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Financial Instruments and Derivatives - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Apr. 01, 2012	Dec. 31, 2012
Financial Instruments and Fair Value [Line Items]
Available-for-sale securities, realized gain	$ 300,000	$ 300,000
Fair market value of investments with unrealized losses	43,357,000		59,100,000
Available-for-sale marketable securities, fair Market Value of Investments with Unrealized Losses greater than one year	300,000
Available-for-sale marketable securities, fair Market Value of Investments with Unrealized Losses less than one year	43,100,000
Notional amount of foreign exchange contracts hedging monetary assets and liabilities	$ 69,000,000		$ 64,100,000

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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

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Aggregate notional amount of all foreign currency derivatives designated as hedging instruments in fair value hedges. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

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