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Financial Instruments - Additional Information (Detail) (USD $)
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9 Months Ended | |
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Sep. 30, 2013
debt_security
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Dec. 31, 2012
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| Debt Instrument [Line Items] | ||
| Number of corporate debt securities | 11 | |
| Fair value of debt | $ 15,300,000 | |
| Available-for-sale Securities Gross Unrealized Loss Accumulated in Investments | 7,000 | 4,000 |
| Transfer of securities, Level 1 | 0 | |
| Transfer of securities, Level 2 | 0 | |
| Transfer of securities, Level 3 | $ 0 | |
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Minimum [Member]
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| Debt Instrument [Line Items] | ||
| Due date of company's long term available for sale securities | 1 year | |
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Maximum [Member]
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| Debt Instrument [Line Items] | ||
| Period of unrealized loss position | 12 months | |
| Due date of company's long term available for sale securities | 2 years |
| X | ||||||||||
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- Definition
Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale debt securities impacting investments. No definition available.
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- Definition
Available for sale securities noncurrent maturity period. No definition available.
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- Definition
Period of unrealized loss position. No definition available.
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- Definition
This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. No definition available.
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