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Assets Held for Sale - Narrative (Details) |  |  | 3 Months Ended | 7 Months Ended
--- | --- | --- | --- | ---
Apr. 20, 2018 USD ($) | Jan. 03, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) T | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) drydock | Mar. 31, 2017 USD ($) | Mar. 31, 2018 USD ($)
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |  |
Number of drydocks sold | drydock |  |  |  |  |  | 2 |  |
Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment held for sale |  |  |  | $ 98,386,000 |  |  |  | $ 98,386,000
Disposal Group, Held-for-sale, Not Discontinued Operations | South Texas Fabrication Yards |  |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of PP&E |  | $ 750,000 |  |  |  |  |  |
Insurance deductible, percent |  |  |  | 3.00% |  |  |  | 3.00%
Estimated insurance recoveries |  |  |  | $ 17,800,000 |  |  |  | $ 17,800,000
Insurance initial payment |  |  |  | 2,200,000 |  |  |  | 8,200,000
Clean-up and repair related costs due to Hurricane Harvey |  |  |  |  |  |  |  | 1,600,000
Accrual for future repairs |  |  |  |  | $ 1,500,000 |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | South Texas Fabrication Yards | Maximum |  |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |  |
Insurance coverage |  |  |  | 25,000,000 |  |  |  | 25,000,000
Disposal Group, Held-for-sale, Not Discontinued Operations | South Texas Fabrication Yards | Minimum |  |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |  |
Insurance deductible, value |  |  |  |  | 500,000 |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Texas North Yard |  |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |  |
Impairment of real estate |  |  |  | 5,100,000 |  |  |  |
Impairment of equipment |  |  |  | 750,000 |  |  |  |
Property, plant and equipment held for sale |  |  |  | 46,600,000 |  |  |  | 46,600,000
Disposal Group, Held-for-sale, Not Discontinued Operations | Shipyard Division Assets |  |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |  |
Impairment of assets held for sale |  |  |  |  | $ 600,000 |  | $ 389,000 |
Property, plant and equipment held for sale |  |  |  | $ 1,889,000 |  |  |  | 1,889,000
Disposal Group, Held-for-sale, Not Discontinued Operations | Subsequent Event | South Texas Fabrication Yards |  |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |  |
Sale of PP&E | $ 55,000,000 |  |  |  |  |  |  |
Cost of PP&E sales | 1,500,000 |  |  |  |  |  |  |
Proceeds from sale of PP&E | 52,700,000 |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  | $ 3,800,000 |  |  |  |  |
Decrease in assets held for sale | $ 49,900,000 |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Shipyard Division Assets |  |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |  |
Sale of PP&E |  |  |  |  |  | $ 2,000,000 |  |
Gain (loss) on sale of assets |  |  |  |  |  | $ (259,000) |  |
Drydock, number of tons | T |  |  |  | 2,500 |  |  |  |
Property, plant and equipment held for sale |  |  |  | $ 1,900,000 |  |  |  | $ 1,900,000

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