Revenue (Tables)

9 Months Ended

Sep. 30, 2020

Revenue from Contract with Customer [Abstract]

Schedule of disaggregation of revenue

	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
Marine Segment
Construction	$	86,505	$	72,609	$	205,459	$	163,426
Dredging		24,262		29,404		79,391		82,762
Specialty Services		2,114		5,391		5,699		11,726
Marine segment contract revenues	$	112,881	$	107,404	$	290,549	$	257,914
Concrete Segment
Structural	$	21,116	$	13,439	$	66,893	$	37,595
Light Commercial		55,436		78,587		182,311		212,958
Other		—		77		13		130
Concrete segment contract revenues	$	76,552	$	92,103	$	249,217	$	250,683
Total contract revenues	$	189,433	$	199,507	$	539,766	$	508,597