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Summary Information Concerning Indebtedness (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Outstanding Principal $ 985,016 $ 991,415
Unamortized Debt Issuance Costs (5,686) (5,927)
Carrying Amount $ 979,330 $ 985,488
Weighted Average Rate 3.70% 3.90%
Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 4 years 3 months 18 days 4 years 9 months 18 days
Mortgages    
Debt Instrument [Line Items]    
Outstanding Principal $ 528,713 $ 585,672
Unamortized Debt Issuance Costs (1,892) (2,547)
Carrying Amount $ 526,821 $ 583,125
Type Fixed Fixed
Weighted Average Rate 3.80% 3.80%
Mortgages | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 4 years 3 months 18 days 5 years 1 month 6 days
Unsecured Credit Facility    
Debt Instrument [Line Items]    
Outstanding Principal $ 156,303 [1] $ 155,743 [2]
Unamortized Debt Issuance Costs (2,388) [1] (1,760) [2]
Carrying Amount $ 153,915 [1] $ 153,983 [2]
Type Floating [1] Floating [2]
Weighted Average Rate 3.50% [1] 3.90% [2]
Unsecured Credit Facility | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 3 years 7 months 6 days [1] 2 years 8 months 12 days [2]
Unsecured Term Loans    
Debt Instrument [Line Items]    
Outstanding Principal $ 300,000 $ 250,000
Unamortized Debt Issuance Costs (1,406) (1,620)
Carrying Amount $ 298,594 $ 248,380
Type Floating Floating
Weighted Average Rate 3.50% 4.00%
Unsecured Term Loans | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 4 years 7 months 6 days 5 years 4 months 24 days
[1] The total capacity under the unsecured credit facility is $350,000, of which $156,303 was outstanding as of September 30, 2019.
[2] The total capacity under the unsecured credit facility was $300,000, of which $155,743 was outstanding as of December 31, 2018.