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 (Parenthetical) (Detail)

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Mortgage Notes Payable and Line of Credit - Company's Mortgage Notes Payable and Line of Credit (Parenthetical) (Detail) - Jun. 30, 2015 - Mortgages
Total
Debt Instrument [Line Items]  
Number of mortgage notes payable 44
Libor rate 0.19%
Libor rate description One month LIBOR was approximately 0.19%
Weighted average interest rate on debt outstanding 4.93%
Fixed Rate Mortgage Loans [Member]  
Debt Instrument [Line Items]  
Number of mortgage notes payable 44
Maturity date of mortgage notes payable, start date Sep. 01, 2015
Maturity date of mortgage notes payable, end date Jan. 06, 2039
Fixed Rate Mortgage Loans [Member] | Minimum [Member]  
Debt Instrument [Line Items]  
Stated Interest Rates 3.75%
Fixed Rate Mortgage Loans [Member] | Maximum [Member]  
Debt Instrument [Line Items]  
Stated Interest Rates 6.80%
Variable Rate Mortgage Loans [Member]  
Debt Instrument [Line Items]  
Libor rate description Variable rate mortgage notes payable vary from one month LIBOR + 2.15% to one month LIBOR + 2.25%
Variable Rate Mortgage Loans [Member] | Minimum [Member]  
Debt Instrument [Line Items]  
Libor rate 2.15%
Variable Rate Mortgage Loans [Member] | Maximum [Member]  
Debt Instrument [Line Items]  
Libor rate 2.25%