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Effective Tax Rates Calculation (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Disclosure [Abstract] |  |  |
Provision for income taxes | $ 395,203 | $ 324,671 | $ 315,309
Income before income taxes | $ 1,145,901 | $ 929,667 | $ 869,332
Effective tax rate | 34.50% | 34.90% | 36.30%

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