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Long-Term Debt - Additional Information (Detail)
3 Months Ended 9 Months Ended
Aug. 05, 2020
USD ($)
Apr. 30, 2020
USD ($)
Apr. 19, 2020
USD ($)
Sep. 30, 2020
USD ($)
Swap
Sep. 30, 2020
USD ($)
Swap
Sep. 30, 2019
USD ($)
Mar. 10, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                
Long-term debt       $ 2,223,754,000 $ 2,223,754,000     $ 1,557,883,000
Outstanding letters of credit       $ 21,200,000 $ 21,200,000      
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      
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. 01, 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 108.375%, 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%            
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.              
Redemption percentage 101.00%              
Percentage of Notes Redeemable after change of control 100.00%              
Second-Priority Senior Secured Notes [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Redemption percentage 109.50%              
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 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       $ 13,600,000 $ 21,400,000      
Second Priority Senior Notes [Member]                
Debt Instrument [Line Items]                
Debt instrument interest rate percentage       9.50% 9.50%      
Discount initially recorded       $ 13,600,000 $ 21,400,000      
Senior Secured Credit Facilities [Member]                
Debt Instrument [Line Items]                
Cash paid for interest         51,000,000.0 $ 61,200,000    
Term B-5 Loans [Member]                
Debt Instrument [Line Items]                
Long-term debt       $ 1,496,254,000 $ 1,496,254,000     1,507,883,000
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% 1.015%      
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   108.375%            
Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Senior secured revolving       $ 332,500,000 $ 332,500,000   $ 210,000,000.0  
Long-term debt               $ 50,000,000
Long-term debt, maturity date         Oct. 31, 2023      
Long term debt, outstanding amount       $ 311,300,000 $ 311,300,000      
Revolving Credit Facility [Member] | Second-Priority Senior Secured Notes [Member]                
Debt Instrument [Line Items]                
Long term debt, outstanding amount $ 311,000.0              
Restrictive Covenants [Member] | Senior Secured Credit Facilities [Member]                
Debt Instrument [Line Items]                
First lien secured net leverage ratio     625.00%          
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 will be 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 for such applicable periods will be deemed to be actual Adjusted EBITDA (as defined in Amendment No. 12) 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%