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Income Taxes - Components of Earnings Before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Domestic $ 511,025 $ 390,874 $ (404,910)
International 437,580 322,754 741,172
Earnings before income taxes $ 948,605 $ 713,628 $ 336,262