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Real Estate - Additional Information (Detail)
$ in Thousands
6 Months Ended
Jun. 30, 2015
USD ($)
Property
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Real Estate Properties [Line Items]      
Reimbursements from utility and improvement districts $ (7,154) $ (6,618)  
Utility and Improvement District [Member]      
Real Estate Properties [Line Items]      
Cost of asset in developed and under development projects 87,516   $ 65,212
Cibolo Canyons Project [Member]      
Real Estate Properties [Line Items]      
Return of reimbursements received in relation to direct costs and expenses previously paid or incurred for development of real estate projects 33,552    
San Antonio Texas [Member] | Cibolo Canyons Project [Member]      
Real Estate Properties [Line Items]      
Cost of asset in developed and under development projects 44,063   $ 31,913
Cumulative Reimbursable Cost Associated with Real Estate Projects in Development $ 65,438    
Austin, Texas [Member] | Multi Family Property [Member]      
Real Estate Properties [Line Items]      
Number Of Units Of Multifamily Project | Property 257    
Dallas, Texas [Member] | Multi Family Property [Member]      
Real Estate Properties [Line Items]      
Number Of Units Of Multifamily Project | Property 354