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Indebtedness - Summary Information Concerning Indebtedness (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Jul. 30, 2021
Jul. 01, 2021
Apr. 05, 2021
Mar. 01, 2021
Debt Instrument [Line Items]            
Outstanding Principal $ 1,023,011 $ 949,894        
Unamortized Debt Issuance Costs (4,282) (4,208)        
Carrying Amount $ 1,018,729 $ 945,686        
Weighted Average Rate 2.30% 2.70%        
Weighted Average            
Debt Instrument [Line Items]            
Weighted Average Maturity (in years) 2 years 10 months 24 days 3 years 1 month 6 days        
Unsecured Credit Facility            
Debt Instrument [Line Items]            
Outstanding Principal $ 137,503 [1] $ 184,802 [2]        
Unamortized Debt Issuance Costs (1,179) [1] (1,692) [2]        
Carrying Amount $ 136,324 [1] $ 183,110 [2]        
Type Floating [1] Floating [2]        
Weighted Average Rate 1.40% [1] 1.60% [2]        
Unsecured Credit Facility | Weighted Average            
Debt Instrument [Line Items]            
Weighted Average Maturity (in years) 1 year 7 months 6 days [1] 2 years 4 months 24 days [2]        
Unsecured Term Loans            
Debt Instrument [Line Items]            
Outstanding Principal $ 500,000 $ 300,000        
Unamortized Debt Issuance Costs (2,156) (1,241)        
Carrying Amount $ 497,844 $ 298,759        
Type Floating Floating        
Weighted Average Rate 1.30% 1.50%        
Unsecured Term Loans | Weighted Average            
Debt Instrument [Line Items]            
Weighted Average Maturity (in years) 3 years 4 months 24 days 3 years 3 months 18 days        
Mortgages            
Debt Instrument [Line Items]            
Outstanding Principal $ 385,508 [3] $ 465,092        
Unamortized Debt Issuance Costs (947) [3] (1,275)        
Carrying Amount [3] $ 384,561 $ 463,817        
Type Fixed [3] Fixed        
Weighted Average Rate 3.80% [3] 3.90% 3.70% 3.40% 4.20% 5.70%
Mortgages | Weighted Average            
Debt Instrument [Line Items]            
Weighted Average Maturity (in years) 2 years 9 months 18 days [3] 3 years 2 months 12 days        
[1] The unsecured credit facility total capacity is $350,000, of which $137,503 was outstanding as of September 30, 2021.
[2] The unsecured credit facility total capacity was $350,000, of which $184,802 was outstanding as of December 31, 2020.
[3] Includes indebtedness associated with real estate held for sale.