Etratech Acquisition - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Value	$ 160,908	$ 137,583
Accumulated Amortization	77,622	81,198
Total other intangible assets Net	83,286	56,385
Customer relationships
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Value	101,213	87,316
Technology
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Value	47,641	$ 39,167
Etratech Inc.
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Value	33,362
Accumulated Amortization	635
Total other intangible assets Net	32,727
Etratech Inc. | Customer relationships
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Value	24,774
Accumulated Amortization	358
Total other intangible assets Net	$ 24,416
Etratech Inc. | Customer relationships | Minimum
Finite And Indefinite Lived Intangible Assets [Line Items]
Useful Life	8 years
Etratech Inc. | Customer relationships | Maximum
Finite And Indefinite Lived Intangible Assets [Line Items]
Useful Life	12 years
Etratech Inc. | Technology
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Value	$ 8,588
Accumulated Amortization	277
Total other intangible assets Net	$ 8,311
Etratech Inc. | Technology | Minimum
Finite And Indefinite Lived Intangible Assets [Line Items]
Useful Life	5 years
Etratech Inc. | Technology | Maximum
Finite And Indefinite Lived Intangible Assets [Line Items]
Useful Life	6 years