Commitments and Contingencies (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Capital_Leases Venture Partner	Dec. 31, 2010	Dec. 31, 2009	Jun. 21, 2011 acre sqft Room MM	Sep. 03, 2008 acre mi
Commitments and contingencies (Textual) [Abstract]
Number of capital leases entered into during year	1
Distance from downtown Phoenix of land under land purchase agreement					30
Distance to land under agreement				25
Amount of real estate property under purchase agreement within 3200 acre Mesa proving grounds					100
Number of acres to develop a resort and convention hotel in Aurora				85
Project expected cost approximately				$ 800
Expected guest rooms at resort and convention development.				1,500
Expected exhibition and meeting space at resort and convention development, in sq ft				400,000
Rental expense related to continuing operations for operating leases	15.7	15.3	14.5
Non cash lease expense related to continuing operations	5.8	5.9	6.0
Percentage of employees represented by labor unions	14.00%
Number of joint ventures	2
Real Estate funds serving as joint venture partners	2
Osceola County [Member]
Commitments and Contingencies (Additional) (Textual) [Abstract]
Land area covered under operating lease agreement in acres	65.3
Operating lease agreement period	75 years
Percentage of escalation of base rent	3.00%
Annual base payment for operating lease	3.5
Base rent year	2007
Annual base lease expense for operating lease	9.4	9.4	9.4
Contingent rentals	1.4	1.5	1.5
Expiration date of lease under extension	Jan. 31, 2101
Corporate Joint Venture [Member]
Commitments and Contingencies (Additional) (Textual) [Abstract]
Maximum potential amount liable under contribution agreement	23.8
Total debt subject to guarantees	$ 121.2