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Segment Reporting - Additional Information (Detail) - USD ($) $ in Thousands | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Nov. 01, 2017 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Goodwill | $ 68,845 | $ 69,685 |  |
Automotive Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Goodwill | 38,072 |  |  | $ 22,724
Industrial Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Goodwill | $ 30,773 |  |  | $ 30,773
Etratech Inc. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Date of acquisition | Nov. 01, 2017 |  |  |
Goodwill |  |  | $ 14,881 |

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