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Indebtedness - Additional Information (Detail)
3 Months Ended 9 Months Ended
Oct. 30, 2015
USD ($)
Oct. 15, 2015
Oct. 06, 2015
USD ($)
Sep. 01, 2015
USD ($)
Jul. 30, 2015
USD ($)
Jul. 10, 2015
USD ($)
Loans
May. 27, 2015
USD ($)
May. 20, 2015
USD ($)
Feb. 20, 2015
USD ($)
Jan. 23, 2015
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jul. 01, 2015
USD ($)
Feb. 19, 2015
USD ($)
Debt Instrument [Line Items]                            
Senior unsecured term loan facility                 $ 50,000,000          
Loss on extinguishment of debt                     $ 3,000 $ 410,000    
Socastee Commons Myrtle Beach [Member]                            
Debt Instrument [Line Items]                            
Debt instrument maturity date                       Jan. 06, 2023    
Debt assumed, interest rate                         4.57%  
Outstanding principal amount of debt                         $ 5,000,000  
Columbus Village in Virginia Beach [Member]                            
Debt Instrument [Line Items]                            
Debt instrument maturity date                       Apr. 05, 2018    
Outstanding principal amount of debt           $ 8,800,000                
Number of loans | Loans           2                
Columbus Village in Virginia Beach [Member] | LIBOR [Member]                            
Debt Instrument [Line Items]                            
Stated interest rate, basis spread on variable rate           2.00%                
Oyster Point [Member]                            
Debt Instrument [Line Items]                            
Repayment of secured debt       $ 6,100,000                    
Whetstone Apartments [Member]                            
Debt Instrument [Line Items]                            
Repayment of term loan facility               $ 17,800,000            
Loss on extinguishment of debt               $ 100,000            
Smith's Landing [Member]                            
Debt Instrument [Line Items]                            
Amount borrowed under credit facility             $ 21,600,000              
Debt instrument maturity date                       Jun. 01, 2035    
Repayment of term loan facility             24,400,000              
Loss on extinguishment of debt             $ 100,000              
Smith's Landing [Member] | Collateralized Mortgage Obligations [Member]                            
Debt Instrument [Line Items]                            
Debt assumed, interest rate             4.05%              
Johns Hopkins Village [Member]                            
Debt Instrument [Line Items]                            
Debt instrument maturity date                       Jul. 30, 2018    
Johns Hopkins Village [Member] | Construction Loans [Member]                            
Debt Instrument [Line Items]                            
Aggregate amount available under the construction loan         $ 50,000,000                  
Johns Hopkins Village [Member] | LIBOR [Member]                            
Debt Instrument [Line Items]                            
Stated interest rate, basis spread on variable rate         1.90%                  
Subsequent Event [Member]                            
Debt Instrument [Line Items]                            
Stated interest rate, basis spread on variable rate   2.00%                        
Revolving Credit Facility [Member] | New Credit Facility [Member]                            
Debt Instrument [Line Items]                            
Debt instrument maturity date                       Feb. 20, 2019    
Revolving credit facility, extension option                       1 year    
Revolving Credit Facility [Member] | Minimum [Member] | New Credit Facility [Member] | LIBOR [Member]                            
Debt Instrument [Line Items]                            
Stated interest rate, basis spread on variable rate                       1.40%    
Revolving Credit Facility [Member] | Maximum [Member] | New Credit Facility [Member] | LIBOR [Member]                            
Debt Instrument [Line Items]                            
Stated interest rate, basis spread on variable rate                       2.00%    
Senior Unsecured Term Loan Facility [Member] | Minimum [Member] | LIBOR [Member]                            
Debt Instrument [Line Items]                            
Stated interest rate, basis spread on variable rate                 1.35%          
Senior Unsecured Term Loan Facility [Member] | Maximum [Member] | LIBOR [Member]                            
Debt Instrument [Line Items]                            
Stated interest rate, basis spread on variable rate                 1.95%          
Term Loan Facility [Member] | New Credit Facility [Member]                            
Debt Instrument [Line Items]                            
Debt instrument maturity date                       Feb. 20, 2020    
Term Loan Facility [Member] | Minimum [Member] | New Credit Facility [Member] | LIBOR [Member]                            
Debt Instrument [Line Items]                            
Stated interest rate, basis spread on variable rate                       1.35%    
Term Loan Facility [Member] | Maximum [Member] | New Credit Facility [Member] | LIBOR [Member]                            
Debt Instrument [Line Items]                            
Stated interest rate, basis spread on variable rate                       1.95%    
Operating Partnership [Member]                            
Debt Instrument [Line Items]                            
Amount borrowed under loan agreements for construction                       $ 17,700,000    
Operating Partnership [Member] | New Credit Facility [Member]                            
Debt Instrument [Line Items]                            
Amount borrowed under credit facility                 $ 54,000,000          
Repayment of term loan facility                 50,000,000          
Repayment of other indebtedness                 39,000,000          
Loss on extinguishment of debt                 200,000          
Credit facility, amount outstanding                     $ 106,000,000 $ 106,000,000    
Operating Partnership [Member] | Prior Credit Facility [Member]                            
Debt Instrument [Line Items]                            
Amount borrowed under credit facility                   $ 5,000,000        
Debt instrument maturity date                       May 13, 2016    
Credit facility termination date                       Feb. 20, 2015    
Operating Partnership [Member] | Subsequent Event [Member] | Oyster Point [Member]                            
Debt Instrument [Line Items]                            
Debt instrument maturity date     Feb. 28, 2017                      
Secured debt     $ 6,400,000                      
Operating Partnership [Member] | Subsequent Event [Member] | Oyster Point [Member] | Minimum [Member] | LIBOR [Member]                            
Debt Instrument [Line Items]                            
Stated interest rate, basis spread on variable rate     1.40%                      
Operating Partnership [Member] | Subsequent Event [Member] | Oyster Point [Member] | Maximum [Member] | LIBOR [Member]                            
Debt Instrument [Line Items]                            
Stated interest rate, basis spread on variable rate     2.00%                      
Operating Partnership [Member] | Revolving Credit Facility [Member]                            
Debt Instrument [Line Items]                            
Debt instrument maturity date                       May 13, 2016    
Senior revolving credit facility, maximum borrowing capacity                           $ 155,000,000
Operating Partnership [Member] | Revolving Credit Facility [Member] | New Credit Facility [Member]                            
Debt Instrument [Line Items]                            
Interest rate                     1.75% 1.75%    
Operating Partnership [Member] | Senior Unsecured Credit Facility [Member] | New Credit Facility [Member]                            
Debt Instrument [Line Items]                            
Senior revolving credit facility, maximum borrowing capacity                 200,000,000          
Operating Partnership [Member] | Senior Unsecured Revolving Credit Facility [Member] | New Credit Facility [Member]                            
Debt Instrument [Line Items]                            
Senior revolving credit facility, maximum borrowing capacity                 150,000,000          
Operating Partnership [Member] | Senior Unsecured Term Loan Facility [Member] | New Credit Facility [Member]                            
Debt Instrument [Line Items]                            
Senior unsecured term loan facility                 $ 50,000,000          
Operating Partnership [Member] | Term Loan Facility [Member]                            
Debt Instrument [Line Items]                            
Credit facility, amount outstanding                     $ 50,000,000 $ 50,000,000    
Operating Partnership [Member] | Term Loan Facility [Member] | New Credit Facility [Member]                            
Debt Instrument [Line Items]                            
Interest rate                     1.70% 1.70%    
Oceaneering International Facility [Member] | Subsequent Event [Member]                            
Debt Instrument [Line Items]                            
Repayment of secured debt $ 18,700,000