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Related Party Transactions - Additional Information (Detail) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2016 USD ($) lot | Aug. 31, 2016 USD ($) lot | May 31, 2016 USD ($) lot | Jan. 31, 2015 USD ($) lot | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transactions |  |  |  |  | $ 0 | $ 0
Azusa, California | Affiliate of Starwood Capital Group |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Percentage of common stock held (percent) |  |  | 5.00% |  |  |
Number of lots acquired | lot | 27 |  | 52 |  |  |
Related party transactions | $ 9,600,000 |  | $ 18,400,000 |  |  |
Castle Rock, Colorado | Affiliate of Starwood Capital Group |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Number of lots acquired | lot | 126 | 257 |  | 46 |  |
Related party transactions | $ 4,200,000 | $ 8,600,000 |  | $ 2,800,000 |  |

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