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Segment Information - Revenue, Operating Income, and Assets, By Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total Revenue	$ 291,266	$ 304,219	$ 782,492	$ 704,047
Operating income	14,372	12,639	33,201	19,207
Assets	494,164		494,164		$ 463,298
Heavy Civil Construction
Segment Reporting Information [Line Items]
Total Revenue	254,544	263,278	665,068	625,887
Operating income	9,191	6,960	17,488	8,627
Assets	363,058		363,058		354,090
Residential Construction
Segment Reporting Information [Line Items]
Total Revenue	36,722	40,941	117,424	78,160
Operating income	5,181	$ 5,679	15,713	$ 10,580
Assets	$ 131,106		$ 131,106		$ 109,208

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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