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Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 30, 2014 | Mar. 31, 2013
Fair Value Measurements |  |
Beginning Balance | $ 2,230 | $ 388
Contingent consideration payments |  | (313)
Ending Balance | $ 2,230 | $ 75

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