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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 $ in Thousands | Sep. 30, 2017 USD ($)
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Long Lived Assets Held-for-sale [Line Items] |
Less: accumulated depreciation | $ (113,894)
Total assets held for sale | 107,010
South Texas Fabrication Yards |
Long Lived Assets Held-for-sale [Line Items] |
Less: accumulated depreciation | (113,596)
Total assets held for sale | 104,507
Prospect Shipyard |
Long Lived Assets Held-for-sale [Line Items] |
Less: accumulated depreciation | (298)
Total assets held for sale | 2,503
Land |
Long Lived Assets Held-for-sale [Line Items] |
Total assets held for sale, gross | 5,492
Land | South Texas Fabrication Yards |
Long Lived Assets Held-for-sale [Line Items] |
Total assets held for sale, gross | 5,492
Land | Prospect Shipyard |
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 | 117,582
Buildings and improvements | South Texas Fabrication Yards |
Long Lived Assets Held-for-sale [Line Items] |
Total assets held for sale, gross | 117,582
Buildings and improvements | Prospect Shipyard |
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 | 96,271
Machinery and equipment | South Texas Fabrication Yards |
Long Lived Assets Held-for-sale [Line Items] |
Total assets held for sale, gross | 93,552
Machinery and equipment | Prospect Shipyard |
Long Lived Assets Held-for-sale [Line Items] |
Total assets held for sale, gross | 2,719
Furniture and fixtures |
Long Lived Assets Held-for-sale [Line Items] |
Total assets held for sale, gross | 949
Furniture and fixtures | South Texas Fabrication Yards |
Long Lived Assets Held-for-sale [Line Items] |
Total assets held for sale, gross | 867
Furniture and fixtures | Prospect Shipyard |
Long Lived Assets Held-for-sale [Line Items] |
Total assets held for sale, gross | 82
Vehicles |
Long Lived Assets Held-for-sale [Line Items] |
Total assets held for sale, gross | 610
Vehicles | South Texas Fabrication Yards |
Long Lived Assets Held-for-sale [Line Items] |
Total assets held for sale, gross | 610
Vehicles | Prospect Shipyard |
Long Lived Assets Held-for-sale [Line Items] |
Total assets held for sale, gross | 0
Other |
Long Lived Assets Held-for-sale [Line Items] |
Total assets held for sale, gross | 0
Other | South Texas Fabrication Yards |
Long Lived Assets Held-for-sale [Line Items] |
Total assets held for sale, gross | 0
Other | Prospect Shipyard |
Long Lived Assets Held-for-sale [Line Items] |
Total assets held for sale, gross | $ 0

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- Definition Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Gross + References No definition available. + Details
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- Definition Amount classified as property, plant and equipment attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2473-110228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721533-107759 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1107-107759 + Details
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