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Revenue from Customers Revenue from Customers - Backlog By Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Backlog	$ 1,068,025	$ 850,725
Heavy Civil Construction
Segment Reporting Information [Line Items]
Backlog	834,049	780,706
Specialty Service
Segment Reporting Information [Line Items]
Backlog	$ 233,976	$ 70,019

X

- 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=118956577&loc=SL49130556-203045

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- Definition

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+ References

No definition available.

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- Details

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- Details

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