Quarterly report pursuant to sections 13 or 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail) (USD $)
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Mid Atlantic [Member]
   
Commitments And Contingencies Disclosure [Line Items]    
Total annualized base rent 94.00%  
Mid Atlantic [Member] | Subsidiaries [Member]
   
Commitments And Contingencies Disclosure [Line Items]    
Total annualized base rent 68.00%  
Southeast [Member]
   
Commitments And Contingencies Disclosure [Line Items]    
Total annualized base rent 6.00%  
Southeast [Member] | Subsidiaries [Member]
   
Commitments And Contingencies Disclosure [Line Items]    
Total annualized base rent 32.00%  
Amscot Building [Member] | Tenant One [Member]
   
Commitments And Contingencies Disclosure [Line Items]    
Lease terminate 2045  
Lease expenses $ 5,900 $ 8,800