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Business Segment Information - Summary of Net Sales by Customer Class (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Apr. 01, 2017
Revenue, Major Customer [Line Items] |  |
Total net sales | $ 530,670 | $ 497,969
Customer Concentration Risk [Member] |  |
Revenue, Major Customer [Line Items] |  |
Total net sales | 530,670 | 497,969
Customer Concentration Risk [Member] | Pharmaceutical [Member] |  |
Revenue, Major Customer [Line Items] |  |
Total net sales | 305,328 | 279,810
Customer Concentration Risk [Member] | Industrial [Member] |  |
Revenue, Major Customer [Line Items] |  |
Total net sales | 162,330 | 161,303
Customer Concentration Risk [Member] | Governmental and Academic [Member] |  |
Revenue, Major Customer [Line Items] |  |
Total net sales | $ 63,012 | $ 56,856

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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