Long-Term Debt - Additional Information (Detail) (USD $)	6 Months Ended			6 Months Ended		6 Months Ended											0 Months Ended	6 Months Ended				0 Months Ended	6 Months Ended			0 Months Ended	6 Months Ended				6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Revolving Credit Agreement [Member]	Dec. 31, 2013 Revolving Credit Agreement [Member]	Jun. 30, 2014 Base Rate Loan [Member] Revolving Credit Agreement [Member]	Jun. 30, 2014 LIBOR Rate Loan [Member] Revolving Credit Agreement [Member]	Jun. 30, 2014 Interest Rate Swaps [Member] Swap	May 14, 2013 Interest Rate Swaps [Member] Swap	Aug. 23, 2012 Interest Rate Swaps [Member] Swap	Jun. 30, 2014 Interest Rate Swaps [Member] Minimum [Member]	Jun. 30, 2014 Interest Rate Swaps [Member] Maximum [Member]	May 14, 2013 Interest Rate Swap One [Member]	Aug. 23, 2012 Interest Rate Swap One [Member]	May 14, 2013 Interest Rate Swap Two [Member]	Aug. 23, 2012 Interest Rate Swap Two [Member]	Apr. 24, 2013 Senior Notes [Member]	Jun. 30, 2014 Senior Notes [Member]	Dec. 31, 2013 Senior Notes [Member]	Apr. 24, 2013 Senior Notes [Member]	Dec. 01, 2009 Senior Notes [Member]	Apr. 24, 2013 Senior Notes [Member] Prior to December 1, 2014 [Member]	Jun. 30, 2014 Senior Notes [Member] Prior to December 1, 2014 [Member]	Jun. 30, 2014 Senior Notes [Member] On or After December 1, 2014 [Member]	Jun. 30, 2014 Senior Notes [Member] On or After December 1, 2015 [Member]	Apr. 24, 2013 Term B Loan [Member]	Jun. 30, 2014 Term B-2 Loans [Member]	Dec. 31, 2013 Term B-2 Loans [Member]	May 14, 2013 Term B-2 Loans [Member]	Dec. 01, 2009 Term B-2 Loans [Member]	Jun. 30, 2014 Term B-2 Loans [Member] Federal Funds Rate [Member]	Jun. 30, 2014 Term B-2 Loans [Member] Base Rate Loan [Member]	Jun. 30, 2014 Term B-2 Loans [Member] LIBOR Rate Loan [Member]	Mar. 31, 2014 Term B-2 Loans [Member] Interest Rate Swaps [Member]
Debt Instrument [Line Items]
Debt instrument, balance (In USD)																					$ 400,000,000									$ 1,405,000,000
Long-term debt, maturity date				Apr. 24, 2018														Dec. 01, 2016									May 14, 2020
Repayment of portion of Term Loan B (In USD)																										37,000,000
Repayment of Senior Notes (In USD)																	140,000,000
Redemption price for Senior Notes																				111.00%
Deferred financing costs, net (In USD)	29,430,000		32,317,000
Long-term debt	1,650,950,000		1,657,975,000															260,000,000	260,000,000								1,390,950,000	1,397,975,000
Senior secured revolving credit facility, maximum borrowing capacity (in USD)				192,500,000
Number of days used to calculate maturity				91 days
Amount aggregate principal outstanding must be greater than to use the corresponding instrument's maturity date (in USD)																		50,000,000
Senior secured revolving credit facility, maturity date, description				The Revolving Credit Facility will mature on the earlier of (a) April 24, 2018 and (b) the 91st day prior to the earlier of (1) the maturity date of Senior Notes with an aggregate principal amount greater than $50,000 outstanding and (2) the maturity date of any indebtedness incurred to refinance any of the term loans or the Senior Notes.
Interest rate, description																											Borrowings under the Secured Credit Facilities bear interest, at SEA’s option, at a rate equal to a margin over either (a) a base rate determined by reference to the higher of (1) the Bank of America’s prime lending rate and (2) the federal funds effective rate plus 1/2 of 1% or (b) a LIBOR rate determined by reference to the British Bankers Association (“BBA”) LIBOR rate, or the successor thereto if the BBA is no longer making a LIBOR rate available, for the interest period relevant to such borrowing.
Applicable margin for Term Loans						1.75%	2.75%																								0.50%	1.25%	2.25%
Floor rate																																1.75%	0.75%
Basis point step-down in applicable margin, description				The applicable margin for borrowings under the Revolving Credit Facility is 1.75%, in the case of base rate loans, and 2.75%, in the case of LIBOR rate loans. The applicable margin (under either a base rate or LIBOR rate) is subject to one 25 basis point step-down upon achievement by SEA of certain corporate credit ratings.																							The applicable margin for the Term B-2 Loans (under either a base rate or LIBOR rate) is subject to one 25 basis point step-down upon achievement by SEA of a certain total leverage ratio.
Basis point step down on applicable margin upon achievement of certain leverage ratio				0.25%																							0.25%
Effective interest rate	3.00%			2.50%
Line of credit facility, amount outstanding (In USD)				0	0
Percent of original principal amount on effective date used to calculate aggregate annual amount which will amortize in equal quarterly installments																													1.00%
Permitted increased commitments under the Revolving Credit Facility in aggregate principal amount				350,000,000
Maximum first lien secured net leverage ratio	3.50
Outstanding letters of credit (In USD)	16,100,000
Letters of credit available amount (In USD)				176,400,000
Debt instrument, interest rate																		11.00%
Redemption price for Senior Notes percentage																						111.00%	100.00%	105.50%	102.75%
Percentage of Senior Notes principle amount used to calculate Applicable Premium																							1.00%
Redemption of Senior Notes, description																		Prior to December 1, 2014, SEA may redeem some or all of the Senior Notes at a price equal to 100% of the principal amount of the Senior Notes redeemed plus the Applicable Premium as of, and accrued and unpaid interest to the redemption date, subject to the right of the holders of record on the relevant record date to receive interest due on the relevant interest payment date. The “Applicable Premium” is defined as the greater of (1) 1.0% of the principal amount of the Senior Notes and (2) the excess, if any, of (a) the present value at such redemption date of (i) the redemption price of the Senior Notes at December 1, 2014 plus (ii) all required interest payments due on the Senior Notes through December 1, 2014 (excluding accrued but unpaid interest to the redemption date), computed using a discount rate equal to the Treasury Rate plus 50 basis points over (b) the principal amount of the Senior Notes.
Basis points over the principal balance of the Senior Notes																							0.50%
Number of interest rate swap held								3	2	2
Notional amount of interest rate swap (In USD)								1,000,000,000	550,000,000	550,000,000			275,000,000	275,000,000	275,000,000	275,000,000																		450,000,000
Maturity of interest rate swap								Sep. 30, 2016
Fixed rate of interest on swaps										1.247%	1.049%	1.051%
Variable rate of interest								0.75%
Cash paid for interest (In USD)	$ 37,355,000	$ 47,881,000