Commitments and Contingencies (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended		61 Months Ended		3 Months Ended	50 Months Ended	3 Months Ended		24 Months Ended	3 Months Ended				3 Months Ended	12 Months Ended
	Mar. 31, 2013 item	Nov. 15, 2003 Domestic	Nov. 15, 2002 Domestic	Dec. 30, 2008 Domestic	Mar. 31, 2013 Domestic time	Mar. 31, 2013 Domestic and Canada	Dec. 31, 2008 Domestic and Canada	Mar. 31, 2013 Multi-layered general liability policies	Mar. 31, 2013 Workers' compensation claims	Nov. 15, 2003 Workers' compensation claims	Mar. 31, 2013 Information security and privacy liability insurance policy	Mar. 31, 2013 HWP Guarantee	Nov. 05, 2007 HWP Guarantee	Feb. 28, 2006 HWP Guarantee	Mar. 31, 2013 Personal injury due to altercation individual	Dec. 31, 2012 Tax and other contingencies item	Mar. 31, 2013 Tax and other contingencies
Insurance
Excess liability coverage per occurrence								$ 100.0
Self-insured retention per occurrence		2.00	1.00	2.50							0.25
Number of times additional self-insured retention taken					1
Additional one time self-insured retention						0.5	0.5
Deductible per occurrence applicable to all claims in the policy year						2.00			0.75	0.50
Insurance value maintained											10.0
Litigation
Number of actions that would be material to consolidated financial position	0
Numbers of individuals who allegedly participated in the altercation															4
HWP Guarantee
Payment guaranteed for construction term loan incurred by HWP														32.2
Ownership interest in the managing member of HWP (as a percent)												49.00%
Refinance of construction term loan with new term loan													33.0
Period in which the limited guarantee will be released												5 years
Amount of letter of credit as additional security for the loan												1.0
Tax and other contingencies
Accrued tax liabilities and indemnification contingencies																0.5	0.5
Number of large claims related to parks closed																2
Losses from discontinued operations recovered																$ 7.3