v2.4.0.6
Income Taxes - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 29, 2012
Oct. 01, 2011
Sep. 29, 2012
Oct. 01, 2011
Dec. 31, 2011
Income Taxes [Line Items]          
Gross unrecognized tax benefit $ 6,600,000   $ 6,600,000   $ 8,400,000
Unrecognized tax benefit that would affect effective tax rate 5,600,000   5,600,000   7,400,000
Unrecognized tax benefits, interest expensed 0 100,000 100,000 200,000  
Provision for income taxes 5,301,000 3,869,000 15,724,000 17,049,000  
Effective tax rate 28.10% 20.70% 25.00% 25.50%  
Settlement of uncertain income tax positions $ 400,000   $ 2,400,000    
Difference of effective tax rate from statutory U.S. federal income 35.00%