Pensions and Other Post-employment Benefits - Components of Net Periodic Benefit Cost (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2013	Jun. 29, 2012	Jun. 28, 2013	Jun. 29, 2012
Pension Benefits [Member]
Components of net periodic benefit cost
Service cost	$ 2,356	$ 1,966	$ 4,711	$ 3,934
Interest cost	2,353	2,341	4,707	4,672
Expected return on plan assets	(2,996)	(2,926)	(5,992)	(5,852)
Amortization of prior service cost (benefit)	(86)	(118)	(170)	(236)
Amortization of net loss	1,933	1,402	3,865	2,804
Net periodic benefit cost	3,560	2,665	7,121	5,322
Other Benefits [Member]
Components of net periodic benefit cost
Service cost	76	93	152	186
Interest cost	311	360	622	720
Amortization of prior service cost (benefit)	29	0	58	0
Net periodic benefit cost	$ 416	$ 453	$ 832	$ 906