Revenue (Tables)

12 Months Ended

Dec. 31, 2021

Revenue from Contract with Customer [Abstract]

Schedule of disaggregation of revenue

	Year ended December 31,
	2021		2020		2019
Marine Segment
Construction	$	169,554	$	272,870	$	242,527
Dredging		80,831		106,647		112,303
Specialty Services		13,530		8,656		14,308
Marine segment contract revenues	$	263,915	$	388,173	$	369,138
Concrete Segment
Structural	$	58,420	$	85,904	$	54,497
Light Commercial		279,018		235,835		284,624
Other		7		30		131
Concrete segment contract revenues	$	337,445	$	321,769	$	339,252
Total contract revenues	$	601,360	$	709,942	$	708,390