Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Contract revenues	$ 188,653	$ 160,672
Costs of contract revenues	165,638	145,134
Gross profit	23,015	15,538
Selling, general and administrative expenses	22,545	18,999
Gain on disposal of assets, net	(363)	(337)
Operating income (loss)	833	(3,124)
Total assets	416,310		$ 417,317
Property and equipment, net	91,956		$ 86,098
Marine
Segment Reporting Information [Line Items]
Contract revenues	127,163	106,325
Costs of contract revenues	108,638	100,120
Gross profit	18,525	6,205
Selling, general and administrative expenses	13,918	11,155
Gain on disposal of assets, net	(171)	(84)
Operating income (loss)	$ 4,778	$ (4,866)
Contract revenues, percent	100.00%	100.00%
Costs of contract revenues, percent	85.40%	94.20%
Gross profit, percent	14.60%	5.80%
Selling, general and administrative expenses, percent	10.90%	10.50%
Gain on disposal of assets, net, percent	(0.10%)	(0.10%)
Operating income (loss), percent	3.80%	(4.60%)
Total assets	$ 322,937	$ 275,969
Property and equipment, net	87,665	80,261
Depreciation and amortization	4,531	4,930
Capital expenditures	8,971	1,507
Concrete
Segment Reporting Information [Line Items]
Contract revenues	61,490	54,347
Costs of contract revenues	57,000	45,014
Gross profit	4,490	9,333
Selling, general and administrative expenses	8,627	7,844
Gain on disposal of assets, net	(192)	(253)
Operating income (loss)	$ (3,945)	$ 1,742
Contract revenues, percent	100.00%	100.00%
Costs of contract revenues, percent	92.70%	82.80%
Gross profit, percent	7.30%	17.20%
Selling, general and administrative expenses, percent	14.00%	14.50%
Gain on disposal of assets, net, percent	(0.30%)	(0.50%)
Operating income (loss), percent	(6.40%)	3.20%
Total assets	$ 93,373	$ 87,615
Property and equipment, net	4,291	5,212
Depreciation and amortization	872	1,089
Capital expenditures	$ 62	$ 346