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Cash Equivalents and Investments - Company's Cash Equivalents and Investments Measured at Fair Value (Detail) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Cash equivalents measured at fair value	$ 336,974	$ 371,075
Investments measured at fair value	233,305	204,457
Money-market funds [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Cash equivalents measured at fair value	325,927	364,596
Government and agency securities [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Cash equivalents measured at fair value	8,547	6,479
Investments measured at fair value	73,035	66,700
Commercial paper [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Cash equivalents measured at fair value	2,500
Investments measured at fair value	3,998	900
Agency securities [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	145,150	129,463
Non-agency securities [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	1,116	1,393
Corporate debt securities [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	10,006	6,001
Long-term investments in equity securities [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	1,952	1,689
Level 1 [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Cash equivalents measured at fair value	325,927	364,596
Investments measured at fair value	15,003	17,042
Level 1 [Member] \| Money-market funds [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Cash equivalents measured at fair value	325,927	364,596
Level 1 [Member] \| Government and agency securities [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	15,003	17,042
Level 1 [Member] \| Long-term investments in equity securities [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	1,952	1,689
Level 2 [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Cash equivalents measured at fair value	11,047	6,479
Investments measured at fair value	218,302	187,415
Level 2 [Member] \| Government and agency securities [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Cash equivalents measured at fair value	8,547	6,479
Investments measured at fair value	58,032	49,658
Level 2 [Member] \| Commercial paper [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Cash equivalents measured at fair value	2,500
Investments measured at fair value	3,998	900
Level 2 [Member] \| Agency securities [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	145,150	129,463
Level 2 [Member] \| Non-agency securities [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	1,116	1,393
Level 2 [Member] \| Corporate debt securities [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	$ 10,006	$ 6,001

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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