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Pension and Other Postretirement Obligations - Components of Net Periodic Benefit Costs (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 30, 2014
Mar. 31, 2013
Pension Obligations [Member]
    
Components of net periodic benefit cost:    
Service cost $ 2,019 $ 1,687
Interest cost 4,081 2,949
Expected return on plan assets (5,116) (3,406)
Amortization of prior service credit    (8)
Actuarial losses 1,723 1,668
Net periodic benefit cost 2,707 2,890
Other Postretirement Obligations [Member]
    
Components of net periodic benefit cost:    
Service cost 31 34
Interest cost 551 526
Expected return on plan assets      
Amortization of prior service credit (26) (28)
Actuarial losses 189 278
Net periodic benefit cost $ 745 $ 810