Investments in Unconsolidated Entities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019 investment
Minimum
Investment Holdings [Line Items]
Ownership interest (percent)	7.00%
Maximum
Investment Holdings [Line Items]
Ownership interest (percent)	65.00%
Homebuilding Partnerships or Limited Liability Companies
Investment Holdings [Line Items]
Number of equity investments	5
Financial Services Limited Liability Company
Investment Holdings [Line Items]
Number of equity investments	1