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Summary of Each Mortgage (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]    
Outstanding Principal $ 92,360 $ 92,413
Current Interest Rate 3.80%  
Belle Creek Apartments
    
Mortgage Loans on Real Estate [Line Items]    
Outstanding Principal 10,575 10,575
Current Interest Rate 2.50% [1]  
Maturity Date Apr. 28, 2021  
Centrepoint Apartments
    
Mortgage Loans on Real Estate [Line Items]    
Outstanding Principal 17,600 17,600
Current Interest Rate 3.70% [2]  
Maturity Date Jan. 01, 2019  
Copper Mill Apartments
    
Mortgage Loans on Real Estate [Line Items]    
Outstanding Principal 7,335 7,350
Current Interest Rate 5.70% [3]  
Maturity Date May 01, 2021  
Crestmont Apartments
    
Mortgage Loans on Real Estate [Line Items]    
Outstanding Principal 6,737 6,750
Current Interest Rate 5.70% [3]  
Maturity Date May 01, 2021  
Cumberland Glen Apartments
    
Mortgage Loans on Real Estate [Line Items]    
Outstanding Principal 6,886 6,900
Current Interest Rate 5.70% [3]  
Maturity Date May 01, 2021  
Heritage Trace Apartments
    
Mortgage Loans on Real Estate [Line Items]    
Outstanding Principal 5,489 5,500
Current Interest Rate 5.70% [3]  
Maturity Date May 01, 2021  
Runaway Bay Apartments
    
Mortgage Loans on Real Estate [Line Items]    
Outstanding Principal 10,238 10,238
Current Interest Rate 3.60% [4]  
Maturity Date Nov. 01, 2022  
Tresa At Arrowhead
    
Mortgage Loans on Real Estate [Line Items]    
Outstanding Principal $ 27,500 $ 27,500
Current Interest Rate 2.50% [1]  
Maturity Date Apr. 28, 2021  
[1] Floating rate at 225 basis points over 30-day LIBOR. As of June 30, 2013 30-day LIBOR was 0.19%. Interest only payments are due monthly.
[2] Fixed rate. Interest only payments are due monthly. Beginning February 1, 2015, principal and interest payments are required based on a 30-year amortization schedule.
[3] Fixed rate. Interest only payments are due monthly. Beginning May 1, 2013, principal and interest payments are required based on a 30-year amortization schedule.
[4] Fixed Rate. Interest only payments are due monthly. Beginning December 1, 2013, principal and interest payments are required based on a 30-year amortization schedule.