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