Variable Interest Entities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified				6 Months Ended
	Jun. 30, 2012 Land Option Contracts	Jun. 30, 2012 Land Option Contracts Loss Exposure	Dec. 31, 2011 Land Option Contracts Loss Exposure	Jun. 30, 2012 Affiliated Entity	Jun. 30, 2012 Third Party	Jun. 30, 2012 Baker Ranch	Dec. 31, 2011 Baker Ranch	Jun. 30, 2012 Unconsolidated Variable Interest Entities Land Option Contracts
Variable Interest Entity [Line Items]
VIEs ownership interest				50.00%	50.00%
Notes payable outstanding						$ 25.4	$ 25.4
Refundable and non-refundable cash deposits	18.5	24.0	14.2					6.0
Remaining purchase price of cash deposits	$ 173.9							$ 83.5