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Financial Instruments, Fair Value, and Concentrations of Credit Risk - Summary of Certain Amounts Related to Hedging Activities (Detail) - Cash Flow Hedges [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Fair Value Concentration Of Risk Financial Statement Captions [Line Items]
Amount of Gain (Loss) Recognized in AOCI		$ 17
Amount of Gain (Loss) Reclassified to Earnings	$ 17	(81)
Commodity Contracts [Member]
Fair Value Concentration Of Risk Financial Statement Captions [Line Items]
Amount of Gain (Loss) Recognized in AOCI		17
Amount of Gain (Loss) Reclassified to Earnings	$ 17	$ (81)

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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