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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