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Revenue From Contracts With Customers - By Major Market End (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Total Revenue	$ 264,086	$ 268,734	$ 488,035	$ 491,226
Heavy Civil Construction
Disaggregation of Revenue [Line Items]
Total Revenue	228,130	223,283	409,314	410,524
Heavy Civil Construction | Heavy Highway
Disaggregation of Revenue [Line Items]
Total Revenue	129,964	126,554	223,574	233,962
Heavy Civil Construction | Commercial
Disaggregation of Revenue [Line Items]
Total Revenue	28,575	29,109	59,425	57,628
Heavy Civil Construction | Aviation
Disaggregation of Revenue [Line Items]
Total Revenue	37,061	27,832	66,998	51,084
Heavy Civil Construction | Water Containment and Treatment
Disaggregation of Revenue [Line Items]
Total Revenue	15,515	15,521	30,749	30,516
Heavy Civil Construction | Other Revenue
Disaggregation of Revenue [Line Items]
Total Revenue	$ 17,015	$ 24,267	$ 28,568	$ 37,334

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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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