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Variations from Federal Statutory Rate (Parenthetical) (Detail)
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12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Reconciliation Of Income Taxes [Line Items] | |||
| Expected federal income tax expense (benefit), statutory rate Effective?Income?Tax?Rate?Reconciliation?At?Federal?Statutory?Income?Tax?Rate 34 34 34 | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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