Investments in Unconsolidated Joint Ventures (Details Textual) (USD $)	3 Months Ended
	Feb. 29, 2012	Feb. 28, 2011	Feb. 29, 2012 South Edge [Member]	Nov. 30, 2011 South Edge [Member]
Investments in Unconsolidated Joint Ventures (Additional Textual) [Abstract]
Outstanding debt of unconsolidated joint ventures			$ 0	$ 0
Investments In Unconsolidated Joint Ventures (Textual) [Abstract]
Equity in loss of unconsolidated joint ventures including pretax, noncash impairment charges	0	53,700,000
Loss on loan guaranty		$ 22,758,000