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Related-Party Transactions - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
May. 31, 2015
Affiliates [Member]          
Related Party Transaction [Line Items]          
Real estate inventory acquisitions from affiliates $ 16.8 $ 15.3 $ 16.8 $ 31.0  
Pacific Point Development Partners LLC [Member]          
Related Party Transaction [Line Items]          
Date of site acquisition     May 19, 2015    
Initial capital investment in joint venture         $ 16.8