Long-Lived Assets (Details) (California's Great America [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2010
California's Great America [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Fixed-asset impairment	$ 62.0

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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+ Details