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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 obsolete inventory |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | $ 47,119 | $ 45,175 | $ 36,269
Additions Charged to Costs and Expenses | 11,565 | 36,150 | 19,770
Additions Through Acquisition | 1,947 | 0 | 5,165
Other Changes Add (Deduct) | (12,288) | (34,206) | (16,029)
Balance at End of Period | 48,343 | 47,119 | 45,175
Allowance for doubtful accounts receivable |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 10,914 | 19,439 | 8,644
Additions Charged to Costs and Expenses | 1,058 | (965) | 7,085
Additions Through Acquisition | 60 | 0 | 4,644
Other Changes Add (Deduct) | (2,581) | (7,560) | (934)
Balance at End of Period | $ 9,451 | $ 10,914 | $ 19,439

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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