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Income Tax - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Tax Credit Carryforward [Line Items] | |||
| Utilization of NOL and tax credit carryforwards due to ownership changes | 50.00% | ||
| Interest or penalties related to uncertain tax positions | $ 0 | $ 0 | $ 0 |
| Liabilities For Interest and Potential Penalties | 0 | 0 | |
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Federal net operating loss [Member]
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|||
| Tax Credit Carryforward [Line Items] | |||
| Net operating loss carryforward | 182 | ||
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State NOL [Member]
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| Tax Credit Carryforward [Line Items] | |||
| Net operating loss carryforward | $ 107 | ||