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Fair Value Measurements (Assets Measured At Fair Value) (Detail) (USD $)
In Thousands, unless otherwise specified

Sep. 30, 2013

Dec. 31, 2012

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Short-term investments

$ 25,804

$ 29,182

Mutual Funds [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Short-term investments

2,487

2,507

U.S. Government And Agency Securities [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Short-term investments

2,964

3,510

Corporate Obligations [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Short-term investments

14,131

12,796

Other Fixed Income Securities [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Short-term investments

441

588

International Securities [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Short-term investments

3,809

9,781

Municipal Obligations [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Short-term investments

1,972

Quoted Market Prices in Active Markets for Identical Assets (Level 1) [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Short-term investments

2,487

2,507

Quoted Market Prices in Active Markets for Identical Assets (Level 1) [Member] | Mutual Funds [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Short-term investments

2,487

2,507

Significant Other Observable Inputs (Level 2) [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Short-term investments

23,317

26,675

Significant Other Observable Inputs (Level 2) [Member] | U.S. Government And Agency Securities [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Short-term investments

2,964

3,510

Significant Other Observable Inputs (Level 2) [Member] | Corporate Obligations [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Short-term investments

14,131

^[1]

12,796

Significant Other Observable Inputs (Level 2) [Member] | Corporate Obligations [Member] | Line of Credit [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Short-term investments

4,500

^[1]

Significant Other Observable Inputs (Level 2) [Member] | Other Fixed Income Securities [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Short-term investments

441

588

Significant Other Observable Inputs (Level 2) [Member] | International Securities [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Short-term investments

3,809

9,781

Significant Other Observable Inputs (Level 2) [Member] | Municipal Obligations [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Short-term investments

$ 1,972

[1]

Included in this amount is a $4.5 million corporate obligation which has been used to collateralize the Company's line of credit with Bank of America, and is included in the line item "Restricted cash and investments," a component of current assets, on the consolidated balance sheets. See Note 5, Credit Facilities, for further details.

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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