Goodwill and Other Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Intangible Assets [Line Items]
Gross Carrying Value	$ 248,242	$ 158,236
Gross Carrying Value	248,942	158,936
Accumulated Amortization	(32,653)	(23,498)
Accumulated Amortization	(32,653)	(23,498)
Net Carrying Value	215,589	134,738
Net Carrying Value	$ 216,289	$ 135,438
Weighted Average Useful Life (in years)	16 years	16 years
Trademark
Intangible Assets [Line Items]
Gross Carrying Value	$ 700	$ 700
Net Carrying Value	700	700
Technology—developed
Intangible Assets [Line Items]
Gross Carrying Value	82,088	53,315
Accumulated Amortization	(8,533)	(5,942)
Net Carrying Value	$ 73,555	$ 47,373
Weighted Average Useful Life (in years)	19 years	19 years
Patents
Intangible Assets [Line Items]
Gross Carrying Value	$ 240	$ 240
Accumulated Amortization	$ (240)	$ (240)
Weighted Average Useful Life (in years)	8 years	8 years
Customer relationships
Intangible Assets [Line Items]
Gross Carrying Value	$ 160,467	$ 101,460
Accumulated Amortization	(22,769)	(16,609)
Net Carrying Value	$ 137,698	$ 84,851
Weighted Average Useful Life (in years)	15 years	14 years
Trademark
Intangible Assets [Line Items]
Gross Carrying Value	$ 3,751	$ 2,160
Accumulated Amortization	(286)	(159)
Net Carrying Value	$ 3,465	$ 2,001
Weighted Average Useful Life (in years)	20 years	20 years
Other intangibles
Intangible Assets [Line Items]
Gross Carrying Value	$ 1,696	$ 1,061
Accumulated Amortization	(825)	(548)
Net Carrying Value	$ 871	$ 513
Weighted Average Useful Life (in years)	3 years	3 years