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Real Estate - Additional Information (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
Property
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Real Estate Properties [Line Items]      
Reimbursements from utility and improvement districts $ (8,285) $ (8,554)  
Utility and Improvement District [Member]      
Real Estate Properties [Line Items]      
Cost of asset in developed and under development projects 67,925   $ 65,212
Reimbursements from utility and improvement districts 7,860    
San Antonio Texas [Member] | Cibolo Canyons Project [Member]      
Real Estate Properties [Line Items]      
Cost of asset in developed and under development projects 21,438   $ 31,913
Cumulative Reimbursable Cost Associated with Real Estate Projects in Development 54,376    
Return of reimbursements received in relation to direct costs and expenses previously paid or incurred for development of real estate projects $ 34,703    
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