Financial Instruments and Derivatives - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012	Dec. 31, 2012
Financial Instruments and Fair Value [Line Items]
Available-for-sale securities, realized gain	$ 200,000	$ 300,000	$ 500,000	$ 900,000
Final payment for Level 3 contingent consideration			400,000
Fair market value of investments with unrealized losses	150,973,000		150,973,000		59,100,000
Available-for-sale marketable securities, fair market value of investments with unrealized losses greater than one year	500,000		500,000
Available-for-sale marketable securities, fair market value of investments with unrealized losses less than one year	150,500,000		150,500,000
Gain (loss) on foreign currency transactions	(400,000)	1,200,000	(5,000,000)	800,000
Foreign Exchange Contract
Financial Instruments and Fair Value [Line Items]
Notional amount of foreign exchange contracts hedging monetary assets and liabilities	$ 64,100,000		$ 64,100,000		$ 64,100,000