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Fair Value Measurement (Details) - Disposal Group, Held-for-sale, Not Discontinued Operations - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 10 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 28, 2017
South Texas Fabrication Yards |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |
Insurance settlement |  |  |  |  |  |  | $ 15.4
Texas North Yard |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |
Impairment of real estate |  | $ 5.1 |  |  |  | $ 8.9 |
Impairment of assets held for sale |  | $ 0.8 |  |  |  |  |
Shipyard Division Assets |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |
Impairment of assets held for sale | $ 0.6 |  | $ 0.6 | $ 0.4 | $ 0.4 |  |

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