Goodwill and Other Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Intangible Assets [Line Items]
Gross Carrying Value	$ 248,823	$ 158,236
Gross Carrying Value	249,523	158,936
Accumulated Amortization	(29,042)	(23,498)
Accumulated Amortization	(29,042)	(23,498)
Net Carrying Value	219,781	134,738
Net Carrying Value	$ 220,481	$ 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	82,202	53,315
Accumulated Amortization	(7,476)	(5,942)
Net Carrying Value	$ 74,726	$ 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	$ 160,931	$ 101,460
Accumulated Amortization	(20,382)	(16,609)
Net Carrying Value	$ 140,549	$ 84,851
Weighted Average Useful Life (in years)	15 years	14 years
Trademark
Intangible Assets [Line Items]
Gross Carrying Value	$ 3,730	$ 2,160
Accumulated Amortization	(222)	(159)
Net Carrying Value	$ 3,508	$ 2,001
Weighted Average Useful Life (in years)	20 years	20 years
Other intangibles
Intangible Assets [Line Items]
Gross Carrying Value	$ 1,720	$ 1,061
Accumulated Amortization	(722)	(548)
Net Carrying Value	$ 998	$ 513
Weighted Average Useful Life (in years)	3 years	3 years