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Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for Doubtful Accounts |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | $ 1,736 | $ 1,673 | $ 2,219
Additions Charged to Cost and Expenses | 356 | 87 | 0
Other | 32 | 28 | 20
Deductions | 90 | 52 | 566
Balance at End of Period | 2,034 | 1,736 | 1,673
Inventory Reserve |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 103,556 | 100,779 | 102,896
Additions Charged to Cost and Expenses | 17,534 | 15,244 | 11,242
Other | (521) | (85) | 368
Deductions | 9,982 | 12,382 | 13,727
Balance at End of Period | 110,587 | 103,556 | 100,779
Valuation Allowance of Deferred Tax Assets |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 77,177 | 69,852 | 63,919
Additions Charged to Cost and Expenses | 7,785 | 7,325 | 6,333
Other | 0 |  | 0
Deductions | 0 |  | 400
Balance at End of Period | $ 84,962 | $ 77,177 | $ 69,852

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- Definition Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column D)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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