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Statement of Cash Flows - Noncash Investing and Financing Activities - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Supplemental Cash Flow Elements [Line Items]
Noncash investing activities, payables incurred for property, plant and equipment expenditures, unpaid	$ 17,946,000	$ 16,890,000	$ 15,119,000
Common Stock [Member] | Stock Award Plan [Member]
Supplemental Cash Flow Elements [Line Items]
Noncash financing activities shares issued	58,282	96,095	99,497
Noncash financing activities issued value	$ 5,485,000	$ 8,893,000	$ 7,931,000

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Noncash financing activities includes shares issued.

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Noncash or part noncash investing activities payables incurred for property, plant and equipment expenditures unpaid.

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Supplemental cash flow elements.

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- Definition

The fair value of stock issued in noncash financing activities.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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