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Goodwill (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 28, 2013
Dec. 29, 2012
Sep. 29, 2012
Sep. 28, 2013
item
Sep. 29, 2012
Dec. 31, 2011
Goodwill            
Number of reporting units       1    
Goodwill impairment $ 0 $ 71,400,000 $ 0      
Changes in the carrying amount of goodwill            
Balance at the beginning of the period, gross   142,882,000   142,658,000 141,153,000  
Goodwill adjustments related to acquisition       5,358,000    
Goodwill adjustments related to sale of practice         (29,000)  
Goodwill adjustments related to NeuCo       (63,000)    
Effect of foreign currency translation       (34,000) 1,758,000  
Balance at the end of the period, gross 147,919,000 142,658,000 142,882,000 147,919,000 142,882,000  
Accumulated impairment losses (71,893,000) (71,893,000) (499,000) (71,893,000) (499,000) (499,000)
Balance at the beginning of the period, net   142,383,000   70,765,000 140,654,000  
Balance at the end of the period, net $ 76,026,000 $ 70,765,000 $ 142,383,000 $ 76,026,000 $ 142,383,000