|
Fair Value Measurements (Assets Measured At Fair Value) (Detail) (USD $)
In Thousands, unless otherwise specified
|
Mar. 31, 2013
|
Dec. 31, 2012
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Short-term investments |
$ 22,002 |
$ 29,182 |
|
U.S. Government And Agency Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Short-term investments |
2,387 |
3,510 |
|
Corporate Obligations [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Short-term investments |
16,674 |
15,303 |
|
Other Fixed Income Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Short-term investments |
476 |
588 |
|
International Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Short-term investments |
2,465 |
9,781 |
|
Significant Other Observable Inputs (Level 2) [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Short-term investments |
22,002 |
29,182 |
|
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 |
2,387 |
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 |
16,674 |
15,303 |
|
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 |
476 |
588 |
|
Significant Other Observable Inputs (Level 2) [Member] | International Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Short-term investments |
$ 2,465 |
$ 9,781 |