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Income Taxes - Components of Income Tax Expense (Benefit) (Parenthetical) (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Tax Disclosure [Abstract]        
Deferred Federal AMT expense (benefit) $ (16,000) $ (79,000) $ (35,000) $ (141,000)