Subsequent Events - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified						0 Months Ended	1 Months Ended			1 Months Ended						1 Months Ended				1 Months Ended		1 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Senior Notes [Member] Prior to December 1, 2014 [Member]	Mar. 31, 2013 Senior Notes [Member] Equity Offering [Member] Prior to December 1, 2014 [Member]	Mar. 31, 2013 Revolving credit agreement [Member]	Apr. 07, 2013 Subsequent Events [Member]	Apr. 18, 2013 Subsequent Events [Member]	Apr. 24, 2013 Subsequent Events [Member]	Apr. 19, 2013 Subsequent Events [Member] 2013 Omnibus Incentive Plan [Member]	Apr. 19, 2013 Subsequent Events [Member] 2013 Omnibus Incentive Plan [Member] Restricted Stock [Member]	Apr. 24, 2013 Subsequent Events [Member] Initial public offering [Member]	Apr. 24, 2013 Subsequent Events [Member] Initial Public Offering Over-Allotment [Member]	Apr. 24, 2013 Subsequent Events [Member] Senior Notes [Member] Initial public offering [Member]	Apr. 24, 2013 Subsequent Events [Member] Senior Notes [Member] Equity Offering [Member]	Apr. 24, 2013 Subsequent Events [Member] Senior Notes [Member] Equity Offering [Member] Prior to December 1, 2014 [Member]	Apr. 24, 2013 Subsequent Events [Member] Term Loan B [Member] Initial public offering [Member]	Apr. 24, 2013 Subsequent Events [Member] Fourth Supplemental Indenture [Member]	May 14, 2013 Subsequent Events [Member] Revolving credit agreement [Member]	Apr. 24, 2013 Subsequent Events [Member] Amendment Four [Member]	May 14, 2013 Subsequent Events [Member] Term B-2 Loan [Member]	May 14, 2013 Subsequent Events [Member] Term B-2 Loan [Member] Federal Funds Rate [Member]	May 14, 2013 Subsequent Events [Member] Term B-2 Loan [Member] Base Rate Loan [Member]	May 14, 2013 Subsequent Events [Member] Term B-2 Loan [Member] LIBOR Rate Loan [Member]
Subsequent Event [Line Items]
Stock split description						On April 7, 2013, the Company's Board of Directors authorized an eight-for-one split of the Company's common stock which was effective on April 8, 2013. The Company's historical share and per share information has been retroactively adjusted to give effects to this stock split.
Stock split conversion ratio						8
Common stock, par value	$ 0.01	$ 0.01				$ 0.01
Common stock, shares authorized	1,000,000,000	1,000,000,000				1,000,000,000
Preferred stock, shares authorized						100,000,000
Preferred stock, par value						$ 0.01
Shares of common stock issued through initial public offering, per share											$ 27.00
Shares of common stock issued through initial public offering, shares											10,000,000
Shares offered and sold by the selling shareholders											19,900,000	3,900,000
Net proceeds received from offering											$ 245,400
Net proceeds received used to redeem 11% Senior Notes													140,000
Senior note redemption aggregate price percentage			100.00%	111.00%											111.00%
Senior Notes redemption terms											A provision in the indenture governing the Senior Notes that permits the Company to redeem up to 35% of the aggregate principal amount of the Senior Notes with the net cash proceeds of certain equity offerings.
Senior note redemption percentage				35.00%										35.00%
Payment made to affiliate for termination of advisory agreement											46,300
Net proceeds received from offering																37,000
Common stock reserved for future issuance									15,000,000
Restricted stock granted to directors, officers and employees										494,557
Number of shares of the Company's common stock received from the Partnerships by certain directors, officers, employees, and consultants in exchange for Class D and Employee Units surrended to the Partnerships							4,165,861
Increase in additional borrowings the Company can incur under its Senior Secured Credit Facilities as provided by the Fourth Supplemental Indenture to the Senior Notes																	20,000
Maximum termination fee payment allowed for the advisory agreement termination																	50,000
Senior secured revolving credit facility, existing					172,500														192,500
Payment of termination fee to related party								46,300
Aggregate principal amount of debt instrument																				1,405,000
Interest rate, description																				Borrowings under the Tranche B-2 Term Loans will 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 for the interest period relevant to such borrowing.
Margin for Term Loans																					0.50%	1.25%	2.25%
Floor rate																						1.75%	0.75%
Basis point step down in applicable margin																				The applicable margin for the Term B-2 Loans is subject to one 25 basis point step-down upon achievement of a certain leverage ratio.
Basis point step down on applicable margin upon achievement of certain leverage ratio																				25
Revolving Credit Facility in aggregate principal amount																		$ 350,000
Percent of original principal amount on effective date used to calculate aggregate annual amount which will amortize in equal quarterly installments																				1.00%
Term loan maturity date																				May 14, 2020
Maximum first lien secured net leverage ratio																				3.5