Pensions and Other Post-employment Benefits - Components of Net Periodic Benefit Cost (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Pension Benefits [Member]
Components of net periodic benefit cost
Service cost	$ 2,356	$ 1,966	$ 7,066	$ 5,900
Interest cost	2,353	2,341	7,060	7,013
Expected return on plan assets	(2,996)	(2,926)	(8,989)	(8,778)
Amortization of prior service cost (benefit)	(85)	(118)	(255)	(354)
Amortization of net loss	1,951	1,402	5,816	4,206
Net periodic benefit cost	3,579	2,665	10,698	7,987
Other Benefits [Member]
Components of net periodic benefit cost
Service cost	76	93	229	279
Interest cost	311	360	932	1,080
Amortization of prior service cost (benefit)	29	0	86	0
Net periodic benefit cost	$ 416	$ 453	$ 1,247	$ 1,359