Segment Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) segment	Mar. 31, 2021 USD ($) segment	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2	2
Contract revenues	$ 174,931	$ 153,309
Operating (loss) income	(2,855)	2,055
Depreciation and amortization	(5,503)	(5,704)
Assets	340,876		$ 351,750
Property and equipment, net	104,974		$ 106,654
Marine Segment
Segment Reporting Information [Line Items]
Contract revenues	84,480	72,146
Marine Segment | Mexico and the Caribbean
Segment Reporting Information [Line Items]
Contract revenues	700	2,400
Concrete Segment
Segment Reporting Information [Line Items]
Contract revenues	90,451	81,163
Concrete Segment | Foreign
Segment Reporting Information [Line Items]
Contract revenues	0	0
Operating Segments | Marine Segment
Segment Reporting Information [Line Items]
Contract revenues	84,480	72,146
Operating (loss) income	1,840	2,848
Depreciation and amortization	(4,323)	(4,358)
Assets	173,577	268,345
Property and equipment, net	92,725	106,071
Operating Segments | Marine Segment | Revision of Prior Period, Error Correction, Adjustment
Segment Reporting Information [Line Items]
Operating (loss) income		2,900
Operating Segments | Concrete Segment
Segment Reporting Information [Line Items]
Contract revenues	90,451	81,163
Operating (loss) income	(4,695)	(793)
Depreciation and amortization	(1,940)	(2,127)
Assets	167,299	126,510
Property and equipment, net	12,249	14,808
Operating Segments | Concrete Segment | Revision of Prior Period, Error Correction, Adjustment
Segment Reporting Information [Line Items]
Operating (loss) income		(2,900)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Contract revenues	$ 0
Intersegment Eliminations | Maximum
Segment Reporting Information [Line Items]
Contract revenues		$ 100