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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% |

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