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Long-Term Debt - Additional Information (Detail)			3 Months Ended
Long-Term Debt - Additional Information (Detail)	Apr. 30, 2020 USD ($)	Apr. 19, 2020 USD ($)	Mar. 31, 2020 USD ($) Swap	Mar. 31, 2019 USD ($)	Mar. 10, 2020 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Long-term debt			$ 1,816,507,000			$ 1,557,883,000
Outstanding letters of credit			$ 19,900,000
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
Weighted average fixed interest rate			2.45%
Variable rate of interest			0.75%
Variable rate of interest, description			variable rate of interest based upon the greater of 0.75% or the BBA LIBOR
Senior Secured Notes [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Long-term debt, maturity date	May 01, 2025
Private offering aggregate principal amount	$ 227,500,000
Senior secured note stated 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%.
Percentage of interest in subsidiary	100.00%
Senior Secured Notes [Member] \| Subsequent Event [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Redeemable percentage	40.00%
Senior Secured Notes [Member] \| Subsequent Event [Member] \| In year 2022 [Member]
Debt Instrument [Line Items]
Redemption percentage	104.375%
Senior Secured Notes [Member] \| Subsequent Event [Member] \| In year 2023 [Member]
Debt Instrument [Line Items]
Redemption percentage	102.188%
Senior Secured Notes [Member] \| Subsequent Event [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			$ 18,300,000	$ 20,100,000
Term B-5 Loans [Member]
Debt Instrument [Line Items]
Long-term debt			$ 1,504,007,000			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%
Redemption Price One [Member] \| Senior Secured Notes [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Redemption percentage	101.00%
Redemption Price Two [Member] \| Senior Secured Notes [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Redemption percentage	108.375%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Senior secured revolving			$ 332,500,000		$ 210,000,000.0
Long-term debt			$ 312,500,000			$ 50,000,000
Long-term debt, maturity date			Oct. 31, 2023
Amount available for borrowing			$ 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. 11, among other terms, SEA will be exempt from complying with its first lien secured leverage ratio covenant for each of the second, third and fourth quarters of 2020, after which SEA will be required to comply with such covenants starting at the first quarter of 2021. For purposes of calculating compliance with such covenant, unless a Triggering Event occurs (as defined in Amendment No. 11), beginning with the first quarter of 2021, to the extent trailing Adjusted EBITDA (as defined in Amendment No. 11) for the second, third or fourth quarters of 2020 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 for the corresponding quarter of 2019.
Liquidity test commitment		$ 75,000,000.0
Total net leverage ratio, as calculated			389.00%
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%