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Indebtedness - Additional Information (Detail) (USD $)
9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Construction Loans [Member]
Sep. 30, 2014
Construction Loans [Member]
Oceaneering International Facility [Member]
Feb. 28, 2014
Construction Loans [Member]
Oceaneering International Facility [Member]
Feb. 28, 2014
Construction Loans [Member]
Oceaneering International Facility [Member]
LIBOR [Member]
Sep. 30, 2014
Construction Loans [Member]
Commonwealth Virginia [Member]
Aug. 28, 2014
Construction Loans [Member]
Commonwealth Virginia [Member]
Aug. 28, 2014
Construction Loans [Member]
Commonwealth Virginia [Member]
LIBOR [Member]
Nov. 03, 2014
Subsequent Event [Member]
Oct. 15, 2014
Subsequent Event [Member]
Sep. 15, 2014
Operating Partnership [Member]
Apr. 22, 2014
Operating Partnership [Member]
Sep. 30, 2014
Operating Partnership [Member]
Jan. 17, 2014
Liberty Apartments [Member]
Sep. 30, 2014
Liberty Apartments [Member]
Jun. 13, 2014
Liberty Apartments [Member]
Jan. 17, 2014
Liberty Apartments [Member]
Aug. 15, 2014
Dimmock Square [Member]
Debt Instrument [Line Items]                                      
Acquisition, assumption of debt                             $ 17,000,000        
Fair value adjustment of debt of liberty apartment                             1,500,000        
Outstanding principal amount of debt                               16,966,000   18,500,000  
Loans available under Liberty Apartments loan                                 2,400,000    
Debt assumed, interest rate                                   5.66%  
Stated maturity date       Feb. 28, 2018     Aug. 28, 2017                 Nov. 01, 2043      
Debt assumed, term                             30 years        
Debt, face value         19,500,000     5,400,000                      
Stated interest rate, basis spread on variable rate           1.75%     1.90%                    
Indebtedness 335,792,000 277,745,000   7,700,000     700,000                        
Effective interest rate percentage       1.91%     2.06%                        
Financial covenant, maximum leverage ratio as of the last day of each fiscal quarter                         65.00%            
Defeased loan                                     10,100,000
Revolving credit facility, borrowed amount     48,600,000               10,000,000     33,000,000          
Repayment of revolving credit facility                   1,000,000   49,000,000              
Revolving credit facility, outstanding amount                           $ 54,000,000