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Investments in Unconsolidated Entities - Additional Information (Detail)
3 Months Ended
Mar. 31, 2019
investment
Minimum  
Investment Holdings [Line Items]  
Ownership percentage (percent) 7.00%
Maximum  
Investment Holdings [Line Items]  
Ownership percentage (percent) 65.00%
Homebuilding Partnerships or Limited Liability Companies  
Investment Holdings [Line Items]  
Number of equity investments 4
Financial Services Limited Liability Company  
Investment Holdings [Line Items]  
Number of equity investments 1