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Revenue (Tables) | 3 Months Ended
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Mar. 31, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table summarizes the Company's net sales by major product category:
|  | Three Months Ended March 31,
|  | 2018 |  | 2017
Rail Products |  | $ | 36,034 |  |  | $ | 34,365 |
Rail Technologies |  | 26,136 |  |  | 22,115 |
Rail Products and Services |  | 62,170 |  |  | 56,480 |
Piling and Fabricated Bridge |  | 18,861 |  |  | 29,223 |
Precast Concrete Products |  | 10,039 |  |  | 8,099 |
Construction Products |  | 28,900 |  |  | 37,322 |
Test, Inspection, and Threading |  | 14,213 |  |  | 10,882 |
Protective Coatings and Measurement Solutions |  | 17,171 |  |  | 14,018 |
Tubular and Energy Services |  | 31,384 |  |  | 24,900 |
Total net sales |  | $ | 122,454 |  |  | $ | 118,702 |
Net sales by the timing of the transfer of goods and services is as follows:
Three Months Ended March 31, 2018 |  | Rail Products and Services |  | Construction Products |  | Tubular and Energy Services |  | Total
Point in time |  | $ | 45,871 |  |  | $ | 18,926 |  |  | $ | 26,435 |  |  | $ | 91,232 |
Over time |  | 16,299 |  |  | 9,974 |  |  | 4,949 |  |  | 31,222 |
Total net sales |  | $ | 62,170 |  |  | $ | 28,900 |  |  | $ | 31,384 |  |  | $ | 122,454 |
Three Months Ended March 31, 2017 |  | Rail Products and Services |  | Construction Products |  | Tubular and Energy Services |  | Total
Point in time |  | $ | 45,566 |  |  | $ | 24,624 |  |  | $ | 20,939 |  |  | $ | 91,129 |
Over time |  | 10,914 |  |  | 12,698 |  |  | 3,961 |  |  | 27,573 |
Total net sales |  | $ | 56,480 |  |  | $ | 37,322 |  |  | $ | 24,900 |  |  | $ | 118,702 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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