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Indebtedness - Summary Information Concerning Indebtedness (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Outstanding Principal $ 1,013,843 $ 991,178
Unamortized Debt Issuance Costs (4,932) (5,606)
Carrying Amount $ 1,008,911 $ 985,572
Weighted Average Rate 2.70% 3.50%
Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 3 years 6 months 4 years
Unsecured Credit Facility    
Debt Instrument [Line Items]    
Outstanding Principal $ 212,802 [1] $ 186,302 [2]
Unamortized Debt Issuance Costs (2,037) [1] (2,336) [2]
Carrying Amount $ 210,765 [1] $ 183,966 [2]
Type Floating [1] Floating [2]
Weighted Average Rate 1.60% [1] 3.20% [2]
Unsecured Credit Facility | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 2 years 10 months 24 days [1] 3 years 4 months 24 days [2]
Unsecured Term Loans    
Debt Instrument [Line Items]    
Outstanding Principal $ 300,000 $ 300,000
Unamortized Debt Issuance Costs (1,412) (1,582)
Carrying Amount $ 298,588 $ 298,418
Type Floating Floating
Weighted Average Rate 1.50% 3.10%
Unsecured Term Loans | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 3 years 9 months 18 days 4 years 3 months 18 days
Mortgages    
Debt Instrument [Line Items]    
Outstanding Principal $ 501,041 $ 504,876
Unamortized Debt Issuance Costs (1,483) (1,688)
Carrying Amount $ 499,558 $ 503,188
Type Fixed Fixed
Weighted Average Rate 3.90% 3.90%
Mortgages | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 3 years 6 months 4 years
[1] The unsecured credit facility total capacity is $350,000, of which $212,802 was outstanding as of June 30, 2020. 
[2] The unsecured credit facility total capacity was $350,000, of which $186,302 was outstanding as of December 31, 2019.