Revenue (Tables)

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer [Abstract]

Schedule of disaggregation of revenue

	Year ended December 31,
	2019		2018
Marine Segment
Construction	$	242,527	$	156,925
Dredging		112,303		73,237
Specialty Services		14,308		13,721
Marine segment contract revenues	$	369,138	$	243,883
Concrete Segment
Light Commercial	$	284,624	$	215,628
Structural		54,497		60,926
Other		131		457
Concrete segment contract revenues	$	339,252	$	277,011
Total contract revenues	$	708,390	$	520,894