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Investments in Unconsolidated Joint Ventures (Details Textual) (USD $)	3 Months Ended	6 Months Ended		3 Months Ended
	May 31, 2011	May 31, 2012	May 31, 2011	May 31, 2011 South Edge [Member]	Feb. 28, 2011 South Edge [Member]
Investments In Unconsolidated Joint Ventures (Textual) [Abstract]
Loss on loan guaranty	$ 14,572,000		$ 37,330,000	$ 14,600,000	$ 22,800,000
Investments in Unconsolidated Joint Ventures (Additional Textual) [Abstract]
Equity in loss of unconsolidated joint ventures including pretax, noncash impairment charges		$ 0	$ 53,700,000

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Loss on loan guaranty.

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Noncash impairment charges included in equity in loss of unconsolidated joint ventures.

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