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Investments in Real Estate - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2012
Property
Apr. 29, 2011
Property
Dec. 16, 2011
Centrepoint Apartments
Property
Oct. 11, 2012
Runaway Bay Apartments
Property
Dec. 31, 2012
Real Estate Investment
Property
Real Estate Properties [Line Items]          
Number of multifamily property owned 8       8
Number of units located with multifamily properties 2,004 6 320 192 2,004
Contribution value of the initial portfolio   $ 103,790      
Limited partner interests issued for acquisition of the initial portfolio   39,215      
Limited partner units issued for acquisition of the initial portfolio   3,921,500      
Additional Limited partner interests Value   1,250      
Additional Limited partner units   125,000      
Mortgage indebtedness of operating partnership   64,575      
Purchased price of a property     29,500 15,750  
Mortgage amount obtained     17,600 10,238  
Limited partner interests issued     12,282    
Limited partner units issued     12,282,000    
Cash paid for purchase of property       $ 5,512