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Commitments and Contingencies (Details) - USD ($) |  | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 10, 2017 | Dec. 31, 2015 | Sep. 30, 2017 | Dec. 31, 2016
Loss Contingencies [Line Items] |  |  |  |
Contract receivable |  |  | $ 25,513,000 | $ 20,169,000
Contracts in progress |  |  | 42,810,000 | $ 26,829,000
Change in estimated costs |  |  | 12,700,000 |
Minimum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Possible late delivery penalty per contract |  |  | 0 |
Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Possible late delivery penalty per contract |  |  | 5,600,000 |
Customer of Shipyard |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss contingency, damages sought by plaintiff | $ 84,800,000 |  |  |
Customer of Shipyard | Contract Receivable |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Contract receivable |  |  | 4,600,000 |
Contracts in progress |  |  | $ 4,900,000 |
Large Deepwater Project, Recently Delivered |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Contract losses |  | $ 24,500,000 |  |

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