Segment Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) segment	Mar. 31, 2022 USD ($) segment	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2	2
Contract revenues	$ 159,174	$ 174,931
Operating income (loss)	(10,643)	(2,855)
Depreciation and amortization	(4,721)	(5,503)
Assets	344,187		$ 367,155
Property and equipment, net of depreciation	97,307		$ 100,977
Marine Segment
Segment Reporting Information [Line Items]
Contract revenues	79,298	84,480
Marine Segment | Mexico and the Caribbean
Segment Reporting Information [Line Items]
Contract revenues	2,800	700
Concrete Segment
Segment Reporting Information [Line Items]
Contract revenues	79,876	90,451
Concrete Segment | Foreign
Segment Reporting Information [Line Items]
Contract revenues	0	0
Operating Segments | Marine Segment
Segment Reporting Information [Line Items]
Contract revenues	79,298	84,480
Operating income (loss)	(6,080)	1,840
Depreciation and amortization	(3,835)	(4,323)
Assets	231,851	173,577
Property and equipment, net of depreciation	88,957	92,725
Operating Segments | Concrete Segment
Segment Reporting Information [Line Items]
Contract revenues	79,876	90,451
Operating income (loss)	(4,563)	(4,695)
Depreciation and amortization	(1,611)	(1,940)
Assets	112,336	167,299
Property and equipment, net of depreciation	8,350	12,249
Intersegment Eliminations
Segment Reporting Information [Line Items]
Contract revenues		$ 0
Intersegment Eliminations | Maximum
Segment Reporting Information [Line Items]
Contract revenues	$ 100