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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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Segment Reporting Information [Line Items]        
Gross profit $ 135,913 $ 98,798 $ 213,826 $ 195,844
Research and development 28,214 17,567 45,441 34,247
Selling, general and administrative 71,429 33,269 105,379 64,136
Acquisition costs 8,205   10,699 30
Restructuring 24 219 24 1,007
Amortization of intangible assets 8,855 1,709 10,538 3,380
Income from operations 19,186 46,034 41,745 93,044
Interest and other (expense) income, net (6,818) 790 (5,572) 1,294
Income before income taxes 12,368 46,824 36,173 94,338
Provision for income taxes 3,158 13,604 9,400 27,332
Net income 9,210 33,220 26,773 67,006
Vacuum & Analysis Division [Member]        
Segment Reporting Information [Line Items]        
Gross profit 90,859 $ 98,798 168,772 $ 195,844
Light & Motion Division [Member]        
Segment Reporting Information [Line Items]        
Gross profit $ 45,054   $ 45,054