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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
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2017
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
Segment Reporting Information [Line Items]                        
Gross profit   $ 238,326 $ 227,995 $ 219,583 $ 205,547 $ 183,408 $ 168,385 $ 135,913 $ 77,913 $ 891,451 $ 565,619 $ 362,872
Research and development                   132,555 110,579 68,305
Selling, general and administrative                   290,548 229,171 129,087
Acquisition and integration costs                   5,332 27,279 30
Restructuring                   3,920 642 2,074
Asset impairment                   6,719 5,000  
Amortization of intangible assets                   45,743 35,681 6,764
Income from operations   120,016 110,155 92,883 83,580 62,514 53,008 19,186 22,559 406,634 157,267 156,612
Interest income                   3,021 2,560 2,999
Interest expense                   30,990 30,611 143
Gain on sale of business $ 74,856                 74,856    
Other expense, net                   5,896 1,239  
Income before income taxes                   447,625 127,977 159,468
Provision for income taxes                   108,493 23,168 37,171
Net income   $ 77,638 $ 75,994 $ 120,440 $ 65,060 $ 45,487 $ 32,549 $ 9,210 $ 17,563 339,132 104,809 122,297
Vacuum & Analysis [Member]                        
Segment Reporting Information [Line Items]                        
Gross profit                   551,078 388,220 $ 362,872
Light & Motion [Member]                        
Segment Reporting Information [Line Items]                        
Gross profit                   $ 340,373 $ 177,399