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Summary Information Concerning Indebtedness (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |
Outstanding Principal | $ 991,415 |  | $ 784,640 |
Unamortized Discount and Debt Issuance Costs | (5,927) |  | (6,198) |
Carrying Amount | $ 985,488 |  | $ 778,442 |
Weighted Average Rate | 3.90% |  | 3.60% |
Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted Average Maturity (in years) | 4 years 9 months 18 days |  | 5 years 8 months 12 days |
Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding Principal | $ 585,672 |  | $ 580,635 |
Unamortized Discount and Debt Issuance Costs | (2,547) |  | (2,927) |
Carrying Amount | $ 583,125 |  | $ 577,708 |
Type | Fixed |  | Fixed |
Weighted Average Rate | 3.80% |  | 3.70% |
Mortgages | Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted Average Maturity (in years) | 5 years 1 month 6 days |  | 5 years 9 months 18 days |
Unsecured Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding Principal | $ 155,743 | [1] | $ 104,005 | [2]
Unamortized Discount and Debt Issuance Costs | (1,760) | [1] | (2,376) | [2]
Carrying Amount | $ 153,983 | [1] | $ 101,629 | [2]
Type | Floating | [1] | Floating | [2]
Weighted Average Rate | 3.90% | [1] | 3.00% | [2]
Unsecured Credit Facility | Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted Average Maturity (in years) | 2 years 8 months 12 days | [1] | 3 years 9 months 18 days | [2]
Unsecured Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding Principal | $ 250,000 |  | $ 100,000 |
Unamortized Discount and Debt Issuance Costs | (1,620) |  | (895) |
Carrying Amount | $ 248,380 |  | $ 99,105 |
Type | Floating |  | Floating |
Weighted Average Rate | 4.00% |  | 3.20% |
Unsecured Term Loan | Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted Average Maturity (in years) | 5 years 4 months 24 days |  | 6 years 10 months 24 days |
[1] | The unsecured credit facility total capacity is $300,000, of which $155,743 was outstanding as of December 31, 2018.
[2] | The secured credit facility total capacity was $300,000, of which $104,005 was outstanding as of December 31, 2017.

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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=109500613&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=6879938&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=6877327&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=6876686&loc=d3e534808-122878 + Details
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