Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) shares in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (1,379,000)	$ 1,303,000	$ 1,303,000
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(126,000)	2,498,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(478,000)	(1,951,000)
Net current-period other comprehensive income (loss)	(604,000)	547,000
Ending balance	(1,983,000)	1,850,000	$ (1,379,000)
Stock Issued During Period, Shares, Dividend Reinvestment Plan			0.1
Stock Issued During Period, Value, Dividend Reinvestment Plan			$ 136.26
Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan			$ 4,500,000
Stock Issued During Period, Shares, Dividend Reinvestment Plan			0.1
Stock Issued During Period, Value, Dividend Reinvestment Plan			$ 136.26
Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan			4,500,000
Maximum [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Proceeds from Stock Plans	75,000,000
Proceeds from Stock Plans	75,000,000
UnrealizedGainsLossesFromDefinedBenefitPensionAndPostretirementPlanItems [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(2,506,000)	(3,268,000)	(3,268,000)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	10,000	18,000
Net current-period other comprehensive income (loss)	10,000	18,000
Ending balance	(2,496,000)	(3,250,000)	(2,506,000)
Accumulated (Gain) Loss from Commodity Contracts Cash Flows Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1,092,000	4,571,000	4,571,000
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	22,000	2,498,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(440,000)	(1,969,000)
Net current-period other comprehensive income (loss)	(418,000)	529,000
Ending balance	674,000	5,100,000	1,092,000
Accumulated (Gain) Loss from Interest Rate Swap Cash Flows Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	35,000	0	0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(148,000)	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(48,000)	0
Net current-period other comprehensive income (loss)	(196,000)	0
Ending balance	$ (161,000)	$ 0	$ 35,000