Inventory - Narrative (Details) (USD $)			3 Months Ended
	Mar. 31, 2013 home	Sep. 30, 2012 home	Mar. 31, 2012 Minimum	Mar. 31, 2012 Maximum
Real Estate Properties [Line Items]
Number of substantially completed homes	111	174
Total value of substantially completed homes	$ 26,900,000	$ 39,700,000
Discount rate			13.40%	15.20%
Deposits and non-refundable preacquisition costs incurred	25,022,000	24,923,000
Total remaining purchase price committed under all options	$ 206,904,000	$ 198,498,000