Business Segment, Geographic Area, Product and Significant Customer Information - Net Revenues by Reportable Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Total net revenues	$ 186,798	$ 166,453	$ 577,848	$ 465,026
Operating Segments [Member] | Advanced Manufacturing Capital Equipment [Member]
Segment Reporting Information [Line Items]
Total net revenues	152,901	132,856	472,837	362,153
Operating Segments [Member] | Analytical Solutions Group [Member]
Segment Reporting Information [Line Items]
Total net revenues	15,079	13,313	44,549	41,217
Operating Segments [Member] | Europe Region Sales & Service Operations [Member]
Segment Reporting Information [Line Items]
Total net revenues	14,295	12,436	41,337	35,287
Operating Segments [Member] | Asia Region Sales & Service Operations [Member]
Segment Reporting Information [Line Items]
Total net revenues	55,416	52,558	177,914	149,267
Corporate, Eliminations and Other [Member]
Segment Reporting Information [Line Items]
Total net revenues	$ (50,893)	$ (44,710)	$ (158,789)	$ (122,898)