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Provision for Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Expected tax expense, at the U.S. federal statutory income tax rate of 35% in 2017 and 21% in 2018			$ 3,525	$ 4,850
Domestic production activities deduction				(420)
State income taxes			576	400
Other, net			31	76
Total income tax expense	$ 1,286	$ 1,418	$ 4,132	$ 4,906

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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