Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional information (Detail)

Income Taxes - Additional information (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Income Taxes [Line Items]    
Effective income tax rate 21.00% 22.20%
Net discrete tax Benefits $ 14.4  
Tax benefit related to retroactive extension of tax credits 8.3  
Realization of unrecognized tax benefits 6.9  
Tax reduction due to discrete items 2.80% 4.30%
Increase in unrecognized tax benefits and associated interest 2.7  
Net unrecognized tax benefits and interest, if recognized, would reduce the annual effective tax rate 119.8  
Reduction in income tax expenses 15.0  
Possible decrease in unrecognized income tax benefits $ 44.1