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Business Segments (Reconciliation of Assets from Segment to Consolidated) (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Segment Reporting Information |  |
Assets | $ 373,420 | $ 396,556
Operating Segments | Rail Products and Services |  |
Segment Reporting Information |  |
Assets | 171,081 | 192,038
Operating Segments | Construction Products |  |
Segment Reporting Information |  |
Assets | 81,325 | 83,154
Operating Segments | Tubular and Energy Services |  |
Segment Reporting Information |  |
Assets | 97,755 | 100,706
Unallocated corporate assets |  |
Segment Reporting Information |  |
Assets | $ 23,259 | $ 20,658

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