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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 49,712 | $ 49,884 | $ 161,016 | $ 133,745
Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (779) | (1,159) | (2,550) | (4,328)
Fabrication |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,311 | 18,318 | 28,171 | 42,517
Shipyard |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 24,492 | 15,074 | 66,677 | 51,798
Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 22,617 | 17,651 | 66,692 | 43,758
EPC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,071 | 0 | 2,026 | 0
Fixed-price and unit-rate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 37,360 | 37,212 | 122,934 | 106,790
Fixed-price and unit-rate | Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (779) | (1,159) | (2,550) | (4,328)
Fixed-price and unit-rate | Fabrication |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,311 | 18,318 | 28,171 | 42,517
Fixed-price and unit-rate | Shipyard |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 23,635 | 13,906 | 62,116 | 47,632
Fixed-price and unit-rate | Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 12,193 | 6,147 | 35,197 | 20,969
Fixed-price and unit-rate | EPC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 11,281 | 12,672 | 36,056 | 26,955
Time-and-materials | Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Time-and-materials | Fabrication |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Time-and-materials | Shipyard |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 857 | 1,168 | 4,561 | 4,166
Time-and-materials | Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 10,424 | 11,504 | 31,495 | 22,789
Time-and-materials | EPC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,071 | 0 | 2,026 | 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 | $ 1,071 | $ 0 | $ 2,026 | $ 0

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