Investments in Unconsolidated Joint Ventures (Details 1) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2011 Joint_Venture	Nov. 30, 2010 Joint_Venture
Number of investments in unconsolidated joint ventures
Number of investments in unconsolidated joint ventures	8	10
Investments in unconsolidated joint ventures
Investments in unconsolidated joint ventures	$ 127,926	$ 105,583
South Edge [Member]
Number of investments in unconsolidated joint ventures
Number of investments in unconsolidated joint ventures	0	1
Investments in unconsolidated joint ventures
Investments in unconsolidated joint ventures	0	55,269
Outstanding debt of unconsolidated joint ventures
Outstanding debt of unconsolidated joint ventures	0	327,856
Others [Member]
Number of investments in unconsolidated joint ventures
Number of investments in unconsolidated joint ventures	8	9
Investments in unconsolidated joint ventures
Investments in unconsolidated joint ventures	$ 127,926	$ 50,314