Variable Interest Entities ("VIEs") - Total Risk of Loss Related to Contract Land Deposits (Detail) $ in Thousands	Sep. 30, 2019 USD ($) lot	Dec. 31, 2018 USD ($) lot
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure [Abstract]
Contract land deposits	$ 432,494	$ 425,393
Loss reserve on contract land deposits	(27,644)	(29,216)
Contract land deposits, net	404,850	396,177
Contingent obligations in the form of letters of credit	4,520	3,923
Specific performance obligations	1,505	1,505
Total risk of loss	$ 410,875	$ 401,605
Finished lots committed to purchase under specific performance obligations | lot	10	10