Commitments and Contingent Liabilities - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) lot contract	Dec. 31, 2016 USD ($) lot	Dec. 31, 2015 USD ($)
Commitments And Contingencies [Line Items]
Rent expense under operating leases	$ 49,400	$ 45,800	$ 48,100
Maximum range of deposits required under the purchase agreements	10.00%
Contingent forfeitable deposits with land developers	$ 137,900
Number of specific performance contracts | contract	1
Finished lots committed to purchase under specific performance obligations | lot	10	10
Purchase price of finished lots committed to purchase under specific performance obligations	$ 1,505	$ 1,505
Aggregate additional funding commitments related to raw land property development	7,900
Expected development credit offset amount	4,700
Contingent obligations under bonds or letters of credit arrangements	44,300
Credit Agreement
Commitments And Contingencies [Line Items]
Contingent obligations under letters of credit arrangements	$ 7,300