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Restructuring Charges (Details) (USD $)
 3 Months Ended 6 Months Ended 7 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Jul. 02, 2011
Restructuring expenses and the reserve balance      
Balance at the beginning of the period     $ 5,427,000
Charges incurred     1,020,000
Amounts paid     (1,859,000)
Non-cash adjustments and effect of foreign currency translation     (331,000)
Balance at the end of the period     4,257,000
Office Vacancies
      
Restructuring Charges      
Pre-tax restructuring credit related to adjustments of leased office space in Houston, TX 400,000    
Restructuring expenses and the reserve balance      
Balance at the beginning of the period   3,737,000 4,476,000
Charges incurred   1,916,000 1,020,000
Amounts paid   (2,185,000) (1,251,000)
Non-cash adjustments and effect of foreign currency translation   (560,000) (37,000)
Balance at the end of the period 2,908,000 2,908,000 4,208,000
Office Vacancies | Deferred rent and other non-current liabilities
      
Restructuring expenses and the reserve balance      
Balance at the end of the period 1,600,000 1,600,000  
Office Vacancies | Current portion of deferred rent
      
Restructuring expenses and the reserve balance      
Balance at the end of the period 1,300,000 1,300,000  
Agreement to surrender the lease of a floor in the office building in London
      
Restructuring Charges      
Number of floors under lease surrendered 1    
Number of floors under lease 3 3  
Amount paid for lease surrender 1,200,000    
Restructuring charges related to fixed asset write-offs and other charges or offsets 1,100,000    
Restructuring expenses and the reserve balance      
Charges incurred 1,700,000    
Amounts paid (1,400,000)    
Agreement to surrender the lease of a floor in the office building in London | Depreciation and amortization expense
      
Restructuring expenses and the reserve balance      
Amounts paid (1,100,000)    
Agreement to surrender the lease of a floor in the office building in London | Selling, general and administrative expenses
      
Restructuring expenses and the reserve balance      
Amounts paid (200,000)    
Employee Workforce Reduction
      
Restructuring expenses and the reserve balance      
Balance at the beginning of the period     951,000
Amounts paid     (608,000)
Non-cash adjustments and effect of foreign currency translation     (294,000)
Balance at the end of the period     $ 49,000