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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.

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