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Summary of Each Mortgage (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]    
Outstanding Principal $ 92,413 $ 92,413
Current Interest Rate 3.80% 3.80%
Crestmont Apartments
    
Mortgage Loans on Real Estate [Line Items]    
Outstanding Principal 6,750 6,750
Current Interest Rate 5.70% [1] 5.70%
Maturity Date May 01, 2021 May 01, 2021
Interest Terms   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
Interest payment period Monthly Monthly
Principal date May 01, 2013 May 01, 2013
Amortization schedule 30-year amortization schedule 30-year amortization schedule
Cumberland Glen Apartments
    
Mortgage Loans on Real Estate [Line Items]    
Outstanding Principal 6,900 6,900
Current Interest Rate 5.70% [1] 5.70%
Maturity Date May 01, 2021 May 01, 2021
Interest Terms   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
Interest payment period Monthly Monthly
Principal date May 01, 2013 May 01, 2013
Amortization schedule 30-year amortization schedule 30-year amortization schedule
Copper Mill Apartments
    
Mortgage Loans on Real Estate [Line Items]    
Outstanding Principal 7,350 7,350
Current Interest Rate 5.70% [1] 5.70%
Maturity Date May 01, 2021 May 01, 2021
Interest Terms   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
Interest payment period Monthly Monthly
Principal date May 01, 2013 May 01, 2013
Amortization schedule 30-year amortization schedule 30-year amortization schedule
Heritage Trace Apartments
    
Mortgage Loans on Real Estate [Line Items]    
Outstanding Principal 5,500 5,500
Current Interest Rate 5.70% [1] 5.70%
Maturity Date May 01, 2021 May 01, 2021
Interest Terms   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
Interest payment period Monthly Monthly
Principal date May 01, 2013 May 01, 2013
Amortization schedule 30-year amortization schedule 30-year amortization schedule
Belle Creek Apartments
    
Mortgage Loans on Real Estate [Line Items]    
Outstanding Principal 10,575 10,575
Current Interest Rate 2.50% [2] 2.50%
Maturity Date Apr. 28, 2021 Apr. 28, 2021
Interest Terms   Fixed rate of interest at 2.5% for the first two years with a floating rate thereafter at 225 basis points over 30-day LIBOR. Interest only
Fixed rate of interest 2.50% 2.50%
Debt Instrument Basis Spread On Variable Rate 2.25% 2.25%
Debt number of days of LIBOR against interest rate basis 30-day LIBOR 30-day LIBOR
Tresa At Arrowhead
    
Mortgage Loans on Real Estate [Line Items]    
Outstanding Principal 27,500 27,500
Current Interest Rate 2.50% [2] 2.50%
Maturity Date Apr. 28, 2021 Apr. 28, 2021
Interest Terms   Fixed rate of interest at 2.5% for the first two years with a floating rate thereafter at 225 basis points over 30-day LIBOR. Interest only
Fixed rate of interest 2.50% 2.50%
Debt Instrument Basis Spread On Variable Rate 2.25% 2.25%
Debt number of days of LIBOR against interest rate basis 30-day LIBOR 30-day LIBOR
Runaway Bay Apartments
    
Mortgage Loans on Real Estate [Line Items]    
Outstanding Principal 10,238 10,238
Current Interest Rate 3.60% [3] 3.60%
Maturity Date Nov. 01, 2022 Nov. 01, 2022
Interest Terms   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
Interest payment period Monthly Monthly
Principal date Dec. 01, 2013 Dec. 01, 2013
Amortization schedule 30-year amortization schedule 30-year amortization schdule
Centrepoint Apartments
    
Mortgage Loans on Real Estate [Line Items]    
Outstanding Principal $ 17,600 $ 17,600
Current Interest Rate 3.70% [4] 3.70%
Maturity Date Jan. 01, 2019 Jan. 01, 2019
Interest Terms   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
Interest payment period Monthly Monthly
Principal date Feb. 01, 2015 Feb. 01, 2015
Amortization schedule 30-year amortization schedule 30-year amortization schedule
[1] 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
[2] Fixed rate of interest at 2.5% for the first two years with a floating rate thereafter at 225 basis points over 30-day LIBOR. Interest only
[3] 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
[4] 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