Pensions and Other Post-employment Benefits - Components of Net Periodic Benefit Cost (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2013	Mar. 30, 2012
Pension Benefits [Member]
Components of net periodic benefit cost
Service cost	$ 2,356	$ 1,966
Interest cost	2,353	2,341
Expected return on plan assets	(2,996)	(2,926)
Amortization of prior service cost (benefit)	(86)	(118)
Amortization of net loss	1,933	1,402
Net periodic benefit cost	3,560	2,665
Other Benefits [Member]
Components of net periodic benefit cost
Service cost	76	93
Interest cost	311	360
Amortization of prior service cost (benefit)	29	0
Net periodic benefit cost	$ 416	$ 453