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Revenue from Contracts with Customers - Summary of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Net revenues	$ 499,651	$ 462,451	$ 474,110	$ 463,561	$ 460,541	$ 487,152	$ 573,140	$ 554,275	$ 1,899,773	$ 2,075,108	$ 1,915,977
Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues									990,523	1,260,862	1,207,457
Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues									725,570	814,246	708,520
Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues									183,680
Products [Member]
Disaggregation of Revenue [Line Items]
Net revenues									1,611,297	1,835,202	1,701,301
Products [Member] | Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues									819,078	1,080,343	1,047,639
Products [Member] | Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues									663,730	754,859	653,662
Products [Member] | Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues									128,489
Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues									288,476	239,906	214,676
Services [Member] | Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues									171,445	180,519	159,818
Services [Member] | Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues									61,840	$ 59,387	$ 54,858
Services [Member] | Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues									$ 55,191

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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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