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Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allowance for Doubtful Accounts |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | $ 2,219 | $ 2,356 | $ 2,407
Additions Charged to Cost and Expenses |  | 4 |
Other | 20 |  |
Deductions | 566 | 141 | 51
Balance at End of Period | 1,673 | 2,219 | 2,356
Inventory Reserve |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 102,896 | 116,016 | 119,376
Additions Charged to Cost and Expenses | 11,242 | 8,844 | 17,493
Other | 368 | (126) | 4,417
Deductions | 13,727 | 21,838 | 25,270
Balance at End of Period | 100,779 | 102,896 | 116,016
Valuation Allowance of Deferred Tax Assets |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 63,919 | 48,369 | 43,039
Additions Charged to Cost and Expenses | 6,333 | 15,571 | 5,413
Other |  |  |
Deductions | 400 | 21 | 83
Balance at End of Period | $ 69,852 | $ 63,919 | $ 48,369

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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) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense. + 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) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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