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Revenue From Contracts With Customers - Revenue By Major Market End (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Total Revenue	$ 291,266	$ 304,219	$ 782,492	$ 704,047
Heavy Civil Construction
Disaggregation of Revenue [Line Items]
Total Revenue	254,544	263,278	665,068	625,887
Heavy Civil Construction | Heavy Highway
Disaggregation of Revenue [Line Items]
Total Revenue	151,882	179,608	385,843	438,741
Heavy Civil Construction | Commercial
Disaggregation of Revenue [Line Items]
Total Revenue	32,261	15,209	89,890	27,050
Heavy Civil Construction | Aviation
Disaggregation of Revenue [Line Items]
Total Revenue	30,587	22,863	81,671	56,310
Heavy Civil Construction | Water Containment and Treatment
Disaggregation of Revenue [Line Items]
Total Revenue	18,457	20,518	48,973	43,388
Heavy Civil Construction | Other Revenue
Disaggregation of Revenue [Line Items]
Total Revenue	$ 21,357	$ 25,080	$ 58,691	$ 60,398

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No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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