Business Segments - Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information
Total net sales	$ 130,015	$ 130,053	$ 360,324	$ 400,655
Operating (loss) profit	(1,120)	758	(927)	5,021
Operating Segments
Segment Reporting Information
Total net sales	130,015	130,053	360,324	400,655
Operating (loss) profit	2,087	3,208	4,822	12,005
Rail, Technologies, and Services
Segment Reporting Information
Total net sales	77,350	73,942	222,857	228,956
Rail, Technologies, and Services | Operating Segments
Segment Reporting Information
Total net sales	77,350	73,942	222,857	228,956
Operating (loss) profit	539	3,091	5,576	10,970
Precast Concrete Products
Segment Reporting Information
Total net sales	28,856	17,972	67,477	50,723
Precast Concrete Products | Operating Segments
Segment Reporting Information
Total net sales	28,856	17,972	67,477	50,723
Operating (loss) profit	1,245	144	329	1,175
Steel Products and Measurement
Segment Reporting Information
Total net sales	23,809	38,139	69,990	120,976
Steel Products and Measurement | Operating Segments
Segment Reporting Information
Total net sales	23,809	38,139	69,990	120,976
Operating (loss) profit	$ 303	$ (27)	$ (1,083)	$ (140)