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Indebtedness - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
May 31, 2013
Jun. 30, 2013
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Operating Partnership
May 13, 2013
Operating Partnership
May 13, 2013
Operating Partnership
Minimum
May 13, 2013
Operating Partnership
Maximum
Jul. 16, 2013
Subsequent Event
Operating Partnership
Jul. 16, 2013
Subsequent Event
Operating Partnership
Jul. 17, 2013
Subsequent Event
Two Columbus
Jul. 30, 2013
Construction Loans
Subsequent Event
Jul. 29, 2013
Construction Loans
Subsequent Event
Mar. 25, 2013
Main Street Land
Jan. 02, 2013
Main Street Land
Jan. 03, 2013
Main Street Land
May 31, 2013
Virginia Natural Gas
Jan. 16, 2013
Virginia Natural Gas
Jan. 15, 2013
Virginia Natural Gas
May 31, 2013
Gainsborough Square
Feb. 18, 2013
Gainsborough Square
Feb. 19, 2013
Gainsborough Square
May 31, 2013
Broad Creek Shopping Center
Notes 2
Apr. 15, 2013
Broad Creek Shopping Center
Notes 2
Debt Instrument [Line Items]                                                
Debt instrument maturity date                       Jan. 30, 2017   Jul. 03, 2013 Jan. 05, 2013 Apr. 03, 2013         Dec. 28, 2013 Jan. 28, 2014    
Stated interest rate, prime rate basis spread on variable rate                                   3.00% 4.00%          
Debt instrument, additional borrowed amount     $ 42,700,000 $ 12,977,000                                       $ 2,700,000
Defeased loan amount 147,264,000                   14,900,000           5,457,000     9,732,000     2,700,000  
Loss on extinguishment of debt   (1,125,000) (1,125,000)                                          
Loss on extinguishment of debt, fees     (600,000)                                          
Loss on extinguishment of debt, unamortized debt issuance costs     508,000                                          
Revolving credit facility, borrowed amount           40,000,000     15,000,000 15,000,000                            
Debt issuance costs           1,800,000                                    
Revolving credit facility, repayment of debt         15,000,000                                      
Revolving credit facility, interest rate description             LIBOR plus 1.60% LIBOR plus 2.20%       LIBOR plus 1.95%                        
Construction loan, percentage added to LIBOR             1.60% 2.20%       1.95%                        
Revolving credit facility, interest rate         2.39%                                      
Construction loan                       63,000,000 63,000,000                      
Defeased loan, costs                     $ 1,000,000