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Fair Value Measurements (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 20, 2017 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jan. 31, 2017 | Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  | $ 0 | $ 0 | $ 0 |  |  |
Fair value of assets held for sale |  |  |  |  | 0 |  |  |  |
Held for sale |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Fair value of assets held for sale |  |  | $ 104,576,000 | 104,576,000 |  |  |  |  |
South Texas Fabrication Yards | Held for sale | Buckeye |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Potential sales price of real estate | $ 55,000,000 |  |  |  |  |  |  |  |
Prospect Shipyard | Held for sale |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Impairment of asset held for sale |  | $ 389,000 | $ 600,000 | 989,000 |  |  |  |  |
Specialty and High-Grade Copper Nickel and Steel | Fabrication |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  | 3,700,000 |  |  |  |  |
Inventory |  |  |  |  |  |  | $ 5,900,000 |  |
Specialty Piping and Valves | Fabrication |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  | $ 2,900,000 |  | $ 6,600,000 | 3,200,000 |  |
Fair value of assets held for sale |  |  |  |  |  |  | $ 10,300,000 |  |
Inventory |  |  |  |  | $ 3,700,000 |  |  |  | $ 13,500,000
Specialty Piping and Valves | Disposed of by sale | Fabrication |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Inventory disposed of |  |  |  |  |  |  |  | $ 472,000 |

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