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Restructuring - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Jul. 01, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Effects on Future Earnings and Cash Flows Resulting from Exit Plan [Line Items]        
Restructuring and Related Cost, Expected Number of Positions Eliminated 160 145    
Percent of workforce related to restructuring 7.00%      
Reduction in number of employees   140    
Total charges expected to be incurred     $ 6,400,000  
Employee termination costs   5,900,000    
Other transitional cost   500,000    
Restructuring charges 5,900,000 4,429,000 5,855,000 2,780,000
Reversal of prior-year restructuring charges   0    
Contract Termination [Member]
       
Effects on Future Earnings and Cash Flows Resulting from Exit Plan [Line Items]        
Restructuring charges   4,800,000 5,300,000 500,000
Reversal of prior-year restructuring charges   300,000    
Contract Termination [Member] | 2012 Restructuring Plan
       
Effects on Future Earnings and Cash Flows Resulting from Exit Plan [Line Items]        
Restructuring charges   4,800,000    
Reversal of restructuring charges   1,100,000    
2011 Restructuring Charges [Member]
       
Effects on Future Earnings and Cash Flows Resulting from Exit Plan [Line Items]        
Percent of workforce related to restructuring     2.00%  
Total charges expected to be incurred   5,900,000    
Employee termination costs     5,400,000  
Other transitional cost     500,000  
2009 And 2010 Restructuring Charges [Member]
       
Effects on Future Earnings and Cash Flows Resulting from Exit Plan [Line Items]        
Cash payments to restructuring plan       $ 3,600,000