Goodwill and Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Finite Lived Intangible Assets [Line Items]
Cost	$ 29,437	$ 27,496
Accumulated Amortization	27,564	27,496
Net Book Value	1,873	0
Customer Contracts and Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Cost	17,651	16,880
Accumulated Amortization	16,906	16,880
Net Book Value	745	0
Patents and Technology [Member]
Finite Lived Intangible Assets [Line Items]
Cost	10,072	9,644
Accumulated Amortization	9,658	9,644
Net Book Value	414	0
Trademarks and Trade Names [Member]
Finite Lived Intangible Assets [Line Items]
Cost	1,597	972
Accumulated Amortization	993	972
Net Book Value	604	0
Other Intangible Assets [Member]
Finite Lived Intangible Assets [Line Items]
Cost	117	0
Accumulated Amortization	7	0
Net Book Value	$ 110	$ 0