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Business Segment, Geographic Area, Product and Significant Customer Information - Reconciliation of Segment Gross Profit to Consolidated Net Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]                      
Gross profit $ 183,408 $ 168,385 $ 135,913 $ 77,913 $ 72,799 $ 94,229 $ 98,798 $ 97,046 $ 565,619 $ 362,872 $ 337,766
Research and development                 110,579 68,305 62,888
Selling, general and administrative                 229,171 129,087 131,828
Acquisition and integration costs                 27,279 30 499
Restructuring                 642 2,074 2,464
Asset impairment                 5,000    
Amortization of intangible assets                 35,681 6,764 4,945
Income from operations 62,514 53,008 19,186 22,559 22,205 41,363 46,034 47,010 157,267 156,612 135,142
Interest income                 2,560 2,999 1,323
Interest expense                 30,611 143 72
Other expense, net                 1,239    
Income before income taxes                 127,977 159,468 136,393
Provision for income taxes                 23,168 37,171 20,615
Net income $ 45,487 $ 32,549 $ 9,210 $ 17,563 $ 25,522 $ 29,769 $ 33,220 $ 33,786 104,809 122,297 115,778
Vacuum & Analysis [Member]                      
Segment Reporting Information [Line Items]                      
Gross profit                 388,220 $ 362,872 $ 337,766
Light & Motion [Member]                      
Segment Reporting Information [Line Items]                      
Gross profit                 $ 177,399