Components of Net Periodic Benefit Cost (Income) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3,761	$ 3,131	$ 11,283	$ 9,392
Interest cost	8,087	8,225	24,261	24,675
Expected return on plan assets	(7,844)	(7,963)	(23,532)	(23,890)
Recognized net actuarial loss (gains)	2,577	971	7,731	2,914
Net periodic benefit cost (income)	6,581	4,364	19,743	13,091
Post-retirement
Defined Benefit Plan Disclosure [Line Items]
Service cost	55	45	165	135
Interest cost	422	472	1,266	1,416
Amortization of prior year service benefit	(6)	(7)	(18)	(21)
Recognized net actuarial loss (gains)	(602)	(826)	(1,806)	(2,479)
Net periodic benefit cost (income)	$ (131)	$ (316)	$ (393)	$ (949)