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Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) - Reclassifications of Accumulated Other Comprehensive Loss (Detail) - USD ($)
shares in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Amortization of pension and postretirement items:      
Tax benefit $ (13,506,000) $ (12,401,000)  
Derivative, Gain (Loss) on Derivative, Net $ 3,491,000 3,253,000  
Stock Issued During Period, Shares, Dividend Reinvestment Plan 0.1   0.1
Stock Issued During Period, Value, Dividend Reinvestment Plan $ 137.45   $ 125.71
Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan 3,200,000   $ 15,200,000
Reclassification out of Accumulated Other Comprehensive Income [Member]      
Amortization of pension and postretirement items:      
Net of tax 1,951,000 2,145,000  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member]      
Amortization of pension and postretirement items:      
Prior service cost [1] 19,000 19,000  
Net loss [1] (43,000) (104,000)  
Total before tax (24,000) (85,000)  
Tax benefit 6,000 22,000  
Net of tax (18,000) (63,000)  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated (Gain) Loss from Commodity Contracts Cash Flows Hedges [Member]      
Amortization of pension and postretirement items:      
Tax benefit (752,000) (842,000)  
Net of tax 1,969,000 2,205,000  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated (Gain) Loss from Interest Rate Swap Cash Flows Hedges [Member]      
Amortization of pension and postretirement items:      
Other Comprehensive Income Loss Adjustments AOCI Swap Agreements   4,000  
Tax benefit 0 (1,000)  
Net of tax 0 3,000  
Propane Swap Agreement [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated (Gain) Loss from Commodity Contracts Cash Flows Hedges [Member]      
Amortization of pension and postretirement items:      
Other Comprehensive Income Loss Adjustments AOCI Swap Agreements [2] 2,721,000 3,047,000  
Interest Rate Swap [Member] | Derivatives designated as hedging instrument [Member] | Interest Expense [Member]      
Amortization of pension and postretirement items:      
Derivative, Gain (Loss) on Derivative, Net $ 0 $ 4,000  
[1] These amounts are included in the computation of net periodic costs (benefits). See Note 10, Employee Benefit Plans, for additional details.
[2] These amounts are included in the effects of gains and losses from derivative instruments. See Note 13, Derivative Instruments, for additional details.