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Etratech Acquisition - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Value | $ 160,908 | $ 111,522
Accumulated Amortization | 77,622 | 53,965
Total other intangible assets Net | 83,286 | 57,557
Customer relationships |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Value | 101,213 | 66,542
Technology |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Value | 47,641 | $ 35,378
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] |  |
Estimated useful life of intangible assets | 8 years |
Etratech Inc. | Customer relationships | Maximum |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Estimated useful life of intangible assets | 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] |  |
Estimated useful life of intangible assets | 5 years |
Etratech Inc. | Technology | Maximum |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Estimated useful life of intangible assets | 6 years |

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