Quarterly report pursuant to Section 13 or 15(d)

ASSETS HELD FOR SALE - Significant Assets Included in Assets Held for Sale (Details)

v3.7.0.1
ASSETS HELD FOR SALE - Significant Assets Included in Assets Held for Sale (Details) - Disposal Group, Held-for-sale, Not Discontinued Operations
$ in Thousands
Mar. 31, 2017
USD ($)
Long Lived Assets Held-for-sale [Line Items]  
Less: accumulated depreciation $ (121,266)
Total assets held for sale 110,545
South Texas Fabrication Yards  
Long Lived Assets Held-for-sale [Line Items]  
Less: accumulated depreciation (120,560)
Total assets held for sale 105,038
Prospect Shipyard  
Long Lived Assets Held-for-sale [Line Items]  
Less: accumulated depreciation (706)
Total assets held for sale 5,507
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 106,736
Machinery and equipment | South Texas Fabrication Yards  
Long Lived Assets Held-for-sale [Line Items]  
Total assets held for sale, gross 100,605
Machinery and equipment | Prospect Shipyard  
Long Lived Assets Held-for-sale [Line Items]  
Total assets held for sale, gross 6,131
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 800
Vehicles | South Texas Fabrication Yards  
Long Lived Assets Held-for-sale [Line Items]  
Total assets held for sale, gross 800
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 252
Other | South Texas Fabrication Yards  
Long Lived Assets Held-for-sale [Line Items]  
Total assets held for sale, gross 252
Other | Prospect Shipyard  
Long Lived Assets Held-for-sale [Line Items]  
Total assets held for sale, gross $ 0