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Income Taxes - Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Income Tax Disclosure [Abstract] |  |
Current income tax expense | $ 14,029 | $ 15,709
Deferred income tax expense (benefit) | (1,933) | (2,118)
Income tax expense, as reported | $ 12,096 | $ 13,591
Effective tax rate | 16.50% | 19.80%

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