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Financial Instruments - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Financial Instruments [Line Items] |  |  |  |
Period cash equivalents and short-term investments have been in continuous unrealized loss position, years, maximum |  |  | 1 year |
Period cash equivalents and long-term investments have been in continuous unrealized loss position, years, minimum |  |  | 1 year |
Cumulative unrealized income (loss) on municipal bonds | $ (36,000) | $ 206,000 | $ (41,000) | $ 326,000
Revolving credit facility maturity date |  |  | Jan. 31, 2014 |
Repayment of amount borrowed | 0 |  | 0 |
Municipal bond [Member] |  |  |  |
Financial Instruments [Line Items] |  |  |  |
Period debt obligations mature, years, maximum |  |  | 1 year |
Cumulative unrealized income (loss) on municipal bonds |  |  | $ 500,000 |

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- Details
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- Definition Long Term Investment Continuous Unrealized Loss Position Period + References No definition available. + Details
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- Definition Short Term Investment Continuous Unrealized Loss Position Period + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 + Details
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