Annual report pursuant to Section 13 and 15(d)

Revenue, Contract Assets and Liabilities and Other Contract Matters - Summary of Disaggregation of Revenue (Details)

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Revenue, Contract Assets and Liabilities and Other Contract Matters - Summary of Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]                      
Revenue $ 79,445 $ 75,802 $ 80,456 $ 67,605 $ 60,231 $ 49,712 $ 54,014 $ 57,290 $ 303,308 $ 221,247 $ 171,022
Eliminations                      
Disaggregation of Revenue [Line Items]                      
Revenue                 (7,667) (3,827) (5,200)
Fabrication                      
Disaggregation of Revenue [Line Items]                      
Revenue                 70,052 40,420 58,078
Shipyard                      
Disaggregation of Revenue [Line Items]                      
Revenue                 159,217 96,424 52,699
Services                      
Disaggregation of Revenue [Line Items]                      
Revenue                 81,706 88,230 65,445
Fixed-price and unit-rate                      
Disaggregation of Revenue [Line Items]                      
Revenue                 247,620 165,505 129,234
Fixed-price and unit-rate | Eliminations                      
Disaggregation of Revenue [Line Items]                      
Revenue                 (5,169) (2,414) (5,096)
Fixed-price and unit-rate | Fabrication                      
Disaggregation of Revenue [Line Items]                      
Revenue                 70,052 40,420 58,078
Fixed-price and unit-rate | Shipyard                      
Disaggregation of Revenue [Line Items]                      
Revenue                 152,590 88,887 47,787
Fixed-price and unit-rate | Services                      
Disaggregation of Revenue [Line Items]                      
Revenue                 30,147 38,612 28,465
T&M                      
Disaggregation of Revenue [Line Items]                      
Revenue                 47,641 51,018 40,092
T&M | Shipyard                      
Disaggregation of Revenue [Line Items]                      
Revenue                 6,627 7,537 4,912
T&M | Services                      
Disaggregation of Revenue [Line Items]                      
Revenue                 41,014 43,481 35,180
Other                      
Disaggregation of Revenue [Line Items]                      
Revenue                 8,047 4,724 1,696
Other | Eliminations                      
Disaggregation of Revenue [Line Items]                      
Revenue                 (2,498) (1,413) (104)
Other | Services                      
Disaggregation of Revenue [Line Items]                      
Revenue                 $ 10,545 $ 6,137 $ 1,800