Goodwill and Intangible Assets - Summary of Company's Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Finite Lived Intangible Assets [Line Items]
Cost	$ 143,524	$ 109,246
Accumulated amortization	(23,727)	(13,892)
Net carrying amount	119,797	95,354
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Cost	132,094	102,696
Accumulated amortization	(16,570)	(7,369)
Net carrying amount	115,524	95,327
Technology and Other Intangibles [Member]
Finite Lived Intangible Assets [Line Items]
Cost	11,430	6,550
Accumulated amortization	(7,157)	(6,523)
Net carrying amount	$ 4,273	$ 27