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Organization and Summary of Significant Accounting Policies (Details) $ in Millions |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 20, 2018 USD ($) | Jan. 03, 2018 USD ($) | Mar. 31, 2018 vessel | Jun. 30, 2018 USD ($) vessel segment | Dec. 31, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Number of harbor tug vessels | vessel |  |  |  | 10 |
Number of offshore vessels | vessel |  |  |  | 2 |
Number of additional vessels | vessel |  |  | 7 | 7 |
Number of operating segments | segment |  |  |  | 4 |
Operating loss carryforwards |  |  |  |  | $ 62.8
Valuation allowance |  |  |  | $ 1.4 | 0.4
Expire In 2035 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating loss carryforwards |  |  |  |  | $ 4.0
South Texas Fabrication Yards | Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Sale of PP&E | $ 55.0 |  |  |  |
Cost of PP&E sales | 1.5 |  |  |  |
Proceeds from sale of PP&E | $ 52.7 | $ 0.8 |  |  |

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