Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Contract revenues	$ 225,097	$ 226,675	$ 619,037	$ 579,514
Costs of contract revenues	195,345	199,611	540,473	518,631
Gross profit	29,752	27,064	78,564	60,883
Selling, general and administrative expenses	25,059	20,846	70,378	60,980
Gain on disposal of assets, net	(628)	(1,563)	(1,400)	(1,986)
Operating income	5,321	7,781	9,586	1,889
Total assets	422,375		422,375		$ 417,317
Property and equipment, net	101,114		101,114		$ 86,098
Intersegment Eliminations
Segment Reporting Information [Line Items]
Contract revenues	1,200	100	2,800	1,800
Marine
Segment Reporting Information [Line Items]
Contract revenues	142,943	140,013	405,409	377,291
Marine | Operating Segments
Segment Reporting Information [Line Items]
Contract revenues	142,943	140,013	405,409	377,291
Costs of contract revenues	117,061	122,418	340,856	343,416
Gross profit	25,882	17,595	64,553	33,875
Selling, general and administrative expenses	15,143	13,108	43,202	39,867
Gain on disposal of assets, net	(246)	(998)	(642)	(1,144)
Operating income	10,985	5,485	21,993	(4,848)
Total assets	342,525	322,031	342,525	322,031
Property and equipment, net	97,103	80,115	97,103	80,115
Depreciation and amortization	5,081	4,553	13,985	14,405
Capital expenditures	8,788	3,964	24,634	8,740
Concrete
Segment Reporting Information [Line Items]
Contract revenues	82,154	86,662	213,628	202,223
Concrete | Operating Segments
Segment Reporting Information [Line Items]
Contract revenues	82,154	86,662	213,628	202,223
Costs of contract revenues	78,284	77,193	199,617	175,215
Gross profit	3,870	9,469	14,011	27,008
Selling, general and administrative expenses	9,916	7,738	27,176	21,113
Gain on disposal of assets, net	(382)	(565)	(758)	(842)
Operating income	(5,664)	2,296	(12,407)	6,737
Total assets	79,850	91,988	79,850	91,988
Property and equipment, net	4,011	5,860	4,011	5,860
Depreciation and amortization	811	1,015	2,541	3,153
Capital expenditures	$ 557	$ 193	$ 876	$ 1,904