Goodwill and Intangible Assets - Components of Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Acquired Finite Lived Intangible Assets [Line Items]
Finite lived intangible assets, Cost	$ 139,784	$ 139,784
Finite lived intangible assets, Accumulated amortization	(76,056)	(66,504)
Finite lived intangible assets, Net	63,728	73,280
Customer Lists [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Finite lived intangible assets, Cost	113,357	113,357
Finite lived intangible assets, Accumulated amortization	(58,326)	(50,457)
Finite lived intangible assets, Net	$ 55,031	62,900
Customer Lists [Member] | Minimum [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Useful life (years)	5 years
Customer Lists [Member] | Maximum [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Useful life (years)	15 years
Patents and Technology [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Finite lived intangible assets, Cost	$ 23,424	23,424
Finite lived intangible assets, Accumulated amortization	(14,727)	(13,044)
Finite lived intangible assets, Net	$ 8,697	10,380
Patents and Technology [Member] | Minimum [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Useful life (years)	3 years
Patents and Technology [Member] | Maximum [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Useful life (years)	10 years
Trade Names and Trademarks [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Finite lived intangible assets, Cost	$ 3,003	3,003
Finite lived intangible assets, Accumulated amortization	$ (3,003)	$ (3,003)
Trade Names and Trademarks [Member] | Minimum [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Useful life (years)	1 year
Trade Names and Trademarks [Member] | Maximum [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Useful life (years)	2 years