Quarterly report pursuant to Section 13 or 15(d)

Mortgage Notes Payable and Line of Credit - Additional Information (Detail)

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Mortgage Notes Payable and Line of Credit - Additional Information (Detail) (USD $)
 0 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended
Mar. 28, 2014
Sep. 30, 2014
Mortgages
Property
Dec. 31, 2013
Aug. 31, 2013
Senior Unsecured Revolving Credit Facility [Member]
Sep. 30, 2014
Senior Unsecured Revolving Credit Facility [Member]
Aug. 31, 2013
Senior Secured Revolving Credit Facility [Member]
Sep. 30, 2014
Letter of Credit [Member]
Sep. 30, 2014
Mortgage Notes Payable [Member]
Debt Instrument [Line Items]                
Number of mortgage notes payable   41            
Weighted average interest on debt outstanding   5.13%         2.75% 5.35%
Number of properties collateralized in mortgage notes payable   76            
Net book value of collateralized mortgage properties   $ 614,500,000            
Number of long-term mortgages issued   2            
Number of properties to collateralized mortgage notes payable   3            
Number of long-term mortgages assumed   3            
Number of properties to issue collateralized mortgage notes payable   3            
Excess of LIBOR rate               3.00%
Fair value of mortgage notes payable outstanding   467,500,000            
Carrying value of mortgage notes payable outstanding   460,358,000 422,602,000          
Line of credit, outstanding   45,600,000 24,400,000 60,000,000 45,600,000 75,000,000    
Line of credit, maturity date 2017-08     2017-08        
Extension period subject to payment of fee 1 year     1 year        
Extension fee on the initial maturity date 0.25%     0.25%        
Standby letters of credit sublimit       20,000,000        
Line of credit facility, maximum additional amount drawn   5,300,000   75,000,000        
Line of credit, variable spread on interest rate       3.00%        
Annual maintenance fee       30,000        
Unused commitment fee       0.25%        
Line of credit covenant limit of distributions to shareholders percentage       100.00%        
Line of credit facility, maximum additional amount drawn       1,300,000        
Extension fee on the initial maturity date       0.0025        
Line of credit at an interest rate         2.90%      
Letters of credit, outstanding             $ 5,800,000