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Revenue From Contracts With Customers - Summary of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Total net revenues	$ 487,152	$ 486,267	$ 1,614,567	$ 1,404,177
Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Total net revenues	286,038	308,269	1,002,710	896,214
Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Total net revenues	201,114	177,998	611,857	507,963
Products [Member]
Disaggregation of Revenue [Line Items]
Total net revenues	426,255	428,891	1,432,931	1,243,146
Products [Member] | Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Total net revenues	239,924	265,136	865,714	776,256
Products [Member] | Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Total net revenues	186,331	163,755	567,217	466,890
Services [Member]
Disaggregation of Revenue [Line Items]
Total net revenues	60,897	57,376	181,636	161,031
Services [Member] | Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Total net revenues	46,114	43,133	136,996	119,958
Services [Member] | Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Total net revenues	$ 14,783	$ 14,243	$ 44,640	$ 41,073

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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://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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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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