Accumulated Other Comprehensive Loss, Net of Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated net foreign currency translation adjustments, Beginning Balance			$ 42,138
Accumulated net unrealized (loss)/gain on investments, Beginning Balance			5,942
Accumulated net unrealized (loss)/gain on derivatives, Beginning Balance			(2,551)
Accumulated actuarial loss on pension and post-retirement plans, Beginning Balance			(578,757)
Total accumulated other comprehensive income, Beginning Balance			(533,228)
Accumulated net foreign currency translation adjustments, Other Comprehensive Income			178
Accumulated net unrealized (loss)/gain on investments, Other Comprehensive Income			184
Accumulated net unrealized (loss)/gain on derivatives, Other Comprehensive Income			2,420
Accumulated actuarial loss on pension and post-retirement plans, Other Comprehensive Income			12,267
Other comprehensive income/(loss), net of tax	9,804	(6,174)	15,049	(1,064)
Accumulated net foreign currency translation adjustments, Ending Balance	42,316		42,316
Accumulated net unrealized (loss)/gain on investments, Ending Balance	6,126		6,126
Accumulated net unrealized (loss)/gain on derivatives, Ending Balance	(131)		(131)
Accumulated actuarial loss on pension and post-retirement plans, Ending Balance	(566,490)		(566,490)
Total accumulated other comprehensive income, Ending Balance	$ (518,179)		$ (518,179)