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Etratech Acquisition - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Net Value | $ 60,202 | $ 83,286
Etratech Inc. |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Value | 32,898 |
Accumulated Amortization | 3,410 |
Net Value | 29,488 |
Etratech Inc. | Customer relationships |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Value | 24,424 |
Accumulated Amortization | 1,909 |
Net Value | $ 22,515 |
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 | $ 8,474 |
Accumulated Amortization | 1,501 |
Net Value | $ 6,973 |
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 |

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