Commitments and Contingencies (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended				3 Months Ended
	Dec. 31, 2011 Venture Partner	Jan. 31, 2012	Jun. 21, 2011 sqft Room MM acre	Sep. 03, 2008 mi acre	Mar. 31, 2012 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
Commitments and contingencies (Textual) [Abstract]
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
Number of joint ventures	2
Real Estate funds serving as joint venture partners	2
Ownership in joint venture		50.00%
Estimated amount of investment under project		$ 50