Fair Value Measurements Cash Flow Model Critical Assumptions (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Monthly Sales Absorption Pace Per Community [Abstract]
Historical Monthly Sales Absorption Pace	2.1	1.7
Discount Rate Used in Determining Fair Value of Investments in Unconsolidated LLCs [Abstract]
Discount Rate Used in Determining Fair Value of Investments in Unconsolidated LLCs	16.00%
2013 [Member]
Statement [Line Items]
Weighted Average Increase of Assumed Costs	1.00%
Weighted Average Sales Price Increase	1.00%
2014 and beyond [Member]
Statement [Line Items]
Weighted Average Increase of Assumed Costs	2.00%
Weighted Average Sales Price Increase	2.00%