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Cash Equivalents and Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 01, 2012	Mar. 31, 2013	Dec. 31, 2012
Investments Debt And Equity Securities [Abstract]
Carrying value of company's non-marketable securities		$ 42.8	$ 42.1
Gain recognized from re-measurement of pre-acquisition equity interest to estimated fair value	$ 5.8
Number of investments in an unrealized loss position		107

Disclosure regarding factors used to determine that the impairment of securities not categorized as either held-to-maturity securities or trading securities (hence equal to available for sale securities) where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the available-for-sale investments determined to be temporarily impaired.

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