Commitments and Contingent Liabilities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Lot	Dec. 31, 2011 Lot	Dec. 31, 2010
Commitments And Contingencies [Line Items]
Rent expense under operating leases	$ 33,399	$ 33,607	$ 33,172
Maximum range of deposits required under the purchase agreements	10.00%
Term of business plan	5 years
Contingent forfeitable deposits with land developers	48,982
Finished lots committed to purchase under specific performance obligations	71	92
Purchase price of finished lots committed to purchase under specific performance obligations	7,000
Contingent obligations under bonds or letters of credit arrangements	47,100
Contingent obligations under letters of credit arrangements	$ 9,634