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Revenue (Summary of Type of Work, Contract Revenues) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 132,667 $ 149,428 $ 290,711 $ 343,777
Type of Work [Member] | Operating Segment [Member] | Dredging [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 132,667 149,428 290,711 343,777
Type of Work [Member] | Operating Segment [Member] | Dredging [Member] | Capital-U.S. [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 38,157 89,693 70,632 190,704
Type of Work [Member] | Operating Segment [Member] | Dredging [Member] | Coastal Protection [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 56,490 45,119 107,795 117,036
Type of Work [Member] | Operating Segment [Member] | Dredging [Member] | Maintenance [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 35,809 12,648 107,737 32,460
Type of Work [Member] | Operating Segment [Member] | Dredging [Member] | Rivers & Lakes [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 2,211 $ 1,968 $ 4,547 $ 3,577