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Acquisitions - Additional Information (Detail) (USD $) | 9 Months Ended |  | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 28, 2014 | Sep. 29, 2013 | Dec. 29, 2013 | Sep. 28, 2014 Johnson City And Morristown Territory Acquisition [Member] | May 23, 2014 Johnson City And Morristown Territory Acquisition [Member]
Business Acquisition [Line Items] |  |  |  |  |
Effective date of business acquisition |  |  |  | May 23, 2014 |
Cash purchase | $ 12,163,000 | $ 0 |  | $ 12,163,000 |
Goodwill | 103,294,000 | 102,049,000 | 102,049,000 | 1,245,000 | 1,245,000
Contingent consideration liability | 13,000,000 |  |  | 13,000,000 |
Goodwill recognized, expected to be deductible for tax purposes |  |  |  | 0 |
Contingent consideration liability range, low |  |  |  | 1,000,000 |
Contingent consideration liability range, high |  |  |  | $ 1,800,000 |

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