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Revenue from Contracts with Customers - Summary of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Net revenues	$ 463,561	$ 554,275
Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues	234,355	348,344
Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues	193,988	205,931
Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues	35,218
Products [Member]
Disaggregation of Revenue [Line Items]
Net revenues	397,363	496,677
Products [Member] | Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues	192,648	304,336
Products [Member] | Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues	178,697	192,341
Products [Member] | Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues	26,018
Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	66,198	57,598
Services [Member] | Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues	41,707	44,008
Services [Member] | Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues	15,291	$ 13,590
Services [Member] | Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues	$ 9,200

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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.

+ References

No definition available.

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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Paragraph 1
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-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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