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Related Party Transactions - Additional Information (Detail)
$ in Millions
1 Months Ended
Jan. 31, 2015
USD ($)
Lot
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Weyerhaeuser [Member]      
Related Party Transaction [Line Items]      
Accrued liabilities   $ 15.9 $ 15.7
Starwood Capital Group [Member]      
Related Party Transaction [Line Items]      
Number of lots acquired | Lot 46    
Payment for acquiring lots $ 2.8