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Goodwill (Details) (USD $)
 6 Months Ended
Jun. 28, 2014
item
Jun. 29, 2013
Goodwill    
Number of reporting units 1  
Goodwill impairment $ 0 $ 0
Changes in the carrying amount of goodwill    
Balance at the beginning of the period, gross 153,466,000 142,658,000
Goodwill adjustments related to acquisitions 1,829,000 5,358,000
Goodwill adjustments related to NeuCo   (63,000)
Effect of foreign currency translation 494,000 (787,000)
Balance at the end of the period, gross 155,789,000 147,166,000
Balance at the beginning of the period, Accumulated impairment losses (71,893,000) (71,893,000)
Balance at the end of the period, Accumulated impairment losses (71,893,000) (71,893,000)
Balance at the beginning of the period, net 81,573,000 70,765,000
Balance at the end of the period, net $ 83,896,000 $ 75,273,000