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Business Segment Information - Summary of Net Sales of Company Recognized at a Point in Time Versus Over Time (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Disaggregation of Revenue [Line Items]
Total net sales	$ 577,278	$ 578,021	$ 1,690,302	$ 1,704,910
Chemistry Consumables [Member]
Disaggregation of Revenue [Line Items]
Total net sales	100,256	95,979	299,801	293,818
Service [Member]
Disaggregation of Revenue [Line Items]
Total net sales	206,705	199,499	611,961	598,402
Net Sales Recognized at a Point in Time: [Member]
Disaggregation of Revenue [Line Items]
Total net sales	445,813	454,291	1,311,147	1,335,193
Net Sales Recognized at a Point in Time: [Member] | Instrument Systems [Member]
Disaggregation of Revenue [Line Items]
Total net sales	270,317	282,543	778,540	812,690
Net Sales Recognized at a Point in Time: [Member] | Chemistry Consumables [Member]
Disaggregation of Revenue [Line Items]
Total net sales	100,256	95,979	299,801	293,818
Net Sales Recognized at a Point in Time: [Member] | Service [Member]
Disaggregation of Revenue [Line Items]
Total net sales	75,240	75,769	232,806	228,685
Net Sales Recognized Over Time: [Member] | Service [Member]
Disaggregation of Revenue [Line Items]
Total net sales	$ 131,465	$ 123,730	$ 379,155	$ 369,717

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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