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Income Taxes (Narrative) (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 21, 2017
Income Taxes [Abstract]      
Effective tax rate, Statutory federal tax 21.00%   35.00%
Income Tax Expense (Benefit) $ 2,709 $ 2,566  
Effective tax rate, Share-based compensation 1.45%