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Schedule of Net Periodic Pension Costs (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Apr. 01, 2012
Defined Benefit Pension Plans
    
Defined Benefit Plan Disclosure    
Service cost $ 834 $ 722
Interest cost 3,294 4,083
Expected return on plan assets (3,630) (4,087)
Amortization of unrecognized prior service benefit 41 58
Settlement loss 76  
Total net periodic pension cost 615 776
Post-Retirement Benefit Plans
    
Defined Benefit Plan Disclosure    
Service cost 16 19
Interest cost 87 110
Amortization of unrecognized prior service benefit (150) (150)
Total net periodic pension cost $ (47) $ (21)