Quarterly report pursuant to sections 13 or 15(d)

Commitments and Contingencies - Components of Portfolio (Parenthetical) (Detail)

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Commitments and Contingencies - Components of Portfolio (Parenthetical) (Detail) (Tenant One [Member])
9 Months Ended
Sep. 30, 2012
Monarch Bank Building [Member]
 
Commitment And Contingencies [Line Items]  
Option exercised 5 years
Lease Extend Dec. 31, 2017
Subsidiaries [Member] | Shoppes At Tj Maxx [Member]
 
Commitment And Contingencies [Line Items]  
Option exercised 5 years
Lease Extend Apr. 30, 2019
Grant additional option 5 years
Subsidiaries [Member] | Lumber River Plaza [Member]
 
Commitment And Contingencies [Line Items]  
Option exercised 5 years
Lease Extend Jun. 30, 2018