Business Segment, Geographic Area, Product and Significant Customer Information - Schedule of Gross Profit 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]
Gross profit	$ 79,325	$ 62,234	$ 248,332	$ 178,894
Operating Segments [Member] | Advanced Manufacturing Capital Equipment [Member]
Segment Reporting Information [Line Items]
Gross profit	61,887	43,151	191,049	121,647
Operating Segments [Member] | Analytical Solutions Group [Member]
Segment Reporting Information [Line Items]
Gross profit	7,667	6,758	22,066	21,239
Operating Segments [Member] | Europe Region Sales & Service Operations [Member]
Segment Reporting Information [Line Items]
Gross profit	4,221	3,427	12,082	10,005
Operating Segments [Member] | Asia Region Sales & Service Operations [Member]
Segment Reporting Information [Line Items]
Gross profit	7,974	11,580	30,639	31,366
Corporate, Eliminations and Other [Member]
Segment Reporting Information [Line Items]
Gross profit	$ (2,424)	$ (2,682)	$ (7,504)	$ (5,363)