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Restructuring and Impairment Charges (Additional Information) (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 24, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Accrued capital additions |  |  |  | $ 2,744 | $ 2,376 | $ 1,081
Impairment charges |  |  |  | 1,506 | 807 | 0
Isola asset acquisition |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Impairment charges |  |  |  | 1,500 |  |
Brightvolt, Inc. |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Impairment charges |  |  | $ 300 |  |  |
ROLINX |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Impairment charges |  | $ 500 |  |  |  |
Relocation |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  | 600 | 2,800 | 700
Other Restructuring |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  | 100 | $ 400 | $ 600
Severance and other related costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  | 186 |  |
Fair value of restructuring charges |  |  |  | 1,100 |  |
Facility Closing |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges | $ 2,000 |  |  | 546 |  |
Severance costs | $ 500 |  |  |  |  |
Accrued capital additions |  |  |  | $ 1,600 |  |

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