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Income Taxes - Components of Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 4,522	$ 1,789
State	262	164
Total current	4,784	1,953
Deferred:
Federal	(13,226)	117
State	689	30
Total deferred	(12,537)	147
Total income tax provision (benefit)	$ (7,753)	$ 2,100

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Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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