Quarterly report pursuant to Section 13 or 15(d)

Mortgage Notes Payable and Line of Credit - Company's Mortgage Notes Payable and Line of Credit (Detail)

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Mortgage Notes Payable and Line of Credit - Company's Mortgage Notes Payable and Line of Credit (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Proforma Debt Instrument [Line Items]    
Premiums and (Discounts), net: $ 767 $ 895
Total Fixed-Rate Mortgage Notes Payable: 409,762 359,185
Variable-Rate Line of Credit: 28,900 25,000
Total Mortgage Notes Payable and Line of Credit 438,662 384,185
Mortgage Notes Payable [Member]
   
Proforma Debt Instrument [Line Items]    
Principal Balance Outstanding 408,995 358,290
Variable-Rate Line of Credit [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Aug. 07, 2013  
Principal Maturity Date Aug. 07, 2016  
Variable-Rate Line of Credit, Stated Interest Rate LIBOR +3.00 %  
Variable-Rate Line of Credit: 28,900 25,000
Mortgage Notes Payable One [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Feb. 21, 2006  
Principal Maturity Date Dec. 01, 2013  
Stated Interest Rate on Note 5.91%  
Principal Balance Outstanding 8,511 8,658
Mortgage Notes Payable Two [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Feb. 21, 2006  
Principal Maturity Date Jun. 30, 2014  
Stated Interest Rate on Note 5.20%  
Principal Balance Outstanding 17,603 17,930
Mortgage Notes Payable Three [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Aug. 25, 2005  
Principal Maturity Date Sep. 01, 2015  
Stated Interest Rate on Note 5.33%  
Principal Balance Outstanding 19,793 20,074
Mortgage Notes Payable Four [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Sep. 12, 2005  
Principal Maturity Date Sep. 01, 2015  
Stated Interest Rate on Note 5.21%  
Principal Balance Outstanding 11,664 11,821
Mortgage Notes Payable Five [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Sep. 06, 2007  
Principal Maturity Date Dec. 11, 2015  
Stated Interest Rate on Note 5.81%  
Principal Balance Outstanding 4,080 4,141
Mortgage Notes Payable Six [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Dec. 21, 2005  
Principal Maturity Date Jan. 08, 2016  
Stated Interest Rate on Note 5.71%  
Principal Balance Outstanding 17,922 18,155
Mortgage Notes Payable Seven [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Mar. 29, 2006  
Principal Maturity Date Apr. 01, 2016  
Stated Interest Rate on Note 5.92%  
Principal Balance Outstanding 16,507 16,669
Mortgage Notes Payable Eight [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Apr. 27, 2006  
Principal Maturity Date May 05, 2016  
Stated Interest Rate on Note 6.58%  
Principal Balance Outstanding 12,817 13,080
Mortgage Notes Payable Nine [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Aug. 29, 2008  
Principal Maturity Date Jun. 01, 2016  
Stated Interest Rate on Note 6.80%  
Principal Balance Outstanding 5,744 5,866
Mortgage Notes Payable Ten [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Jun. 20, 2011  
Principal Maturity Date Jun. 30, 2016  
Stated Interest Rate on Note 6.08%  
Principal Balance Outstanding 11,210 11,341
Mortgage Notes Payable Eleven [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Nov. 22, 2006  
Principal Maturity Date Dec. 01, 2016  
Stated Interest Rate on Note 5.76%  
Principal Balance Outstanding 13,397 13,558
Mortgage Notes Payable Twelve [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Dec. 22, 2006  
Principal Maturity Date Jan. 01, 2017  
Stated Interest Rate on Note 5.79%  
Principal Balance Outstanding 20,487 20,731
Mortgage Notes Payable Thirteen [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Feb. 08, 2007  
Principal Maturity Date Mar. 01, 2017  
Stated Interest Rate on Note 6.00%  
Principal Balance Outstanding 13,775 13,775
Mortgage Notes Payable Fourteen [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Jun. 05, 2007  
Principal Maturity Date Jun. 08, 2017  
Stated Interest Rate on Note 6.11%  
Principal Balance Outstanding 14,042 14,163
Mortgage Notes Payable Fifteen [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Oct. 15, 2007  
Principal Maturity Date Nov. 08, 2017  
Stated Interest Rate on Note 6.63%  
Principal Balance Outstanding 14,906 15,072
