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Indebtedness - Additional Information (Detail) |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 09, 2020 USD ($) | May 09, 2019 USD ($) | Oct. 30, 2018 USD ($) | Nov. 20, 2017 USD ($) | Feb. 28, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) Property | Jun. 30, 2020 | Nov. 30, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  |  |  | $ 4,208,000 |  | $ 5,606,000 |  |  |
Weighted average interest rate |  |  |  |  |  | 2.70% |  | 3.50% |  |  |
Mortgages |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  |  |  | $ 1,275,000 |  | $ 1,688,000 |  |  |
Weighted average interest rate |  |  |  |  |  | 3.90% |  | 3.90% |  | 3.90% |
Mortgages-Fixed Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage loan related to property disposition |  |  |  |  |  |  |  | $ 76,512,000 |  |  |
Number Of Property Dispositions | Property |  |  |  |  |  |  |  | 3 |  |  |
Unsecured Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility, revolving line of credit |  | $ 350,000,000 |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  | $ 350,000,000 |  |  |  |  |
Maturity date |  | May 09, 2023 |  |  |  |  |  |  |  |  |
Unsecured revolving line of credit, option to extend additional period |  | 6 months |  |  |  |  |  |  |  |  |
Maturity term description |  | option to extend the revolving commitment for two additional 6-month periods under certain circumstances, including the payment of an extension fee |  |  |  |  |  |  |  |  |
Deferred financing costs |  | $ 1,129,000 |  |  |  | $ 1,692,000 | [1] | $ 2,336,000 | [2] |  |
Mortgage loan related to property disposition | $ 32,117,000 |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  | 1.60% | [1] | 3.20% | [2] | 1.60% |
Unsecured Credit Facility | Key Bank Senior Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pool of unencumbered properties occupancy level |  |  |  |  |  | $ 100,000,000 |  |  |  |  |
Unsecured Credit Facility | Minimum | 1-month LIBOR Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  | 1.25% |  |  |  |  |  |  |  |  |
Unsecured Credit Facility | Minimum | Base Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  | 2.50% |  |  |  |  |  |  |  |  |
Unsecured Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  | $ 600,000,000 |  |  |  |  |  |  |  |  |
Unsecured Credit Facility | Maximum | 1-month LIBOR Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  | 2.00% |  |  |  |  |  |  |  |  |
Unsecured Credit Facility | Maximum | Base Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  | 1.00% |  |  |  |  |  |  |  |  |
Unsecured Term Loan |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  | $ 100,000,000 |  |  |  |  |  |  |
Deferred financing costs |  |  |  | $ 917,000 |  |  |  |  |  |  | $ 257,000
Unsecured Term Loan | Minimum | LIBOR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  | 1.20% |  |  |  |  |  |  |
Unsecured Term Loan | Maximum | LIBOR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  | 1.90% |  |  |  |  |  |  |
Unsecured Term Loans |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  | $ 200,000,000 |  |  |  |  |  |  |  |
Maturity date |  |  | Jan. 17, 2024 |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  |  |  | $ 1,241,000 |  | $ 1,582,000 |  |  |
Deferred financing costs |  |  | $ 821,000 |  |  |  |  |  |  |  |
Proceeds from credit facility |  |  | $ 150,000,000 |  | $ 50,000,000 |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  | 1.50% |  | 3.10% |  |  |
Unsecured Term Loans | Minimum | LIBOR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  | 1.20% |  |  |  |  |  |  |  |
Unsecured Term Loans | Maximum | LIBOR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  | 1.90% |  |  |  |  |  |  |  |
[1] | The unsecured credit facility total capacity is $350,000, of which $184,802 was outstanding as of December 31, 2020.
[2] | The secured credit facility total capacity was $350,000, of which $186,302 was outstanding as of December 31, 2019.

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