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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.

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