		$ 5,000
Long term debt, outstanding amount					$ 371,600
Revolving Credit Facility [Member] | Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date			Aug. 25, 2026
Aggregate principal amount		$ 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					256.00%
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
Debt instrument, maturity date			Aug. 25, 2028
Aggregate principal amount outstanding					$ 1,176,000			$ 1,185,000
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 Term SOFR 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) 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 B Loans be less than 0.50% per annum) plus an applicable margin of 3.00%.
Amortization Payments of Term Loan			0.25%
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%