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Business Segment, Geographic Area, Product and Significant Customer Information - Worldwide Net Revenue for Each Group of Products (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
Revenue from External Customer [Line Items]
Net sales from product groups	$ 166,453	$ 141,447	$ 465,026	$ 509,712
Instruments and Control Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	60,615	57,761	184,729	205,654
Power and Reactive Gas Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	72,471	52,031	182,294	199,864
Vacuum Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	18,098	15,435	53,588	53,158
Analytical Solutions Group Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	$ 15,269	$ 16,220	$ 44,415	$ 51,036

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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