- Definition

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.

+ References+ Details

Available-for-Sale Securities Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities	$ 18,936	$ 45,992
Mutual funds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities	2,058	2,023
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities	7,496	29,737
Asset-backed securities and collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities	8,381	8,477
Corporate notes and bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities	1,001	5,755
Level 1
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities
Level 1 \| Mutual funds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities
Level 1 \| Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities
Level 1 \| Asset-backed securities and collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities
Level 1 \| Corporate notes and bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities
Level 2
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities	12,779	39,649
Level 2 \| Mutual funds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities	2,058	2,023
Level 2 \| Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities	7,496	29,737
Level 2 \| Asset-backed securities and collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities	2,224	2,134
Level 2 \| Corporate notes and bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities	1,001	5,755
Level 3
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities	6,157	6,343
Level 3 \| Mutual funds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities
Level 3 \| Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities
Level 3 \| Asset-backed securities and collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities	6,157	6,343
Level 3 \| Corporate notes and bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities