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 $)
 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Mar. 28, 2014
Mar. 31, 2014
Property
Mortgages
Dec. 31, 2013
Aug. 31, 2013
Senior Unsecured Revolving Credit Facility [Member]
Mar. 31, 2014
Senior Unsecured Revolving Credit Facility [Member]
Mar. 31, 2014
Letter of Credit [Member]
Aug. 31, 2013
Senior Secured Revolving Credit Facility [Member]
Mar. 31, 2014
Mortgage Notes Payable [Member]
Mortgages
Debt Instrument [Line Items]                
Number of mortgage notes payable               37
Weighted average interest rate on all debt outstanding   5.30%           5.40%
Number of properties collateralized in mortgage notes payable   72            
Net book value of collateralized mortgage properties   $ 553,400,000            
Number of long-term mortgages issued   1            
Number of properties to collateralized mortgage notes payable   2            
Excess of LIBOR rate               3.00%
Fair value of mortgage notes payable outstanding   429,600,000            
Carrying value of mortgage notes payable outstanding   426,847,000 422,602,000          
Line of credit, outstanding       60,000,000 24,100,000   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   18,900,000   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   3.00%     3.20%      
Letters of credit, outstanding           $ 10,300,000