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Income Taxes (Narrative) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 21, 2017
Income Taxes [Abstract]          
Effective tax rate, Statutory federal tax     21.00%   35.00%
Income tax expense $ 4,047 $ 3,685 $ 10,242 $ 10,115