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Fair Value of Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Assets:    
Investments $ 11,561 $ 12,095
Energy Marketing Contracts Assets, Current 7,516 7,076
Liabilities:    
Energy Marketing Contract Liabilities, Current 484 743
Equity Securities [Member]    
Assets:    
Investments 27 26
Quoted Prices in Active Markets (Level 1) [Member]    
Assets:    
Assets, Fair Value Disclosure 9,457 10,059
Quoted Prices in Active Markets (Level 1) [Member] | Equity Securities [Member]    
Assets:    
Investments 27 26
Quoted Prices in Active Markets (Level 1) [Member] | Investments - Mutual funds and other [Member]    
Assets:    
Investments 9,430 10,033
Quoted Prices in Active Markets (Level 1) [Member] | Total Investments [Member]    
Assets:    
Investments 9,457 10,059
Significant Other Observable Inputs (Level 2) [Member]    
Assets:    
Assets, Fair Value Disclosure 7,516 7,076
Significant Unobservable Inputs (Level 3) [Member]    
Assets:    
Assets, Fair Value Disclosure 2,104 2,036
Significant Unobservable Inputs (Level 3) [Member] | Investments in guaranteed income fund [Member]    
Assets:    
Investments 2,104 2,036
Significant Unobservable Inputs (Level 3) [Member] | Total Investments [Member]    
Assets:    
Investments 2,104 2,036
Recurring [Member]    
Assets:    
Assets, Fair Value Disclosure 19,077 19,171
Liabilities:    
Energy Marketing Contract Liabilities, Current   743
Recurring [Member] | Equity Securities [Member]    
Assets:    
Investments 27 26
Recurring [Member] | Investments in guaranteed income fund [Member]    
Assets:    
Investments 2,104 2,036
Recurring [Member] | Investments - Mutual funds and other [Member]    
Assets:    
Investments   10,033
Recurring [Member] | Total Investments [Member]    
Assets:    
Investments $ 11,561 12,095
Recurring [Member] | Mark To Market Energy Assets incl. natural gas and swap agreements[Member]    
Assets:    
Derivative assets   $ 7,076