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Indebtedness - Additional Information (Detail) - USD ($) | Jul. 01, 2021 | May 18, 2021 | Apr. 05, 2021 | Mar. 01, 2021 | Jun. 30, 2021 | Dec. 31, 2020
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  | 2.40% |  | 2.70%
Upfront costs |  |  |  |  |  | $ 4,675,000 |  | $ 4,208,000
Mortgages |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  | 4.20% | 5.70% | 3.80% | [1] | 3.90%
Upfront costs |  |  |  |  |  | $ 1,074,000 | [1] | $ 1,275,000
Mortgages | Subsequent Event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Weighted average interest rate |  | 3.40% |  |  |  |  |  |
Unsecured Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Mortgage loan related to property disposition |  |  |  | $ 13,666,000 | $ 5,975,000 |  |  |
Weighted average interest rate | [2] |  |  |  |  | 1.40% |  | 1.60%
Credit facility, revolving line of credit |  |  | $ 550,000,000 |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  | $ 350,000,000 |  | $ 350,000,000
Upfront costs | [2] |  |  |  |  | $ 1,353,000 |  | $ 1,692,000
Unsecured Credit Facility | Subsequent Event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Mortgage loan related to property disposition |  | $ 18,650,000 |  |  |  |  |  |
Unsecured Credit Facility | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  | 600,000,000 |  |  |  |  |
Unsecured Revolving Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, revolving line of credit |  |  | $ 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 a payment of an extension fee. |  |  |  |  |
Upfront costs |  |  | $ 1,200,000 |  |  |  |  |
Unsecured Revolving Line of Credit | Minimum | 1-month LIBOR Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt interest rate |  |  | 1.25% |  |  |  |  |
Unsecured Revolving Line of Credit | Minimum | Base Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt interest rate |  |  | 2.50% |  |  |  |  |
Unsecured Revolving Line of Credit | Maximum | 1-month LIBOR Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt interest rate |  |  | 2.00% |  |  |  |  |
Unsecured Revolving Line of Credit | Maximum | Base Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt interest rate |  |  | 1.00% |  |  |  |  |
New Unsecured Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, revolving line of credit |  |  | $ 200,000,000 |  |  |  |  |
Maturity date |  |  | May 18, 2026 |  |  |  |  |
Upfront costs |  |  | $ 1,200,000 |  |  |  |  |
New Unsecured Term Loan | Minimum | Base Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt interest rate |  |  | 2.00% |  |  |  |  |
New Unsecured Term Loan | Minimum | LIBOR Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt interest rate |  |  | 1.20% |  |  |  |  |
New Unsecured Term Loan | Maximum | Base Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt interest rate |  |  | 9.00% |  |  |  |  |
New Unsecured Term Loan | Maximum | LIBOR Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt interest rate |  |  | 1.90% |  |  |  |  |
[1] | Includes indebtedness associated with real estate held for sale.
[2] | The unsecured credit facility total capacity was $350,000, of which $184,802 was outstanding as of December 31, 2020.

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