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Acquisitions and Divestitures - Schedule of Business Acquisition, Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Business Acquisition [Line Items] |  |
Diluted (loss) earnings per share, As reported (usd per share) | $ 0.13 | $ (4.25)
VanHooseCo |  |
Business Acquisition [Line Items] |  |
Net sales | $ 522,997 |
Net (loss) income attributable to L.B. Foster Company | $ (44,564) |
Diluted (loss) earnings per share, As reported (usd per share) | $ (4.25) |
Diluted (loss) earnings per share, Pro forma (usd per share) | $ (4.16) |

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