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Assets Held for Sale - Significant Assets Included in Assets Held for Sale (Details) - Disposal Group, Held-for-sale, Not Discontinued Operations - USD ($) $ in Thousands | Apr. 20, 2018 | Mar. 31, 2018
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Long Lived Assets Held-for-sale [Line Items] |  |
Less: accumulated depreciation |  | $ (96,660)
Total assets held for sale |  | 98,386
Texas South Yard |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Less: accumulated depreciation |  | (43,808)
Total assets held for sale |  | 49,897
Texas North Yard |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Less: accumulated depreciation |  | (52,554)
Total assets held for sale |  | 46,600
Shipyard Division Assets |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Less: accumulated depreciation |  | (298)
Total assets held for sale |  | 1,889
South Texas Fabrication Yards | Subsequent Event |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Proceeds from sale of productive assets, net | $ 53,500 |
Land |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Total assets held for sale, gross |  | 5,492
Land | Texas South Yard |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Total assets held for sale, gross |  | 3,335
Land | Texas North Yard |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Total assets held for sale, gross |  | 2,157
Land | Shipyard Division Assets |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Total assets held for sale, gross |  | 0
Buildings and improvements |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Total assets held for sale, gross |  | 121,062
Buildings and improvements | Texas South Yard |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Total assets held for sale, gross |  | 90,370
Buildings and improvements | Texas North Yard |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Total assets held for sale, gross |  | 30,692
Buildings and improvements | Shipyard Division Assets |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Total assets held for sale, gross |  | 0
Machinery and equipment |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Total assets held for sale, gross |  | 68,492
Machinery and equipment | Texas South Yard |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Total assets held for sale, gross |  | 0
Machinery and equipment | Texas North Yard |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Total assets held for sale, gross |  | 66,305
Machinery and equipment | Shipyard Division Assets |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Total assets held for sale, gross |  | $ 2,187

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- Definition Disposal Group, Including Discontinued Operation, Accumulated Depreciation + References No definition available. + Details
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