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Subsequent Events - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Mar. 31, 2013
Property
Mar. 31, 2012
Dec. 31, 2012
Property
Dec. 31, 2011
Dec. 31, 2010
May 07, 2013
Subsequent Event
Property
Jul. 25, 2013
Subsequent Event
Jul. 25, 2013
Subsequent Event
Base Management Fees [Member]
May 07, 2013
Subsequent Event
if pre-incentive fee Core FFO does not exceed hurdle rate
May 07, 2013
Subsequent Event
if pre-incentive fee Core FFO does not exceed hurdle rate
Maximum
May 07, 2013
Subsequent Event
if pre-incentive fee Core FFO exceeds hurdle rate
May 07, 2013
Subsequent Event
if pre-incentive fee Core FFO exceeds hurdle rate
Minimum
May 07, 2013
Subsequent Event
Subsidiaries
Subsequent Event [Line Items]                          
Common stock issued in exchange for limited partnership interest                         5,274,900
Limited partnership interest received in exchange for issuance of common stock                         5,274,900
Annual Management fee as percentage of average real estate assets           0.75%              
Number of multifamily property owned 8   8     8              
Quarterly management fee payment rate as percentage of average real estate assets           0.1875%              
Cumulative gross amount of equity capital, hurdle rate                   1.75%   1.75%  
Cumulative gross amount of equity capital, annual hurdle rate                   7.00%   7.00%  
Advisor incentive fee                 0.00%   20.00%    
Asset management fees $ 82 $ 53 $ 240 $ 9 $ 0     $ 0          
Transfer agent costs to be reimbursed             $ 132