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Available-for-Sale Securities Measured at Fair Value (Detail) (USD $)
In Thousands

Sep. 30, 2011

Dec. 31, 2010

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities

$ 200,946

$ 285,205

Mutual funds

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities

1,831

^[1]

2,007

Mutual funds | Level 2

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities

1,831

^[1]

2,007

Commercial paper

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities

158,924

Commercial paper | Level 2

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities

158,924

U.S. Government and agency securities

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities

25,900

^[2]

269,161

U.S. Government and agency securities | Level 1

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities

25,900

^[2]

269,161

Asset-backed securities and collateralized mortgage obligations

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities

14,291

^[3]

9,869

Asset-backed securities and collateralized mortgage obligations | Level 2

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities

7,888

^[3]

2,497

Asset-backed securities and collateralized mortgage obligations | Level 3

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities

6,403

^[3]

7,372

Corporate notes and bonds

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities

4,168

Corporate notes and bonds | Level 2

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities

4,168

Level 1

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities

25,900

269,161

Level 2

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities

168,643

8,672

Level 3

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities

$ 6,403

$ 7,372

[1]	Various U.S. equities and other investments managed under mutual funds.
[2]	Investments in U.S. Treasury securities with maturities of two years or less.
[3]	Asset-backed and mortgage-backed securities with maturities of up to 26 years.

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 represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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