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Business Segment, Geographic Area, Product and Significant Customer Information - Worldwide Net Revenue for Each Group of Products (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue from External Customer [Line Items]
Net sales from product groups	$ 511,800	$ 486,267	$ 480,757	$ 437,153	$ 405,140	$ 380,660	$ 325,861	$ 183,681	$ 1,915,977	$ 1,295,342	$ 813,524
Analytical and Control Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups									131,376	115,758	102,658
Power Plasma and Reactive Gas Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups									564,343	367,665	350,469
Vacuum Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups									511,738	388,868	$ 360,397
Laser Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups									225,168	124,432
Optics Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups									203,775	124,218
Photonics Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups									$ 279,577	$ 174,401

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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