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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | For the years ended December 31, 2020, 2019, and 2018, net sales by the timing of the transfer of goods and services were as follows:
Year Ended December 31, 2020 |  | Rail Technologies and Services |  | Infrastructure Solutions |  | Total
Point in time |  | $ | 212,212 |  |  | $ | 139,179 |  |  | $ | 351,391 |
Over time |  | 64,235 |  |  | 81,785 |  |  | 146,020 |
Total net sales |  | $ | 276,447 |  |  | $ | 220,964 |  |  | $ | 497,411 |
Year Ended December 31, 2019 |  | Rail Technologies and Services |  | Infrastructure Solutions |  | Total
Point in time |  | $ | 240,047 |  |  | $ | 189,606 |  |  | $ | 429,653 |
Over time |  | 81,761 |  |  | 105,014 |  |  | 186,775 |
Total net sales |  | $ | 321,808 |  |  | $ | 294,620 |  |  | $ | 616,428 |
Year Ended December 31, 2018 |  | Rail Technologies and Services |  | Infrastructure Solutions |  | Total
Point in time |  | $ | 232,814 |  |  | $ | 184,997 |  |  | $ | 417,811 |
Over time |  | 86,710 |  |  | 76,543 |  |  | 163,253 |
Total net sales |  | $ | 319,524 |  |  | $ | 261,540 |  |  | $ | 581,064 |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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