Operating Segments - Summarized Segment Financial Information (Details) $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2017
USD ($)
vessel
|
Sep. 30, 2017
USD ($)
|
Jun. 30, 2017
USD ($)
|
Mar. 31, 2017
USD ($)
|
Dec. 31, 2016
USD ($)
|
Sep. 30, 2016
USD ($)
|
Jun. 30, 2016
USD ($)
|
Mar. 31, 2016
USD ($)
|
Dec. 31, 2017
USD ($)
vessel
|
Dec. 31, 2016
USD ($)
|
Dec. 31, 2015
USD ($)
|
|
| Segment Reporting Information [Line Items] | |||||||||||
| Revenue | $ 37,277 | $ 49,884 | $ 45,868 | $ 37,993 | $ 55,461 | $ 65,384 | $ 81,502 | $ 83,979 | $ 171,022 | $ 286,326 | $ 306,120 |
| Gross profit (loss) | (25,914) | $ (494) | $ (11,620) | $ (4,897) | (173) | $ 5,259 | $ 14,066 | $ 5,701 | (42,925) | 24,853 | (15,156) |
| Operating income (loss) | (68,397) | 5,183 | (38,614) | ||||||||
| Depreciation expense | 12,745 | 25,448 | 26,204 | ||||||||
| Capital expenditures | 4,834 | 6,795 | 6,018 | ||||||||
| Total Assets | 270,840 | 322,408 | 270,840 | 322,408 | 316,923 | ||||||
| Loss related to cost overruns and re-work | $ 22,500 | $ 34,500 | |||||||||
| Number of multi-purpose service vessels being constructed | vessel | 2 | 2 | |||||||||
| Estimated liquidated damages | $ 233 | ||||||||||
| Operating Segments | Fabrication | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Revenue | $ 57,880 | 88,683 | 151,576 | ||||||||
| Gross profit (loss) | (1,941) | 5,276 | (36,990) | ||||||||
| Operating income (loss) | (12,040) | 1,500 | (49,295) | ||||||||
| Depreciation expense | 6,592 | 18,566 | 22,045 | ||||||||
| Capital expenditures | 2,395 | 2,633 | 3,360 | ||||||||
| Total Assets | 195,187 | 272,292 | 195,187 | 272,292 | 310,790 | ||||||
| Operating Segments | Shipyard | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Revenue | 52,699 | 109,502 | 59,601 | ||||||||
| Gross profit (loss) | (44,870) | 7,801 | 8,750 | ||||||||
| Operating income (loss) | (49,785) | 2,375 | 7,695 | ||||||||
| Depreciation expense | 4,073 | 4,686 | 1,921 | ||||||||
| Capital expenditures | 1,909 | 1,861 | 1,206 | ||||||||
| Total Assets | 74,516 | 81,928 | 74,516 | 81,928 | 54,543 | ||||||
| Operating Segments | Services | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Revenue | 65,445 | 91,414 | 100,431 | ||||||||
| Gross profit (loss) | 4,575 | 12,420 | 13,937 | ||||||||
| Operating income (loss) | 1,874 | 9,106 | 11,353 | ||||||||
| Depreciation expense | 1,676 | 1,775 | 1,733 | ||||||||
| Capital expenditures | 403 | 1,495 | 1,379 | ||||||||
| Total Assets | 105,291 | 96,404 | 105,291 | 96,404 | 94,618 | ||||||
| Corp. & Eliminations | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Revenue | (5,002) | (3,273) | (5,488) | ||||||||
| Gross profit (loss) | (689) | (644) | (853) | ||||||||
| Operating income (loss) | (8,446) | (7,798) | (8,367) | ||||||||
| Depreciation expense | 404 | 421 | 505 | ||||||||
| Capital expenditures | 127 | 806 | 73 | ||||||||
| Total Assets | $ (104,154) | $ (128,216) | (104,154) | $ (128,216) | $ (143,028) | ||||||
| Maximum | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Estimated liquidated damages | $ 11,200 | ||||||||||