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Commitments and Contingencies (Details Textual) (USD $)
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1 Months Ended | ||||||||||||||
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Mar. 31, 2012
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Dec. 31, 2010
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Sep. 30, 2012
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Jun. 30, 2012
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Dec. 31, 2011
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Sep. 30, 2011
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Jun. 30, 2011
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Sep. 30, 2012
South Edge guarantee [Member]
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Dec. 31, 2011
South Edge guarantee [Member]
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Jun. 06, 2011
South Edge guarantee [Member]
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Oct. 26, 2011
South Edge [Member]
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| Loss Contingencies [Line Items] | |||||||||||||||
| Reserved for litigation and asserted claims | $ 16,177,000 | $ 10,157,000 | $ 8,720,000 | ||||||||||||
| Joint venture ownership percentage | 3.53% | ||||||||||||||
| Maximum pro rata exposure under the guarantee | 13,492,000 | 13,589,000 | 13,243,000 | [1] | 13,243,000 | [1] | 13,200,000 | ||||||||
| Number of co-ventures in joint venture | 4 | ||||||||||||||
| Commitments and Contingencies (Textual) [Abstract] | |||||||||||||||
| Warranty reserve | 29,265,000 | 22,973,000 | 21,243,000 | 23,136,000 | 26,075,000 | 25,929,000 | |||||||||
| Number of lenders filing petition for involuntary bankruptcy | 3 | ||||||||||||||
| Amount requested in demand for arbitration related to alleged breaches | 13,500,000 | ||||||||||||||
| Additional amount requested in demand for arbitration related to pro rata future infrastructure improvement costs | $ 9,800,000 | ||||||||||||||
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