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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 |  |

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