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Restructuring Charges (Details) (USD $)
 6 Months Ended 6 Months Ended 3 Months Ended
Jun. 29, 2013
Jun. 29, 2013
Deferred rent and other non-current liabilities
Jun. 29, 2013
Current portion of deferred rent
Jun. 29, 2013
Office Vacancies
Jun. 30, 2012
Office Vacancies
Jun. 29, 2013
Employee Workforce Reduction
Jun. 30, 2012
London office surrender
item
Jun. 30, 2012
London office surrender
Lease surrender
Jun. 30, 2012
London office surrender
Other restructuring
Jun. 30, 2012
Houston office space adjustments
Jun. 30, 2012
Houston office space adjustments
Selling, general and administrative expenses
Jun. 30, 2012
Houston office space adjustments
Depreciation and amortization expense
Restructuring reserve balance                        
Balance at the beginning of the period $ 2,979,000 $ 600,000 $ 900,000 $ 2,106,000 $ 3,737,000 $ 873,000            
Charges incurred         1,916,000   1,700,000   1,100,000 1,400,000 200,000 1,100,000
Amounts paid (1,167,000)     (451,000) (2,185,000) (716,000)            
Adjustments and effect of foreign currency translation (321,000)     (177,000) (560,000) (144,000)            
Balance at the end of the period 1,491,000 600,000 900,000 1,478,000 2,908,000 13,000            
Pre-tax restructuring credit related to adjustments of leased office space in Houston, TX                   400,000    
Number of floors under lease surrendered             1          
Number of floors under lease             3          
Amount paid for lease surrender               $ 1,200,000