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Income Taxes - Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Income Tax Disclosure [Abstract] |  |  |  |
Current income tax expense | $ 12,315 | $ 17,465 | $ 28,024 | $ 37,517
Deferred income tax expense (benefit) | 379 | (1,438) | (1,739) | (3,977)
Income tax expense, as reported | $ 12,694 | $ 16,027 | $ 26,285 | $ 33,540
Effective tax rate | 17.50% | 21.60% | 18.60% | 22.00%

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