Investment in Joint Venture - Summarized Income Statement Information of Unconsolidated Joint Venture (Detail) - Joint Venture - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Net sales	$ 69,901	$ 74,805	$ 65,756
Cost of sales	57,596	57,514	44,530
Income from operations	6,853	13,659	16,268
Net income	$ 4,646	$ 11,442	$ 13,702