Joint Ventures - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) lot joint_venture	Dec. 31, 2019 USD ($) lot joint_venture	Dec. 31, 2018 USD ($)
Joint Ventures [Line Items]
Aggregate investment	$ 23,600	$ 26,700
Number of joint ventures | joint_venture	4	5
Expected production of finished lots | lot	5,200	6,300
Total lots controlled by company under the joint venture | lot	2,200	2,950
Total lots either under contract with unrelated parties or not under the current contract | lot	3,000	3,350
Additional funding commitments in the aggregate	$ 3,100	$ 4,300
Number of joint ventures with additional funding commitment | joint_venture		2
Equity Method Investment, Realized Gain (Loss) on Disposal	5,000
Distribution of capital from unconsolidated joint ventures	11,625	$ 8,247	$ 10,515
ProceedsFromEquityMethodInvestmentDividendsOrDistributionsTotalDistribution	13,100
Other Assets
Joint Ventures [Line Items]
Aggregate investment	$ 23,600	$ 26,700