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Statement of Cash Flows - Noncash Investing and Financing Activities - Additional Information (Detail) - USD ($) | 12 Months Ended
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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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