Business Segment, Geographic Area, Product and Significant Customer Information - Net Revenues by Reportable Segment (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]
Total net revenues	$ 405,140	$ 380,660	$ 325,861	$ 183,681	$ 172,387	$ 209,332	$ 217,966	$ 213,839	$ 1,295,342	$ 813,524	$ 780,869
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Total net revenues									872,291	$ 813,524	$ 780,869
Light & Motion [Member]
Segment Reporting Information [Line Items]
Total net revenues									$ 423,051