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Restructuring Charges (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Restructuring reserve balance    
Balance at the beginning of the period $ 2,979  
Amounts paid, net of amounts received, during the first quarter (545)  
Adjustments and effect of foreign currency translation during the first quarter (183)  
Balance at the end of the period 2,251  
Deferred rent and other non-current liabilities
    
Restructuring reserve balance    
Balance at the end of the period 900  
Current portion of deferred rent
    
Restructuring reserve balance    
Balance at the end of the period 900  
Accrued expenses
    
Restructuring reserve balance    
Balance at the end of the period 500  
Selling, general and administrative expenses
    
Restructuring reserve balance    
Pre-tax expenses associated principally with vacant leased office space.   500
Office Vacancies
    
Restructuring reserve balance    
Balance at the beginning of the period 2,106 3,737
Charges incurred   545
Amounts paid, net of amounts received, during the first quarter (147) (595)
Adjustments and effect of foreign currency translation during the first quarter (177) 7
Balance at the end of the period 1,782 3,694
Employee Workforce Reduction
    
Restructuring reserve balance    
Balance at the beginning of the period 873  
Amounts paid, net of amounts received, during the first quarter (398)  
Adjustments and effect of foreign currency translation during the first quarter (6)  
Balance at the end of the period $ 469