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Fair Value of Financial Instruments - Summary of Changes in Fair Value of Investments (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Investments, at fair value | $ 11,561 |  | $ 12,095
Derivative assets, at fair value | 7,516 |  | 7,076
Energy Marketing Contract Liabilities, Current | 484 |  | 743
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | (71) | $ (38) |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Beginning Balance | 2,036 | 2,156 |
Purchases and adjustments | 131 | 22 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 0 | 0 |
Investment Income | 8 | 8 |
Ending Balance | 2,104 | $ 2,148 |
Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Assets, Fair Value Disclosure | 9,457 |  | 10,059
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Assets, Fair Value Disclosure | 7,516 |  | 7,076
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Assets, Fair Value Disclosure | 2,104 |  | 2,036
Recurring [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Assets, Fair Value Disclosure | 19,077 |  | 19,171
Energy Marketing Contract Liabilities, Current |  |  | 743
Equity Securities [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Investments, at fair value | 27 |  | 26
Equity Securities [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Investments, at fair value | 27 |  | 26
Equity Securities [Member] | Recurring [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Investments, at fair value | 27 |  | 26
Investments in guaranteed income fund [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Investments, at fair value | 2,104 |  | 2,036
Investments in guaranteed income fund [Member] | Recurring [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Investments, at fair value | 2,104 |  | 2,036
Investments - Mutual funds and other [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Investments, at fair value | 9,430 |  | 10,033
Investments - Mutual funds and other [Member] | Recurring [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Investments, at fair value |  |  | 10,033
Total Investments [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Investments, at fair value | 9,457 |  | 10,059
Total Investments [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Investments, at fair value | 2,104 |  | 2,036
Total Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Investments, at fair value | $ 11,561 |  | 12,095
Mark To Market Energy Assets Including Put Option [Member] | Recurring [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Derivative Asset |  |  | $ 7,076

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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://www.xbrl.org/2003/role/disclosureRef -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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 Reference 3: 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=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -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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