The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.

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Income Taxes - Reconciliation of Statutory and Effective Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule Of Effective Income Tax Rate Reconciliation [Line Items]
Provision computed at statutory rate									$ 57,461	$ 62,905	$ 51,714
State income tax, net of Federal tax benefit									1,353	1,432	1,884
Asset impairment charge									3,190	0	0
Tax-exempt interest income									(8,118)	(334)	(554)
Acquisition related items									322	0	(315)
Domestic manufacturing deduction									(105)	(212)	(70)
Research and experimental credit									0	(508)	(713)
Foreign rate differential									(13,710)	(13,899)	(8,134)
Other									1,884	(8)	1,181
Provision for income taxes	$ 9,263	$ 11,917	$ 9,366	$ 11,731	$ 8,253	$ 13,795	$ 13,082	$ 14,246	$ 42,277	$ 49,376	$ 44,993