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Variations From Federal Statutory Rate (Parenthetical) (Detail)
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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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| Reconciliation Of Income Taxes [Line Items] | |||
| Expected federal income tax expense (benefit), statutory rate | 34.00% | 34.00% | 34.00% |