Quarterly report pursuant to Section 13 or 15(d)

Operating Segments - Summarized Segment Financial Information (Parenthetical) (Details)

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Operating Segments - Summarized Segment Financial Information (Parenthetical) (Details) - Forty-Vehicle Ferry
$ in Millions
3 Months Ended
Mar. 31, 2020
Vechicle
Mar. 31, 2019
USD ($)
Vechicle
Segment Reporting Information [Line Items]    
Revenue reclassified between the Shipyard and Fabrication & Services segments | $   $ 0.8
Number of vehicle ferry projects | Vechicle 2 2