Financial Instruments and Derivatives - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended			1 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011	Dec. 31, 2011	Oct. 31, 2012 Contingent Consideration
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Contingent consideration paid						$ 14,400,000
Proceeds from sales of available-for-sale marketable securities			70,937,000	627,439,000
Net gain (loss) from sales of marketable securities	300,000	2,200,000	900,000	2,200,000
Fair market value of investments with unrealized losses	11,430,000		11,430,000		64,571,000
Fair market value of investments with unrealized losses greater than one year					2,400,000
Fair market value of investments with unrealized losses less than one year					62,200,000
Notional amount of foreign exchange contracts hedging monetary assets and liabilities	$ 84,500,000		$ 84,500,000		$ 85,400,000