Revenue (Tables)

9 Months Ended

Sep. 30, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

	Three months ended September 30,				Nine months ended September 30,
	2019		2018		2019		2018
Marine Segment
Construction	$	72,609	$	46,113	$	163,426	$	141,348
Dredging		29,404		13,053		82,762		53,536
Specialty Services		5,391		4,313		11,726		12,083
Marine segment contract revenues	$	107,404	$	63,479	$	257,914	$	206,967
Concrete Segment
Structural	$	13,439	$	13,054	$	37,595	$	47,166
Light Commercial		78,587		48,458		212,958		167,140
Other		77		82		130		409
Concrete segment contract revenues	$	92,103	$	61,594	$	250,683	$	214,715
Total contract revenues	$	199,507	$	125,073	$	508,597	$	421,682