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Discontinued Operations - Net Sales and Losses from Discontinued Operations (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 04, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Income (loss) from discontinued operations before income taxes |  | $ 72 | $ (13,478) | $ 72 | $ (23,565)
Income tax benefit from discontinued operations |  | 0 | 3,730 | 0 | 5,509
Income (loss) from discontinued operations |  | 72 | (9,748) | 72 | (18,056)
Test and Inspection Services |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Income (loss) from discontinued operations | $ (10,034) |  |  |  |
Test and Inspection Services | Discontinued Operations, Disposed of by Sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Net sales |  | 0 | 2,520 | 0 | 13,590
Income (loss) from discontinued operations before income taxes |  | 72 | (306) | 72 | (10,393)
Income tax benefit from discontinued operations |  | 0 | 592 | 0 | 2,371
Loss on the sale of discontinued operations |  | 0 | (13,172) | 0 | (13,172)
Income tax benefit on the sale of discontinued operations |  | 0 | 3,138 | 0 | 3,138
Income (loss) from discontinued operations |  | $ 72 | $ (9,748) | $ 72 | $ (18,056)

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