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Summary Information Concerning Indebtedness (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Outstanding Principal $ 991,415 $ 784,640
Unamortized Discount and Debt Issuance Costs (5,927) (6,198)
Carrying Amount $ 985,488 $ 778,442
Weighted Average Rate 3.90% 3.60%
Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 4 years 9 months 18 days 5 years 8 months 12 days
Mortgages    
Debt Instrument [Line Items]    
Outstanding Principal $ 585,672 $ 580,635
Unamortized Discount and Debt Issuance Costs (2,547) (2,927)
Carrying Amount $ 583,125 $ 577,708
Type Fixed Fixed
Weighted Average Rate 3.80% 3.70%
Mortgages | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 5 years 1 month 6 days 5 years 9 months 18 days
Unsecured Credit Facility    
Debt Instrument [Line Items]    
Outstanding Principal $ 155,743 [1] $ 104,005 [2]
Unamortized Discount and Debt Issuance Costs (1,760) [1] (2,376) [2]
Carrying Amount $ 153,983 [1] $ 101,629 [2]
Type Floating [1] Floating [2]
Weighted Average Rate 3.90% [1] 3.00% [2]
Unsecured Credit Facility | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 2 years 8 months 12 days [1] 3 years 9 months 18 days [2]
Unsecured Term Loan    
Debt Instrument [Line Items]    
Outstanding Principal $ 250,000 $ 100,000
Unamortized Discount and Debt Issuance Costs (1,620) (895)
Carrying Amount $ 248,380 $ 99,105
Type Floating Floating
Weighted Average Rate 4.00% 3.20%
Unsecured Term Loan | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 5 years 4 months 24 days 6 years 10 months 24 days
[1] The unsecured credit facility total capacity is $300,000, of which $155,743 was outstanding as of December 31, 2018.
[2] The secured credit facility total capacity was $300,000, of which $104,005 was outstanding as of December 31, 2017.