Goodwill and Intangible Assets - Components of Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Acquired Finite Lived Intangible Assets [Line Items]
Finite lived intangible assets, Cost	$ 135,922	$ 111,198
Finite lived intangible assets, Accumulated amortization	(34,034)	(28,653)
Finite lived intangible assets, Net	101,888	82,545
Customer Lists [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Finite lived intangible assets, Cost	110,257	91,757
Finite lived intangible assets, Accumulated amortization	(24,403)	(20,026)
Finite lived intangible assets, Net	$ 85,854	71,731
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)	20 years
Patents and Technology [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Finite lived intangible assets, Cost	$ 22,781	16,556
Finite lived intangible assets, Accumulated amortization	(6,875)	(5,990)
Finite lived intangible assets, Net	$ 15,906	10,566
Patents and Technology [Member] | Minimum [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Useful life (years)	5 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	$ 2,884	2,885
Finite lived intangible assets, Accumulated amortization	(2,756)	(2,637)
Finite lived intangible assets, Net	$ 128	$ 248
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