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Summary Information Concerning Indebtedness (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Outstanding Principal $ 784,640 $ 750,188
Unamortized Discount and Debt Issuance Costs (6,198) (6,371)
Carrying Amount $ 778,442 $ 743,817
Weighted Average Rate 3.60% 3.60%
Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 5 years 8 months 12 days 5 years 8 months 12 days
Mortgages-Fixed Rate    
Debt Instrument [Line Items]    
Outstanding Principal $ 580,635 $ 600,188
Unamortized Discount and Debt Issuance Costs (2,927) (3,651)
Carrying Amount $ 577,708 $ 596,537
Type Fixed Fixed
Weighted Average Rate 3.70% 3.80%
Mortgages-Fixed Rate | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 5 years 9 months 18 days 6 years 8 months 12 days
Unsecured Credit Facility    
Debt Instrument [Line Items]    
Outstanding Principal [1] $ 104,005  
Unamortized Discount and Debt Issuance Costs [1] (2,376)  
Carrying Amount $ 101,629 [1] $ 147,280
Type [1] Floating  
Weighted Average Rate [1] 3.00%  
Unsecured Credit Facility | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) [1] 3 years 9 months 18 days  
Term Loan    
Debt Instrument [Line Items]    
Outstanding Principal $ 100,000  
Unamortized Discount and Debt Issuance Costs (895)  
Carrying Amount $ 99,105  
Type Floating  
Weighted Average Rate 3.20%  
Term Loan | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 6 years 10 months 24 days  
Secured Credit Facility    
Debt Instrument [Line Items]    
Outstanding Principal [2]   150,000
Unamortized Discount and Debt Issuance Costs [2]   (2,720)
Carrying Amount [2]   $ 147,280
Type [2]   Floating
Weighted Average Rate [2]   3.00%
Secured Credit Facility | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) [2]   1 year 8 months 12 days
[1] The unsecured credit facility total capacity is $300,000, of which $104,005 was outstanding as of December 31, 2017.
[2] The secured credit facility total capacity was $312,500, of which $150,000 was outstanding as of December 31, 2016.