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Notes Payable - Components of Notes Payable (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Notes payable $ 62,557 $ 57,368
Acquisition and development loans [Member]
   
Debt Instrument [Line Items]    
Notes payable 37,181 37,996
Construction loans [Member]
   
Debt Instrument [Line Items]    
Notes payable 25,376 12,517
Revolving credit facility [Member]
   
Debt Instrument [Line Items]    
Notes payable   $ 6,855