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Income Taxes - Accumulated Other Comprehensive Income/(Loss) (Net of Tax) (Parenthetical) (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Before Income Taxes And Income Tax Expense Benefit [Line Items]      
Income before income taxes includes goodwill impairment tax effect $ 0 $ 0 $ 0