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Fair Value Measurements - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
Sep. 30, 2013
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Dec. 31, 2012
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Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Assets recorded at fair value | $ 0 | $ 0 |
| Liabilities recorded at fair value | 0 | 0 |
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Significant Unobservable Inputs (Level 3) [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Assets recorded at fair value | 0 | 0 |
| Liabilities recorded at fair value | $ 0 | $ 0 |
| X | ||||||||||
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- Definition
Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Fair value of financial and nonfinancial obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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