Annual report pursuant to Section 13 and 15(d)

Income Taxes - Variations from Federal Statutory Rate (Parenthetical) (Detail)

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Income Taxes - Variations from Federal Statutory Rate (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Expected federal income tax expense (benefit), statutory rate 21.00% 21.00%