Goodwill and Other Intangible Assets - Components of Other Intangible Assets and Changes in Gross Carrying Values (Detail) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Other Finite-Lived Intangible Assets, Gross Carrying Value		$ 31,897	$ 34,156
Other Finite-Lived Intangible Assets, Accumulated Amortization		17,653	15,618
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Other Finite-Lived Intangible Assets, Gross Carrying Value		6,947	6,947
Other Finite-Lived Intangible Assets, Accumulated Amortization		4,492	3,893
Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Other Finite-Lived Intangible Assets, Gross Carrying Value		387	453
Other Finite-Lived Intangible Assets, Accumulated Amortization		173	113
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Other Finite-Lived Intangible Assets, Gross Carrying Value		3,800	4,087
Other Finite-Lived Intangible Assets, Accumulated Amortization		1,929	1,870
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Other Finite-Lived Intangible Assets, Gross Carrying Value		10,750	12,150
Other Finite-Lived Intangible Assets, Accumulated Amortization		4,356	4,299
Know-how [Member]
Finite-Lived Intangible Assets [Line Items]
Other Finite-Lived Intangible Assets, Gross Carrying Value	[1]	7,900	8,043
Other Finite-Lived Intangible Assets, Accumulated Amortization	[1]	5,514	4,669
Supply Contract [Member]
Finite-Lived Intangible Assets [Line Items]
Other Finite-Lived Intangible Assets, Gross Carrying Value		2,113	2,476
Other Finite-Lived Intangible Assets, Accumulated Amortization		$ 1,189	$ 774

[1] Know-how includes intellectual property rights covering proprietary information, written formulae, trade secrets or secret processes, inventions and developmental products (whether patentable or not), discoveries, improvements, compositions, manufacturing processes, manuals, specifications and technical data