Goodwill and Intangible Assets - Components of Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Acquired Finite Lived Intangible Assets [Line Items]
Finite lived intangible assets, Cost	$ 111,376	$ 111,198
Finite lived intangible assets, Accumulated amortization	(31,345)	(28,653)
Finite lived intangible assets, Net	80,031	82,545
Customer Lists [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Finite lived intangible assets, Cost	91,757	91,757
Finite lived intangible assets, Accumulated amortization	(22,214)	(20,026)
Finite lived intangible assets, Net	$ 69,543	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)	14 years
Patents and Technology [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Finite lived intangible assets, Cost	$ 16,734	16,556
Finite lived intangible assets, Accumulated amortization	(6,428)	(5,990)
Finite lived intangible assets, Net	$ 10,306	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	$ 2,885	2,885
Finite lived intangible assets, Accumulated amortization	(2,703)	(2,637)
Finite lived intangible assets, Net	$ 182	$ 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