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Fair Value of Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets: |  |
Investments | $ 9,680 | $ 9,229
Energy Marketing Contracts Assets, Current | 1,967 | 0
Liabilities: |  |
Energy Marketing Contract Liabilities, Current | 439 | 1,844
Equity Securities [Member] |  |
Assets: |  |
Investments | 17 | 27
Quoted Prices in Active Markets (Level 1) [Member] |  |
Assets: |  |
Assets, Fair Value Disclosure | 7,551 | 8,426
Quoted Prices in Active Markets (Level 1) [Member] | Equity Securities [Member] |  |
Assets: |  |
Investments | 17 | 27
Quoted Prices in Active Markets (Level 1) [Member] | Investments - Mutual funds and other [Member] |  |
Assets: |  |
Investments | 7,534 | 8,399
Quoted Prices in Active Markets (Level 1) [Member] | Total Investments [Member] |  |
Assets: |  |
Investments | 7,551 | 8,426
Significant Other Observable Inputs (Level 2) [Member] |  |
Assets: |  |
Assets, Fair Value Disclosure | 1,967 | 0
Significant Unobservable Inputs (Level 3) [Member] |  |
Assets: |  |
Assets, Fair Value Disclosure | 2,129 | 803
Significant Unobservable Inputs (Level 3) [Member] | Investments in guaranteed income fund [Member] |  |
Assets: |  |
Investments | 2,129 | 803
Significant Unobservable Inputs (Level 3) [Member] | Total Investments [Member] |  |
Assets: |  |
Investments | 2,129 | 803
Recurring [Member] |  |
Assets: |  |
Assets, Fair Value Disclosure | 11,647 | 9,229
Liabilities: |  |
Energy Marketing Contract Liabilities, Current |  | 1,844
Recurring [Member] | Equity Securities [Member] |  |
Assets: |  |
Investments | 17 | 27
Recurring [Member] | Investments in guaranteed income fund [Member] |  |
Assets: |  |
Investments | 2,129 | 803
Recurring [Member] | Investments - Mutual funds and other [Member] |  |
Assets: |  |
Investments |  | 8,399
Recurring [Member] | Total Investments [Member] |  |
Assets: |  |
Investments | $ 9,680 | 9,229
Recurring [Member] | Mark To Market Energy Assets incl. natural gas and swap agreements[Member] |  |
Assets: |  |
Derivative assets |  | $ 0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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