Chapter 11 Reorganization (Details)	1 Months Ended		1 Months Ended
Jun. 30, 2011	Apr. 30, 2010 Discharge of debt to holders of 2016 Notes	Apr. 30, 2010 Six Flags Entertainment Corporation (Holdings)
Common Stock
Common stock issued by Holdings (in shares)			54,777,778
Interest rate (as a percent)		12.25%
Stock split ratio	2

Number of new stock issued during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Principles Board Opinion (APB)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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