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Reconciliation of Differences between Federal Statutory and Effective Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
At statutory rate	$ 6,551	$ 6,931	$ 3,192
Non-deductible interest expense		1,948	1,777
State taxes, net of US federal benefit	377	339	211
Federal tax deductions	(73)	(679)	(19)
Change in applicable tax rate	(8,468)
Costs associated with possible restructuring			(940)
Provision to return permanent difference	(767)	933	(68)
Refund Claims	(201)
Fuel Tax Credit	(166)
Other	(62)	(78)	(24)
Total income tax (benefit) expense	$ (2,809)	$ 9,394	$ 4,129

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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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