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Debt - Debt (Parenthetical) (Detail) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Unamortized debt issuance cost | $ 673,000 | $ 617,000
Unsecured private placement 3.95% note [Member] |  |
Debt Instrument [Line Items] |  |
Unamortized debt issuance cost | 240,000 | 273,000
Unsecured private placement 3.86% note [Member] |  |
Debt Instrument [Line Items] |  |
Unamortized debt issuance cost | 195,000 | 236,000
Unsecured private placement 4.86% note [Member] |  |
Debt Instrument [Line Items] |  |
Unamortized debt issuance cost | 78,000 | 108,000
Unsecured private placement 2.30% note [Member] |  |
Debt Instrument [Line Items] |  |
Unamortized debt issuance cost | 75,000 | 0
Unsecured private placement 2.37% note [Member] |  |
Debt Instrument [Line Items] |  |
Unamortized debt issuance cost | $ 85,000 | $ 0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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