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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 57,290 | $ 37,993
Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | (488) | (1,350)
Fabrication Division |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 17,270 | 10,209
Shipyard Division |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 18,565 | 18,422
Services Division |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 21,870 | 10,712
EPC Division |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 73 | 0
Lump sum and fixed-price construction |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 45,289 | 31,287
Lump sum and fixed-price construction | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | (488) | (1,350)
Lump sum and fixed-price construction | Fabrication Division |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 17,270 | 10,209
Lump sum and fixed-price construction | Shipyard Division |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 17,222 | 16,707
Lump sum and fixed-price construction | Services Division |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 11,285 | 5,721
Lump sum and fixed-price construction | EPC Division |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Service contract revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 11,928 | 6,706
Service contract revenue | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Service contract revenue | Fabrication Division |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Service contract revenue | Shipyard Division |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,343 | 1,715
Service contract revenue | Services Division |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 10,585 | 4,991
Service contract revenue | EPC Division |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 73 | 0
Other | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Other | Fabrication Division |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Other | Shipyard Division |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Other | Services Division |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Other | EPC Division |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 73 | $ 0

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