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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 27, 2014
Goodwill [Line Items] |  |
Goodwill | $ 155,800 | $ 153,515
Hart Systems LLC [Member] |  |
Goodwill [Line Items] |  |
Acquisition - Hart Systems | $ 60,858 | $ 58,573

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