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Summary of Significant Accounting Policies - Summary of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	$ 460,541	$ 487,152	$ 573,140	$ 554,275	$ 511,800	$ 486,267	$ 480,757	$ 437,153	$ 2,075,108	$ 1,915,977	$ 1,295,342
Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue									1,260,862	1,207,457	872,291
Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue									814,246	708,520	423,051
Products [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue									1,835,202	1,701,301	1,118,579
Products [Member] | Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue									1,080,343	1,047,639	731,364
Products [Member] | Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue									754,859	653,662	387,215
Services [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue									239,906	214,676	176,763
Services [Member] | Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue									180,519	159,818	140,927
Services [Member] | Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue									$ 59,387	$ 54,858	$ 35,836

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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
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

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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