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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 54,014 | $ 45,868 | $ 111,304 | $ 83,860
Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (1,283) | (1,821) | (1,771) | (3,170)
Fabrication |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 8,590 | 13,990 | 25,860 | 24,199
Shipyard |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 23,620 | 18,303 | 42,185 | 36,724
Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 22,205 | 15,396 | 44,075 | 26,107
EPC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 882 | 0 | 955 | 0
Lump sum and fixed-price construction |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 40,285 | 38,293 | 85,574 | 69,578
Lump sum and fixed-price construction | Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (1,283) | (1,821) | (1,771) | (3,170)
Lump sum and fixed-price construction | Fabrication |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 8,590 | 13,990 | 25,860 | 24,199
Lump sum and fixed-price construction | Shipyard |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 21,260 | 17,021 | 38,481 | 33,727
Lump sum and fixed-price construction | Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 11,718 | 9,103 | 23,004 | 14,822
Lump sum and fixed-price construction | EPC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Service contract revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 12,847 | 7,575 | 24,775 | 14,282
Service contract revenue | Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Service contract revenue | Fabrication |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Service contract revenue | Shipyard |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,360 | 1,282 | 3,704 | 2,997
Service contract revenue | Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 10,487 | 6,293 | 21,071 | 11,285
Service contract revenue | EPC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 882 | 0 | 955 | 0
Other | Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Other | Fabrication |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Other | Shipyard |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Other | Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Other | EPC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 882 | $ 0 | $ 955 | $ 0

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