Goodwill and Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Cost	$ 34,334	$ 34,334
Accumulated Amortization	34,334	34,190
Net Book Value	0	144
Customer Contracts and Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Cost	16,880	16,880
Accumulated Amortization	16,880	16,880
Net Book Value	0	0
Patents and Technology [Member]
Finite Lived Intangible Assets [Line Items]
Cost	10,114	10,114
Accumulated Amortization	10,114	10,003
Net Book Value	0	111
Trademarks and Trade Names [Member]
Finite Lived Intangible Assets [Line Items]
Cost	4,834	4,834
Accumulated Amortization	4,834	4,801
Net Book Value	0	33
Other [Member]
Finite Lived Intangible Assets [Line Items]
Cost	2,506	2,506
Accumulated Amortization	2,506	2,506
Net Book Value	$ 0	$ 0