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Restructuring Charges (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 29, 2014
Mar. 30, 2013
Restructuring reserve balance    
Balance at the beginning of the period   $ 2,979
Amounts paid, net of amounts received   (545)
Adjustments and effect of foreign currency translation   (183)
Balance at the end of the period   2,251
Current portion of deferred rent
    
Restructuring reserve balance    
Balance at the end of the period 700  
Deferred rent and facility-related non-current liabilities
    
Restructuring reserve balance    
Balance at the end of the period 100  
Office Vacancies
    
Restructuring reserve balance    
Balance at the beginning of the period 1,170 2,106
Amounts paid, net of amounts received (231) (147)
Adjustments and effect of foreign currency translation (53) (177)
Balance at the end of the period 886 1,782
Employee Workforce Reduction
    
Restructuring reserve balance    
Balance at the beginning of the period   873
Amounts paid, net of amounts received   (398)
Adjustments and effect of foreign currency translation   (6)
Balance at the end of the period   $ 469