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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

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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Line of credit, option to extend additional period.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Gross amount of debt extinguished.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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