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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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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