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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 27, 2014
Sep. 27, 2014
Reported Value Measurement
Dec. 28, 2013
Reported Value Measurement
Sep. 27, 2014
Estimate of Fair Value Measurement
Dec. 28, 2013
Estimate of Fair Value Measurement
Sep. 27, 2014
Recurring
Dec. 28, 2013
Recurring
Sep. 27, 2014
Recurring
Level 1
Dec. 28, 2013
Recurring
Level 1
Sep. 27, 2014
Recurring
Level 2
Dec. 28, 2013
Recurring
Level 2
Sep. 27, 2014
Recurring
Level 3
Dec. 28, 2013
Recurring
Level 3
Assets [Abstract]                          
Money market funds and time deposits           $ 5,079 $ 17,090 $ 5,079 $ 17,090 $ 0 $ 0 $ 0 $ 0
Banker's acceptance drafts           9,988 [1] 10,765 [1] 0 [1] 0 [1] 9,988 [1] 10,765 [1] 0 [1] 0 [1]
Forward currency-exchange contracts           169 97 0 0 169 97 0 0
Liabilities [Abstract]                          
Foreign currency-exchange contracts           2 23 0 0 2 23 0 0
Interest rate swap agreement           532 773 0 0 532 773 0 0
Contingent consideration 1,175         1,175 [2]   0 [2]   0 [2]   1,175 [2]  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input [Roll Forward]                          
Balance at beginning of period 0                        
Acquisition 1,205                        
Current period expense 60                        
Currency translation (90)                        
Balance at end of period 1,175                        
Long-term debt obligations   $ 22,375 $ 38,010 $ 22,375 $ 38,010                
[1] Included in accounts receivable in the accompanying condensed consolidated balance sheet.
[2] Included in other current liabilities in the accompanying condensed consolidated balance sheet.