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Indebtedness - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 27, 2013
Berkshire Square Apartments
Dec. 31, 2013
Berkshire Square Apartments
Dec. 31, 2013
Mortgages Debt
Dec. 31, 2012
Mortgages Debt
Dec. 31, 2013
Fixed Rate Mortgage Debt
Dec. 31, 2013
Sponsor
Dec. 31, 2012
Sponsor
Dec. 31, 2013
Third Parties
Dec. 31, 2012
Third Parties
Oct. 25, 2013
Secured revolving credit facility
Dec. 31, 2013
Secured revolving credit facility
Oct. 25, 2013
Secured revolving credit facility
LIBOR
Mortgage Loans on Real Estate [Line Items]                              
Weighted average interest rate on mortgage indebtedness         4.40% [1] 3.80%                  
Debt $ 103,303,000               $ 38,100,000 $ 38,200,000 $ 65,200,000 $ 54,300,000      
Interest paid 3,545,000 3,219,000 1,712,000           722,000 724,000          
Revolving credit facility borrowing capacity                         20,000,000    
Debt instrument basis spread on LIBOR                             2.75%
Debt instrument, term                         3 years    
Debt outstanding                           2,500,000  
Loan agreement amount       8,600,000                      
Repayments of secured credit facility       8,000,000                      
Loan fixed interest rate       4.42%                      
Loan maturity date       Jan. 01, 2021                      
Loan amount due upon maturity       7,500,000                      
Federal Home Loan Mortgage Corporation's defined yield maintenance prepayment premium minimum percentage       1.00%                      
Loan non prepaid or defeased period       2 years                      
Fair value of indebtedness           $ 101,272,000 $ 95,827,000 $ 63,324,000              
[1] Fixed Rate. Interest only payments are due monthly. Beginning February 1, 2016, principal and interest payments are required based on a 30-year amortization schedule.