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Revenue From Customers - Backlog By Segment (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Disaggregation of Revenue [Line Items] |  |
Backlog | $ 1,570,641 | $ 1,175,388
Heavy Civil |  |
Disaggregation of Revenue [Line Items] |  |
Backlog | 1,183,122 | 898,183
Specialty Services |  |
Disaggregation of Revenue [Line Items] |  |
Backlog | $ 387,519 | $ 277,205

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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=123351226&loc=SL49130556-203045 + Details
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