Quarterly report pursuant to sections 13 or 15(d)

Mortgage Loans Payable - Summary of Mortgage Loans Payable (Parenthetical) (Detail)

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Mortgage Loans Payable - Summary of Mortgage Loans Payable (Parenthetical) (Detail) (USD $)
9 Months Ended
Sep. 30, 2012
Shoppes at Eagle Harbor [Member]
 
Participating Mortgage Loans [Line Items]  
Mortgage term loan monthly installments payable $ 30,863
Mortgage term loan interest rate 6.20%
Maturity period of debt instrument 2012-04
Extended Maturity Date Of Debt Instrument Dec. 30, 2012
Monarch Bank Building [Member]
 
Participating Mortgage Loans [Line Items]  
Mortgage term loan interest rate 7.00%
Maturity period of debt instrument 2012-12
Amscot Building [Member]
 
Participating Mortgage Loans [Line Items]  
Mortgage term loan monthly installments payable 4,634
Mortgage term loan interest rate 6.50%
Maturity period of debt instrument 2014-04
Riversedge North [Member]
 
Participating Mortgage Loans [Line Items]  
Mortgage term loan monthly installments payable 13,556
Mortgage term loan interest rate 6.00%
Maturity period of debt instrument 2013-04
Walnut Hill Plaza [Member]
 
Participating Mortgage Loans [Line Items]  
Mortgage term loan monthly installments payable 25,269
Mortgage term loan interest rate 6.75%
Maturity period of debt instrument 2014-04
Subsidiaries [Member] | Lumber River Plaza [Member]
 
Participating Mortgage Loans [Line Items]  
Mortgage term loan monthly installments payable 18,414
Mortgage term loan interest rate 5.65%
Maturity period of debt instrument 2015-05
Subsidiaries [Member] | Perimeter Square [Member]
 
Participating Mortgage Loans [Line Items]  
Mortgage term loan monthly installments payable 28,089
Mortgage term loan interest rate 6.38%
Maturity period of debt instrument 2016-06
Subsidiaries [Member] | Shoppes At Tj Maxx [Member]
 
Participating Mortgage Loans [Line Items]  
Mortgage term loan monthly installments payable $ 43,931
Mortgage term loan interest rate 6.57%
Maturity period of debt instrument 2012-09