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Revenue from Customers - Revenue Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 346,544	$ 291,699	$ 264,086	$ 223,949	$ 255,175	$ 291,266	$ 268,734	$ 222,492	$ 1,126,278	$ 1,037,667	$ 957,958
Heavy Civil Construction
Disaggregation of Revenue [Line Items]
Revenues	190,690	218,894	200,236	150,505	190,443	222,299	194,174	158,722	760,325	765,638	801,652
Heavy Civil Construction | Heavy Highway
Disaggregation of Revenue [Line Items]
Revenues									483,175	513,376	579,157
Heavy Civil Construction | Aviation
Disaggregation of Revenue [Line Items]
Revenues									141,371	111,824	77,399
Heavy Civil Construction | Water Containment and Treatment
Disaggregation of Revenue [Line Items]
Revenues									65,795	66,928	59,593
Heavy Civil Construction | Other Revenue
Disaggregation of Revenue [Line Items]
Revenues									69,984	73,510	85,503
Specialty Service
Disaggregation of Revenue [Line Items]
Revenues	121,388	32,863	27,894	30,679	30,460	32,245	29,109	28,519	212,824	120,333	48,314
Specialty Service | Land Development
Disaggregation of Revenue [Line Items]
Revenues									84,637	0	0
Specialty Service | Commercial
Disaggregation of Revenue [Line Items]
Revenues									128,187	120,333	48,314
Residential
Disaggregation of Revenue [Line Items]
Revenues	$ 34,466	$ 39,942	$ 35,956	$ 42,765	$ 34,272	$ 36,722	$ 45,451	$ 35,251	153,129	151,696	107,992
Fixed Unit Price
Disaggregation of Revenue [Line Items]
Revenues									708,638	733,047	755,840
Lump Sum
Disaggregation of Revenue [Line Items]
Revenues									262,237	146,874	57,823
Residential And Other
Disaggregation of Revenue [Line Items]
Revenues									$ 155,403	$ 157,746	$ 144,295

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+ References

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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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