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Business Segments - Narrative (Details) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 17, 2023 USD ($) | Jun. 30, 2023 USD ($) | Mar. 30, 2023 USD ($) | Dec. 31, 2024 USD ($) segment | Dec. 31, 2023 USD ($)
Segment Reporting Information |  |  |  |  |
Number of operating segments | segment |  |  |  | 2 |
Number of reportable segments | segment |  |  |  | 2 |
Proceeds from asset divestitures |  |  |  | $ 0 | $ 7,706
Gain (loss) on asset divestitures |  | $ (1,009) | $ (2,065) | 0 | (3,074)
Net sales |  |  |  | 530,765 | 543,744
Restructuring charges |  |  |  | 1,456 |
Gain on sale of former joint venture facility |  |  |  | 3,477 | 0
Accounts receivable, credit loss expense (reversal) |  |  |  | 700 |
Cost of Sales |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Restructuring charges |  |  |  | 245 |
Selling, General and Administrative Expenses |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Restructuring charges |  |  |  | 1,211 |
Accounts receivable, credit loss expense (reversal) |  |  |  | 365 | 1,912
Bridge Grid Deck Product | Sales |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Contract with customer, liability, cumulative catch-up adjustment to revenue, change in estimate of transaction price |  |  |  |  | 1,977
Bridge Grid Deck Product | Gross Profit |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Contract with customer, liability, cumulative catch-up adjustment to revenue, change in estimate of transaction price |  |  |  |  | 3,051
Infrastructure Solutions |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Net sales |  |  |  | 203,896 | 231,584
Rail, Technologies, and Services |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Net sales |  |  |  | 326,869 | 312,160
Operating Segments |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Net sales |  |  |  | 530,765 | 543,744
Operating Segments | Infrastructure Solutions |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Proceeds from asset divestitures |  |  |  | 1,300 |
Gain (loss) on asset divestitures |  |  |  | 815 |
Net sales |  |  |  | 203,896 | 231,584
Restructuring charges |  |  |  | 113 |
Operating Segments | Rail, Technologies, and Services |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Net sales |  |  |  | 326,869 | 312,160
Restructuring charges |  |  |  | 1,134 |
Accounts receivable, credit loss expense (reversal) |  |  |  |  | 1,862
Restructuring costs |  |  |  |  | 676
Operating Segments | Rail, Technologies, and Services | One Customer | Customer Concentration Risk |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Net sales |  |  |  | 71,800 |
Disposal Group, Not Discontinued Operations | Bridge Grid Deck Product |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Net sales |  |  |  | $ 3,700 | 6,146
Loss on asset divestitures |  |  |  |  | 1,403
Inventory write-down |  |  |  |  | 474
Personnel expenses |  |  |  |  | 667
Other exit costs |  |  |  |  | 262
Disposal Group, Not Discontinued Operations | Bridge Grid Deck Product | Cost of Sales |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Loss on asset divestitures |  |  |  |  | 1,141
Disposal Group, Not Discontinued Operations | Bridge Grid Deck Product | Selling, General and Administrative Expenses |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Loss on asset divestitures |  |  |  |  | $ 262
Cougar Mountain Precast, LLC |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Consideration transferred to acquire operating assets | $ 1,644 |  |  |  |
Coatings and Measurement |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Proceeds from asset divestitures |  |  | 5,344 |  |
Rail Products Business Unit |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Proceeds from asset divestitures |  | 2,362 |  |  |
Gain (loss) on asset divestitures |  | $ (1,009) | $ (2,065) |  |

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