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Property, Plant and Equipment and Leased Facilities and Equipment - Additional Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) ft² a Renewal_options | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Property, Plant and Equipment [Line Items] |  |  |
Depreciation and lease asset amortization | $ 8,617 | $ 9,564 | $ 10,350
Operating lease, right-of-use asset | 1,700 |  |
Current lease liability | $ 600 |  |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | us-gaap:LiabilitiesCurrent |  |
Long-term lease liability | $ 2,000 |  |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | Other noncurrent liabilities |  |
Lease agreement expenses | $ 1,500 | 1,800 | $ 1,900
Operating lease payments | $ 1,800 | $ 2,000 |
Operating lease, term of contract | 4 years |  |
Operating lease, weighted-average discount rate (percentage) | 6.70% |  |
Houston, Texas |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Office space area of leased premises (in sqft or acres) | ft² | 17,000 |  |
Jennings, Louisiana |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Office space area of leased premises (in sqft or acres) | a | 180 |  |
Lease description | During the fourth quarter 2020, we closed our Jennings Yard and do not intend to exercise our renewal options. See Note 3 for discussion of our closure of the Jennings Yard |  |
Jennings, Louisiana | Prospect Shipyard |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Lease renewal options | Renewal_options | 2 |  |
Lease renewal term | 10 years |  |
Lake Charles, Louisiana |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Office space area of leased premises (in sqft or acres) | a | 10 |  |
Lease description | During the fourth quarter 2020, we closed our Lake Charles Yard and do not intend to exercise our renewal options. See Note 3 for discussion of our closure of the Lake Charles Yard |  |
Lake Charles, Louisiana | Prospect Shipyard |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Lease renewal options | Renewal_options | 3 |  |
Lease renewal term | 5 years |  |
Metairie, Louisiana |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Office space area of leased premises (in sqft or acres) | ft² | 7,600 |  |
Lease maturity date | 2025-12 |  |

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