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Revenue from Customers Revenue from Customers - Backlog By Segment (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Backlog | $ 1,175,388 | $ 1,068,025
Heavy Civil Construction |  |
Segment Reporting Information [Line Items] |  |
Backlog | 898,183 | 834,049
Specialty Service |  |
Segment Reporting Information [Line Items] |  |
Backlog | $ 277,205 | $ 233,976

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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 + Details
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- Details
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- Details
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