Quarterly report pursuant to Section 13 or 15(d)

Components of Pension Cost (Detail)

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Components of Pension Cost (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost - benefits earned during the period $ 6,893 $ 5,811
Interest cost on projected benefit obligations 18,051 19,249
Expected return on plan assets (23,682) (20,156)
Amortization of deferred amounts, net deferred actuarial losses 21,362 17,618
Amortization of deferred amounts, deferred prior service cost 341 839
Net periodic pension cost $ 22,965 $ 23,361