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Fair Value Disclosures - Net Book Values and Estimated Fair Values of Notes Payable (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Notes payable    
Notes payable, Cost $ 227,128 $ 138,112
Notes payable, Fair Value 227,128 138,112
Unsecured revolving credit facility [Member] | Level 2 [Member]
   
Notes payable    
Notes payable, Cost 210,000  
Notes payable, Fair Value 210,000  
Secured revolving credit facilities [Member] | Level 3 [Member]
   
Notes payable    
Notes payable, Cost   90,689
Notes payable, Fair Value   90,689
Seller financed loans [Member]
   
Notes payable    
Notes payable, Cost 17,128  
Seller financed loans [Member] | Level 3 [Member]
   
Notes payable    
Notes payable, Cost 17,128  
Notes payable, Fair Value 17,128  
Acquisition and development loans [Member]
   
Notes payable    
Notes payable, Cost   31,591
Acquisition and development loans [Member] | Level 3 [Member]
   
Notes payable    
Notes payable, Cost   31,591
Notes payable, Fair Value   31,591
Construction loans [Member]
   
Notes payable    
Notes payable, Cost   15,832
Construction loans [Member] | Level 3 [Member]
   
Notes payable    
Notes payable, Cost   15,832
Notes payable, Fair Value   $ 15,832