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Restructuring Charges (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Restructuring reserve balance    
Balance at the beginning of the period   $ 2,979
Amounts paid, net of amounts received   (1,418)
Adjustments and effect of foreign currency translation   (321)
Balance at the end of the period   1,240
Office Vacancies
    
Restructuring reserve balance    
Balance at the beginning of the period 1,170 2,106
Amounts paid, net of amounts received (549) (689)
Adjustments and effect of foreign currency translation 20 (177)
Balance at the end of the period 641 1,240
Employee Workforce Reduction
    
Restructuring reserve balance    
Balance at the beginning of the period   873
Amounts paid, net of amounts received   (729)
Adjustments and effect of foreign currency translation   $ (144)