Goodwill and Intangible Assets - Summary of Company's Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Cost	$ 70,876	$ 70,972
Accumulated amortization	(12,003)	(9,986)
Net carrying amount	58,873	60,986
Technology [Member]
Finite Lived Intangible Assets [Line Items]
Cost	5,770	5,770
Accumulated amortization	(5,770)	(5,770)
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Cost	64,326	64,332
Accumulated amortization	(5,481)	(3,451)
Net carrying amount	58,845	60,881
Non-Competition Agreements [Member]
Finite Lived Intangible Assets [Line Items]
Cost	380	380
Accumulated amortization	(380)	(380)
Tradenames [Member]
Finite Lived Intangible Assets [Line Items]
Cost	400	490
Accumulated amortization	(372)	(385)
Net carrying amount	$ 28	$ 105