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Revenue - Timing of Transfer (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Disaggregation of Revenue |  |
Total net sales | $ 115,488 | $ 98,794
Point in time |  |
Disaggregation of Revenue |  |
Total net sales | 82,962 | 68,491
Over time |  |
Disaggregation of Revenue |  |
Total net sales | 32,526 | 30,303
Rail, Technologies, and Services |  |
Disaggregation of Revenue |  |
Total net sales | 64,384 | 63,710
Rail, Technologies, and Services | Point in time |  |
Disaggregation of Revenue |  |
Total net sales | 53,834 | 49,166
Rail, Technologies, and Services | Over time |  |
Disaggregation of Revenue |  |
Total net sales | 10,550 | 14,544
Precast Concrete Products |  |
Disaggregation of Revenue |  |
Total net sales | 24,288 | 15,010
Precast Concrete Products | Point in time |  |
Disaggregation of Revenue |  |
Total net sales | 13,402 | 4,263
Precast Concrete Products | Over time |  |
Disaggregation of Revenue |  |
Total net sales | 10,886 | 10,747
Steel Products and Measurement |  |
Disaggregation of Revenue |  |
Total net sales | 26,816 | 20,074
Steel Products and Measurement | Point in time |  |
Disaggregation of Revenue |  |
Total net sales | 15,726 | 15,062
Steel Products and Measurement | Over time |  |
Disaggregation of Revenue |  |
Total net sales | $ 11,090 | $ 5,012

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