Goodwill and Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Finite Lived Intangible Assets [Line Items]
Cost	$ 29,389	$ 27,496
Accumulated Amortization	27,662	27,496
Net Book Value	1,727	0
Customer Contracts and Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Cost	17,632	16,880
Accumulated Amortization	16,943	16,880
Net Book Value	689	0
Patents and Technology [Member]
Finite Lived Intangible Assets [Line Items]
Cost	10,062	9,644
Accumulated Amortization	9,678	9,644
Net Book Value	384	0
Trademarks and Trade Names [Member]
Finite Lived Intangible Assets [Line Items]
Cost	1,581	972
Accumulated Amortization	1,023	972
Net Book Value	558	0
Other Intangible Assets [Member]
Finite Lived Intangible Assets [Line Items]
Cost	114	0
Accumulated Amortization	18	0
Net Book Value	$ 96	$ 0