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Revenue From Contracts With Customers - Backlog By Segment (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Disaggregation of Revenue [Line Items] |  |
Backlog | $ 1,133,814 | $ 1,068,025
Heavy Civil |  |
Disaggregation of Revenue [Line Items] |  |
Backlog | 874,822 | 834,049
Specialty Services |  |
Disaggregation of Revenue [Line Items] |  |
Backlog | $ 258,992 | $ 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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