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Acquisitions and Divestitures - Schedule of Business Acquisition, Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Business Acquisition [Line Items] |  |  |  |
Diluted earnings per share (usd per share) | $ (0.20) | $ 0.22 | $ (0.16) | $ 0.37
VanHooseCo acquisition |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net sales |  |  | $ 385,824 |
Net loss attributable to L.B. Foster Company |  |  | $ (633) |
Diluted earnings per share, pro forma (usd per share) |  |  | $ (0.06) |

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