Investments in Unconsolidated Joint Ventures (Details 1) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2011	Nov. 30, 2010
Number of investments in unconsolidated joint ventures
Number of investments in unconsolidated joint ventures	7	10
Investments in unconsolidated joint ventures
Investments in unconsolidated joint ventures	$ 51,255	$ 105,583
Outstanding debt of unconsolidated joint ventures
Outstanding debt of unconsolidated joint ventures	327,900	327,900
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	327,856	327,856
Others [Member]
Number of investments in unconsolidated joint ventures
Number of investments in unconsolidated joint ventures	7	9
Investments in unconsolidated joint ventures
Investments in unconsolidated joint ventures	$ 51,255	$ 50,314