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Real Estate - Additional Information (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Utility and Improvement District    
Real Estate Properties [Line Items]    
Cost of asset in developed and under development projects $ 46,205 $ 45,157
Reimbursements from utility and improvement districts 4,671  
San Antonio, Texas | Cibolo Canyons Project    
Real Estate Properties [Line Items]    
Cost of asset in developed and under development projects 15,457 $ 14,749
Cumulative reimbursable cost associated with real estate projects in development 58,790  
Return of reimbursements received in relation to direct costs and expenses previously paid or incurred for development of real estate projects $ 45,132