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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Net revenues	$ 462,451	$ 487,152	$ 1,400,122	$ 1,614,567
Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues	240,681	286,038	710,691	1,002,710
Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues	172,460	201,114	549,027	611,857
Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues	49,310		140,404
Products [Member]
Disaggregation of Revenue [Line Items]
Net revenues	386,173	426,255	1,184,862	1,432,931
Products [Member] | Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues	197,203	239,924	581,611	865,714
Products [Member] | Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues	156,436	186,331	502,496	567,217
Products [Member] | Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues	32,534		100,755
Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	76,278	60,897	215,260	181,636
Services [Member] | Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues	43,478	46,114	129,080	136,996
Services [Member] | Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues	16,024	$ 14,783	46,531	$ 44,640
Services [Member] | Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues	$ 16,776		$ 39,649

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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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