Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) segment	Jun. 30, 2021 USD ($) segment	Jun. 30, 2022 USD ($) segment	Jun. 30, 2021 USD ($) segment	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2	2	2	2
Contract revenues	$ 194,575	$ 145,875	$ 369,506	$ 299,184
Operating (loss) income	(2,848)	5,566	(5,703)	7,621
Depreciation and amortization			(10,815)	(11,313)
Assets	351,482		351,482		$ 351,750
Property and equipment, net	104,307		104,307		$ 106,654
Marine Segment
Segment Reporting Information [Line Items]
Contract revenues	82,319	63,942	166,799	136,088
Marine Segment | Mexico and the Caribbean
Segment Reporting Information [Line Items]
Contract revenues	1,900	400	2,600	2,800
Concrete Segment
Segment Reporting Information [Line Items]
Contract revenues	112,256	81,933	202,707	163,096
Concrete Segment | Foreign
Segment Reporting Information [Line Items]
Contract revenues	0	0	0	0
Operating Segments | Marine Segment
Segment Reporting Information [Line Items]
Contract revenues	82,319	63,942	166,799	136,088
Operating (loss) income	2,516	8,606	4,356	11,454
Depreciation and amortization	(4,236)	(4,322)	(8,559)	(8,680)
Assets	219,138	253,658	219,138	253,658
Property and equipment, net	92,813	90,961	92,813	90,961
Operating Segments | Concrete Segment
Segment Reporting Information [Line Items]
Contract revenues	112,256	81,933	202,707	163,096
Operating (loss) income	(5,364)	(3,040)	(10,059)	(3,833)
Depreciation and amortization	(1,862)	(2,107)	(3,802)	(4,235)
Assets	132,344	129,547	132,344	129,547
Property and equipment, net	11,494	13,956	11,494	13,956
Intersegment Eliminations
Segment Reporting Information [Line Items]
Contract revenues	$ 100		$ 100
Intersegment Eliminations | Maximum
Segment Reporting Information [Line Items]
Contract revenues		$ 100		$ 100