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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 |  |
--- | --- | --- | ---
Sep. 28, 2014 | Jun. 30, 2013 | Mar. 31, 2013 | Mar. 30, 2014 | Dec. 31, 2013
Fair Value Measurements |  |  |  |  |
Beginning Balance | $ 2,230 | $ 75 | $ 388 | $ 2,230 | $ 2,230
Fair value adjustment | (630) |  |  |  |
Contingent consideration payments |  | (75) | (313) |  |
Ending Balance | $ 1,600 |  | $ 75 | $ 2,230 | $ 2,230

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