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Revenue from Contracts with Customers - Revenue By Major Market End (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenues	$ 255,175	$ 291,266	$ 268,734	$ 222,492	$ 253,911	$ 304,219	$ 246,412	$ 153,416	$ 1,037,667	$ 957,958	$ 690,123
Heavy Civil Construction
Disaggregation of Revenue [Line Items]
Revenues									885,971	849,966	690,123
Heavy Civil Construction | Heavy Highway
Disaggregation of Revenue [Line Items]
Revenues									513,231	579,157	542,011
Heavy Civil Construction | Commercial
Disaggregation of Revenue [Line Items]
Revenues									120,388	48,314	31,664
Heavy Civil Construction | Aviation
Disaggregation of Revenue [Line Items]
Revenues									111,824	77,399	27,926
Heavy Civil Construction | Water Containment and Treatment
Disaggregation of Revenue [Line Items]
Revenues									66,928	59,593	39,918
Heavy Civil Construction | Other Revenue
Disaggregation of Revenue [Line Items]
Revenues									$ 73,600	$ 85,503	$ 48,604

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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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