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Maturities of Marketable Securities Available-for-Sale (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Amortized cost
Mature in one year or less	$ 79,743
Mature after one year through two years	37,743
Total amortized cost	117,486
Estimated Fair Value
Mature in one year or less	79,772
Mature after one year through two years	37,759
Total estimated fair value	$ 117,531

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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