Revenue (Tables)

9 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

Schedule of disaggregation of revenue

	Three months ended September 30,				Nine months ended September 30,
	2021		2020		2021		2020
Marine Segment
Construction	$	38,883	$	86,505	$	121,678	$	205,459
Dredging		13,157		24,262		58,511		79,391
Specialty Services		2,699		2,114		10,638		5,699
Marine segment contract revenues	$	54,739	$	112,881	$	190,827	$	290,549
Concrete Segment
Structural	$	13,090	$	21,116	$	47,296	$	66,893
Light Commercial		72,078		55,436		200,961		182,311
Other		—		—		7		13
Concrete segment contract revenues	$	85,168	$	76,552	$	248,264	$	249,217
Total contract revenues	$	139,907	$	189,433	$	439,091	$	539,766