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Goodwill - Additional Information (Detail) (USD $)
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0 Months Ended | 12 Months Ended | |||
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Nov. 01, 2013
Reporting_Unit
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Goodwill [Line Items] | |||||
| Number of reportable units | 6 | ||||
| Goodwill impairment charge | $ 0 | $ 0 | $ 2,400,000 | $ 0 | |
| Goodwill | 100,998,000 | 21,923,000 | 17,185,000 | ||
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Test Systems [Member]
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| Goodwill [Line Items] | |||||
| Goodwill | $ 0 | $ 0 | |||
| X | ||||||||||
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- Definition
Number of reportable units. No definition available.
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| X | ||||||||||
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- Definition
Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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