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Pay vs Performance Disclosure - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Pay vs Performance Disclosure        
Net income (loss) attributable to L.B. Foster Company $ 515 $ (2,077) $ 1,894 $ (1,633)