Long-Term Debt - Additional Information (Detail) (USD $)	9 Months Ended			9 Months Ended			9 Months Ended		9 Months Ended											0 Months Ended	9 Months Ended				0 Months Ended	9 Months Ended			0 Months Ended	9 Months Ended					9 Months Ended					9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Revolving Credit Agreement [Member]	Sep. 30, 2013 Revolving Credit Agreement [Member]	Dec. 31, 2013 Revolving Credit Agreement [Member]	Sep. 30, 2014 Senior Secured Credit Facilities [Member]	Sep. 30, 2014 New Senior Secured Revolving Credit [Member]	Sep. 30, 2014 Base Rate Loan [Member] Revolving Credit Agreement [Member]	Sep. 30, 2014 LIBOR Rate Loan [Member] Revolving Credit Agreement [Member]	Sep. 30, 2014 Interest Rate Swaps [Member] Swap	May 14, 2013 Interest Rate Swaps [Member] Swap	Aug. 23, 2012 Interest Rate Swaps [Member] Swap	Sep. 30, 2014 Interest Rate Swaps [Member] Minimum [Member]	Sep. 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]	Sep. 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]	Sep. 30, 2014 Senior Notes [Member] Prior to December 1, 2014 [Member]	Sep. 30, 2014 Senior Notes [Member] On or After December 1, 2014 [Member]	Sep. 30, 2014 Senior Notes [Member] On or After December 1, 2015 [Member]	Apr. 24, 2013 Term B Loan [Member]	Sep. 30, 2014 Term B Loan [Member] Interest Rate Swaps [Member]	Sep. 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]	Sep. 30, 2014 Term B-2 Loans [Member] Federal Funds Rate [Member]	Sep. 30, 2014 Term B-2 Loans [Member] Base Rate Loan [Member]	Sep. 30, 2014 Term B-2 Loans [Member] LIBOR Rate Loan [Member]	Sep. 30, 2014 Term B-2 Loans [Member] Interest Rate Swaps [Member]	Mar. 31, 2014 Term B-2 Loans [Member] Interest Rate Swaps [Member]	Sep. 30, 2014 Restricted Covenants [Member]	Sep. 30, 2014 Restricted Covenants [Member] Senior Secured Credit Facilities [Member]	Sep. 30, 2014 Restricted Covenants [Member] Senior Notes [Member]	Sep. 30, 2014 Restricted Covenants [Member] Scenario One [Member]	Sep. 30, 2014 Restricted Covenants [Member] Scenario Two [Member]	Sep. 30, 2014 Restricted Covenants [Member] Scenario Three [Member]
Debt Instrument [Line Items]
Debt instrument, balance																								$ 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																													37,000,000
Repayment of Senior Notes																				140,000,000
Redemption price for Senior Notes																							111.00%
Deferred financing costs, net	21,788,000		27,453,000
Long-term debt	1,615,950,000		1,657,975,000																		260,000,000	260,000,000									1,355,950,000	1,397,975,000
Senior secured revolving credit facility outstanding								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																					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%
Percent of original principal amount on effective date used to calculate aggregate annual amount which will amortize in equal quarterly installments																																	1.00%
Voluntary principal repayment of term loans																															31,500,000
Permitted increased commitments under the Revolving Credit Facility in aggregate principal amount				350,000,000
First lien secured net leverage ratio							3.50
Outstanding letters of credit	16,100,000
Letters of credit available amount				176,400,000
Written off of debt issuance costs		8,100,000
Debt issuance costs					3,900,000
Capitalized fees		10,635,000
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%
Restrictive covenants, description	The Senior Secured Credit Facilities and the indenture governing the Senior Notes contain a number of covenants that, among other things, restrict SEA’s ability and the ability of its restricted subsidiaries to, among other things, make certain restricted payments (as defined in the applicable agreement), including dividend payments and share repurchases. In particular, the Senior Secured Credit Facilities and the indenture permit restricted payments in an aggregate amount per annum not to exceed the greater of (1) 6% of initial public offering net proceeds received by SEA or (2) (a) $90,000, so long as, on a pro forma basis (as defined in the applicable agreement) after giving effect to the payment of any such restricted payment, the Total Leverage Ratio, (as defined in the applicable agreement), is no greater than 5.00 to 1.00 and greater than 4.50 to 1.00, (b) $120,000, so long as, on a pro forma basis after giving effect to the payment of any such restricted payment, the Total Leverage Ratio is no greater than 4.50 to 1.00 and greater than 4.00 to 1.00, (c) the greater of (A) $120,000 and (B) 7.5% of market capitalization, so long as, on a pro forma basis after giving effect to the payment of any such restricted payment, the Total Leverage Ratio is no greater than 4.00 to 1.00 and greater than 3.50 to 1.00 and (d) an unlimited amount, so long as, on a pro forma basis after giving effect to the payment of any such restricted payment, the Total Leverage Ratio is no greater than 3.50 to 1.00.
Percentage of initial public offering net proceeds in restricted payments	6.00%
Restricted payment on Senior Secured Credit Facilities																																											90,000,000	120,000,000	120,000,000
Percentage of market capitalization on restricted payment	7.50%
Maximum Total Leverage Ratio																																											5.00	4.50	4.00
Minimum Total Leverage Ratio																																											4.50	4.00	3.50
Total Leverage Ratio																																									4.09	4.41
Restrictive covenants, restricted payments capacity available																																								120,000,000
Restrictive covenants, restricted payments capacity remaining																																								15,100,000
Restrictive covenants, restricted payments used																																								104,900,000
Number of interest rate swap held											3	2	2
Notional amount of interest rate swap											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																			Sep. 30, 2016								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	$ 49,133,000	$ 59,685,000