Income Taxes - Components of Net Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Foreign tax credit carryforward	$ 2,918	$ 3,094
Inventory	28,181	20,816
Net operating losses	4,899	5,380
Allowance for doubtful accounts	1,729	1,200
Reserve for accrued liabilities	3,357	3,177
Stock options	3,908	3,553
Other	1,003	1,811
Total deferred tax assets	45,995	39,031
Valuation allowance	(31,833)	(29,539)
Deferred tax liabilities:
Property, plant and equipment	(6,601)	(2,618)
Goodwill & Intangibles	(881)	(4,161)
Other	(1,151)	(781)
Total deferred tax	(8,633)	(7,560)
Net deferred tax asset	$ 5,529	$ 1,932