Mortgage Notes Payable Sixteen [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Sep. 26, 2012  
Principal Maturity Date Jul. 01, 2018  
Stated Interest Rate on Note 5.75%  
Principal Balance Outstanding 10,550 10,707
Mortgage Notes Payable Seventeen [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Nov. 18, 2011  
Principal Maturity Date Nov. 01, 2018  
Stated Interest Rate on Note 4.50%  
Principal Balance Outstanding 4,180 4,256
Mortgage Notes Payable Eighteen [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Dec. 06, 2011  
Principal Maturity Date Dec. 06, 2019  
Stated Interest Rate on Note 6.00%  
Principal Balance Outstanding 8,099 8,272
Mortgage Notes Payable Nineteen [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Oct. 28, 2011  
Principal Maturity Date Nov. 01, 2021  
Stated Interest Rate on Note 6.00%  
Principal Balance Outstanding 6,971 7,068
Mortgage Notes Payable Twenty [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Apr. 05, 2012  
Principal Maturity Date May 01, 2022  
Stated Interest Rate on Note 6.10%  
Principal Balance Outstanding 18,578 18,821
Mortgage Notes Payable Twenty One [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Jun. 21, 2012  
Principal Maturity Date Jul. 06, 2022  
Stated Interest Rate on Note 5.05%  
Principal Balance Outstanding 4,641 4,712
Mortgage Notes Payable Twenty Two [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Aug. 03, 2012  
Principal Maturity Date Jul. 31, 2022  
Stated Interest Rate on Note 5.00%  
Principal Balance Outstanding 2,932 2,979
Mortgage Notes Payable Twenty Three [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Jul. 24, 2012  
Principal Maturity Date Aug. 01, 2022  
Stated Interest Rate on Note 5.60%  
Principal Balance Outstanding 9,455 9,661
Mortgage Notes Payable Twenty Four [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Oct. 01, 2012  
Principal Maturity Date Oct. 01, 2022  
Stated Interest Rate on Note 4.86%  
Principal Balance Outstanding 33,369 33,888
Mortgage Notes Payable Twenty Five [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Nov. 21, 2012  
Principal Maturity Date Dec. 06, 2022  
Stated Interest Rate on Note 4.04%  
Principal Balance Outstanding 18,673 19,000
Mortgage Notes Payable Twenty Six [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Mar. 28, 2013  
Principal Maturity Date Apr. 06, 2023  
Stated Interest Rate on Note 4.16%  
Principal Balance Outstanding 3,666  
Mortgage Notes Payable Twenty Seven [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Jul. 03, 2013  
Principal Maturity Date Aug. 01, 2023  
Stated Interest Rate on Note 5.00%  
Principal Balance Outstanding 8,191  
Mortgage Notes Payable Twenty Eight [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Jul. 10, 2013  
Principal Maturity Date Aug. 01, 2023  
Stated Interest Rate on Note 4.20%  
Principal Balance Outstanding 8,889  
Mortgage Notes Payable Twenty Nine [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Jul. 09, 2013  
Principal Maturity Date Aug. 06, 2023  
Stated Interest Rate on Note 4.81%  
Principal Balance Outstanding 35,261  
Mortgage Notes Payable Thirty [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Dec. 15, 2010  
Principal Maturity Date Dec. 10, 2026  
Stated Interest Rate on Note 6.63%  
Principal Balance Outstanding 9,650 9,983
Mortgage Notes Payable Thirty One [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption May 16, 2012  
Principal Maturity Date Dec. 31, 2026  
Stated Interest Rate on Note 4.30%  
Principal Balance Outstanding 2,846 2,897
Mortgage Notes Payable Thirty Two [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Nov. 08, 2012  
Principal Maturity Date Feb. 01, 2027  
Stated Interest Rate on Note 5.69%  
Principal Balance Outstanding 13,936 14,145
Mortgage Notes Payable Thirty Three [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption May 30, 2012  
Principal Maturity Date May 10, 2027  
Stated Interest Rate on Note 6.50%  
Principal Balance Outstanding 4,725 4,883
Mortgage Notes Payable Thirty Four [Member]
   
Proforma Debt Instrument [Line Items]    
Date of Issuance/ Assumption Jun. 27, 2012  
Principal Maturity Date Jul. 01, 2029  
Stated Interest Rate on Note 5.10%  
Principal Balance Outstanding $ 1,925 $ 1,984