Income Taxes - Significant Components of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Reserves and other liabilities	$ 916	$ 3,220
Tax loss carryforwards	313	661
Acquisition costs and intangibles	531	498
Equity investment	883	1,503
Deferred Compensation	760	877
Inventory	536	1,432
State depreciation	201	95
Other	141	83
Less valuation allowance	(507)	(693)
Deferred tax assets, net of valuation allowance	3,774	7,676
Deferred tax liabilities:
Prepaids	402	543
Acquisition costs and intangibles	2,214	1,074
Depreciation, amortization and other	15,909	24,012
Unrealized gains on hedges	355	788
Total deferred tax liabilities	18,880	26,417
Net deferred tax liability	$ 15,106	$ 18,741