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Fair Value - Additional Information (Detail) (USD $)
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1 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 28, 2013
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Dec. 31, 2012
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Jul. 30, 2012
Max-Viz, Inc. [Member]
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Dec. 31, 2012
Max-Viz, Inc. [Member]
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Sep. 28, 2013
Level 3 [Member]
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Dec. 31, 2012
Level 3 [Member]
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Sep. 28, 2013
Level 3 [Member]
Max-Viz, Inc. [Member]
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Sep. 28, 2013
Level 3 [Member]
Ballard [Member]
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Dec. 31, 2012
Test Systems [Member]
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Sep. 28, 2013
Test Systems [Member]
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Sep. 28, 2013
Maximum [Member]
Level 3 [Member]
Max-Viz, Inc. [Member]
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Sep. 28, 2013
Maximum [Member]
Level 3 [Member]
Ballard [Member]
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| Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ||||||||||||
| Revenue growth target period | 3 years | 3 years | 4 years | |||||||||
| Contingent consideration on fair value liabilities | $ 755,000 | $ 814,000 | $ 755,000 | $ 814,000 | $ 8,000,000 | $ 5,500,000 | ||||||
| Total amortized intangible assets | 3,900,000 | |||||||||||
| Change in fair value of goodwill and intangible assets | $ 0 | $ 0 | ||||||||||