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Income Taxes - Components of Pre-tax Income and Provision for Income Taxes (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
U.S. federal statutory income tax rate | 21.00% | 35.00% | 35.00%

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