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Cash and Cash Equivalents and Investments - Schedule of Available-for-Sale Investments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Original stated term to maturity of available-for-sale- investments, Less than one year	$ 63,876	$ 160,607
Original stated term to maturity of available-for-sale- investments, One to five years
Original stated term to maturity of available-for-sale- investments, Five to ten years
Original stated term to maturity of available-for-sale- investments, Greater than ten years	7,382	10,415
Original stated term to maturity of available-for-sale- investments, Total	$ 71,258	$ 171,022

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- Definition

Amount of available-for-sale debt securities at fair value maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year.

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Amount of available-for-sale debt securities at fair value maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year.

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