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Segment Information - Revenue, Operating Income, and Assets, By Reportable Segment (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
Segment Reporting Information [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
Depreciation and amortization									20,740	16,770	16,994
Operating Income	9,732	12,115	11,184	4,720	9,410	14,373	12,149	6,679	37,751	42,611	26,176
Acquisition related costs	(2,153)	(1,896)	(262)	0					(4,311)	0	0
Assets	961,940				482,573				961,940	482,573
Heavy Civil
Segment Reporting Information [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
Depreciation and amortization									12,839	13,492	14,789
Operating Income	(7,704)	7,420	5,747	(2,147)	4,245	7,385	4,322	1,092	3,316	17,044	8,246
Assets	287,779				318,586				287,779	318,586
Specialty Services
Segment Reporting Information [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
Depreciation and amortization									6,059	1,439	815
Operating Income	14,923	1,371	865	1,048	983	1,647	1,480	519	18,207	4,629	2,284
Assets	587,642				76,170				587,642	76,170
Residential
Segment Reporting Information [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
Depreciation and amortization									1,842	1,839	1,390
Operating Income	4,666	5,220	4,834	5,819	4,182	$ 5,341	$ 6,347	$ 5,068	20,539	20,938	15,646
Assets	86,519				$ 87,817				86,519	87,817
Operating Segments
Segment Reporting Information [Line Items]
Operating Income	$ 11,885	$ 14,011	$ 11,446	$ 4,720					$ 42,062	$ 42,611	$ 26,176

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.

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