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Fair Value - Additional Information (Detail) (USD $)
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3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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| Fair Value Disclosures [Abstract] | ||||
| Transfers out of Level 2 to Level 1, Assets | $ 0 | $ 0 | $ 24,000,000 | $ 0 |
| Transfers out of Level 1 to Level 2, Assets | $ 0 | $ 0 | $ 1,000,000 | $ 0 |