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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		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Disaggregation of Revenue [Line Items]
Total net sales	$ 596,219	$ 558,250	$ 1,126,889	$ 1,056,219
Chemistry Consumables [Member]
Disaggregation of Revenue [Line Items]
Total net sales	99,129	90,824	197,839	178,727
Service [Member]
Disaggregation of Revenue [Line Items]
Total net sales	207,350	185,412	398,903	359,085
Net Sales Recognized at a Point in Time: [Member]
Disaggregation of Revenue [Line Items]
Total net sales	469,266	445,775	880,901	837,573
Net Sales Recognized at a Point in Time: [Member] | Instrument Systems [Member]
Disaggregation of Revenue [Line Items]
Total net sales	289,740	282,014	530,147	518,407
Net Sales Recognized at a Point in Time: [Member] | Chemistry Consumables [Member]
Disaggregation of Revenue [Line Items]
Total net sales	99,129	90,824	197,839	178,727
Net Sales Recognized at a Point in Time: [Member] | Service [Member]
Disaggregation of Revenue [Line Items]
Total net sales	80,397	72,937	152,915	140,439
Net Sales Recognized Over Time: [Member] | Service [Member]
Disaggregation of Revenue [Line Items]
Total net sales	$ 126,953	$ 112,475	$ 245,988	$ 218,646

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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-Name Accounting Standards Codification
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