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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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