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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 6 Months Ended
Jun. 29, 2014
Jun. 30, 2013
Jun. 29, 2014
Jun. 30, 2013
Pension Obligations [Member]
        
Components of net periodic benefit cost:        
Service cost $ 2,072 $ 1,676 $ 4,091 $ 3,364
Interest cost 4,121 2,914 8,202 5,862
Expected return on plan assets (5,134) (3,391) (10,251) (6,797)
Amortization of prior service cost (credit)   (8) 1 (16)
Actuarial losses 1,723 1,665 3,446 3,333
Net periodic benefit cost 2,782 2,856 5,489 5,746
Other Postretirement Obligations [Member]
        
Components of net periodic benefit cost:        
Service cost 30 35 60 68
Interest cost 525 557 1,077 1,083
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) (27) (28) (53) (55)
Actuarial losses 164 320 353 598
Net periodic benefit cost $ 692 $ 884 $ 1,437 $ 1,694