Homebuilding Accrued Liabilities and Financial Services Accounts Payable and Accrued Liabilities - Schedule of Financial Services Accounts Payable and Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Payables And Accruals [Abstract]
Insurance reserves	$ 48,949	$ 47,852	$ 44,724	$ 49,376
Other accrued liabilities	14,141	17,310
Total accounts payable and accrued liabilities	$ 54,540	$ 51,864