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Business Segment, Geographic Area, Product and Significant Customer Information - Schedule of Capital Expenditures, Depreciation and Amortization Expense and Segment Assets by Reportable Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Capital expenditures	$ 2,794	$ 3,028	$ 9,154	$ 11,040
Depreciation and amortization	4,245	3,640	12,715	10,197
Accounts receivable	98,133		98,133		82,060
Inventory	136,060		136,060		134,639
Total segment assets	234,193		234,193		216,699	274,526
Advanced Manufacturing Capital Equipment [Member]
Segment Reporting Information [Line Items]
Capital expenditures	1,893	2,102	6,599	6,741
Depreciation and amortization	2,861	2,409	8,819	6,797
Accounts receivable	14,645		14,645		9,644
Inventory	107,935		107,935		108,397
Total segment assets	122,580		122,580		118,041
Analytical Solutions Group [Member]
Segment Reporting Information [Line Items]
Capital expenditures	125	283	265	698
Depreciation and amortization	319	248	923	715
Accounts receivable	4,263		4,263		5,889
Inventory	4,354		4,354		3,841
Total segment assets	8,617		8,617		9,730
Europe Region Sales & Service Operations [Member]
Segment Reporting Information [Line Items]
Capital expenditures	24	35	137	109
Depreciation and amortization	86	102	260	305
Accounts receivable	6,611		6,611		5,813
Inventory	3,950		3,950		3,691
Total segment assets	10,561		10,561		9,504
Asia Region Sales & Service Operations [Member]
Segment Reporting Information [Line Items]
Capital expenditures	239	237	435	654
Depreciation and amortization	294	537	876	1,330
Accounts receivable	36,380		36,380		32,088
Inventory	28,532		28,532		29,534
Total segment assets	64,912		64,912		61,622
Corporate, Eliminations and Other [Member]
Segment Reporting Information [Line Items]
Capital expenditures	513	371	1,718	2,838
Depreciation and amortization	685	344	1,837	1,050
Accounts receivable	36,234		36,234		28,626
Inventory	(8,711)		(8,711)		(10,824)
Total segment assets	$ 27,523		$ 27,523		$ 17,802

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