Annual report pursuant to Section 13 and 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 $)
 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Mortgages
Property
Dec. 31, 2012
Aug. 31, 2013
Senior Unsecured Revolving Credit Facility [Member]
Dec. 31, 2013
Senior Unsecured Revolving Credit Facility [Member]
Aug. 31, 2013
Senior Secured Revolving Credit Facility [Member]
Aug. 31, 2013
Senior Secured Revolving Credit Facility [Member]
Prior Line of Credit Facility [Member]
Dec. 31, 2013
Letter of Credit [Member]
Dec. 31, 2013
Mortgage Notes Payable [Member]
Mortgages
Proforma Debt Instrument [Line Items]                
Number of mortgage notes payable               36
Weighted average interest rate on all debt outstanding 5.31%             5.40%
Number of properties collateralized in mortgage notes payable 70              
Net book value of collaterized mortgage properties $ 561,500,000              
Number of long-term mortgages issued 7              
Debt instrument maturity date               Dec. 01, 2013
Long-term notes payable               8,200,000
Stated interest rate 0.17%             2.15%
LIBOR floor rate on notes payable               0.50%
Minimum interest rate on notes payable               2.65%
Debt instrument maturity date description               maturity date of December 1, 2016, with four, one-year extension options
Debt instrument maturity date               Dec. 01, 2016
Interest rate cap               30,000
Stated interest rate               3.00%
Excess of LIBOR rate               3.00%
Fair value of mortgage notes payable outstanding 421,800,000              
Carrying value of mortgage notes payable outstanding 422,602,000 359,185,000            
Line of credit, outstanding     60,000,000 24,400,000 75,000,000      
Line of credit, maturity date     2016-08          
Extension period subject to payment of fee     1 year          
Extension fee on the initial maturity date     0.25%          
Line of credit, maturity date           Dec. 28, 2013    
Standby letters of credit sublimit     20,000,000          
Line of credit facility, maximum additional amount drawn 17,100,000   75,000,000          
Line of credit, variable spread on interest rate     3.25%          
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 at an interest rate 3.40%     3.40%        
Letters of credit, outstanding             $ 10,300,000