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Joint Ventures - Additional Information (Detail) $ in Thousands | 12 Months Ended
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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 |

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