Revenue - Timing of Transfer (Details) - USD ($) $ in Thousands	3 Months Ended
	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