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Indebtedness - Summary Information Concerning Indebtedness (Detail) - USD ($)
$ in Thousands

9 Months Ended

12 Months Ended

Sep. 30, 2020

Dec. 31, 2019

Jun. 30, 2020

Debt Instrument [Line Items]

Outstanding Principal

$ 1,008,808

$ 991,178

Unamortized Debt Issuance Costs

(4,571)

(5,606)

Carrying Amount

$ 1,004,237

$ 985,572

Weighted Average Rate

2.60%

3.50%

Weighted Average

Debt Instrument [Line Items]

Weighted Average Maturity (in years)

3 years 3 months 18 days

4 years

Unsecured Credit Facility

Debt Instrument [Line Items]

Outstanding Principal

$ 241,803

^[1]

$ 186,302

^[2]

Unamortized Debt Issuance Costs

(1,865)

^[1]

(2,336)

^[2]

Carrying Amount

$ 239,938

^[1]

$ 183,966

^[2]

Type

Floating

^[1]

Floating

^[2]

Weighted Average Rate

1.60%

^[1]

3.20%

^[2]

1.60%

Unsecured Credit Facility | Weighted Average

Debt Instrument [Line Items]

Weighted Average Maturity (in years)

2 years 7 months 6 days

^[1]

3 years 4 months 24 days

^[2]

Unsecured Term Loans

Debt Instrument [Line Items]

Outstanding Principal

$ 300,000

$ 300,000

Unamortized Debt Issuance Costs

(1,327)

(1,582)

Carrying Amount

$ 298,673

$ 298,418

Type

Floating

Floating

Weighted Average Rate

1.50%

3.10%

Unsecured Term Loans | Weighted Average

Debt Instrument [Line Items]

Weighted Average Maturity (in years)

3 years 7 months 6 days

4 years 3 months 18 days

Mortgages

Debt Instrument [Line Items]

Outstanding Principal

$ 467,005

$ 504,876

Unamortized Debt Issuance Costs

(1,379)

(1,688)

Carrying Amount

$ 465,626

$ 503,188

Type

Fixed

Fixed

Weighted Average Rate

3.90%

3.90%

3.90%

Mortgages | Weighted Average

Debt Instrument [Line Items]

Weighted Average Maturity (in years)

3 years 4 months 24 days

4 years

[1]	The unsecured credit facility total capacity is $350,000, of which $241,803 was outstanding as of September 30, 2020.
[2]	The unsecured credit facility total capacity was $350,000, of which $186,302 was outstanding as of December 31, 2019.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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