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Property, Plant and Equipment and Leased Facilities and Equipment - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) ft² a Renewal_options | Dec. 31, 2019 USD ($) ft² a Renewal_options | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2019 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |
Depreciation and lease asset amortization |  | $ 9,564 | $ 10,350 | $ 12,745 |
Operating lease, right-of-use asset | $ 1,900 | 1,900 |  |  |
Present value of lease liabilities | 2,595 | 2,595 |  |  |
Decrease in operating lease assets | 2,500 |  |  |  |
Decrease in operating lease liabilities | 2,500 |  |  |  |
Current lease liability | 500 | 500 |  |  |
Long-term lease liability | $ 2,100 | 2,100 |  |  |
Lease agreement expenses |  | 1,800 | $ 1,900 | $ 2,000 |
Operating lease payments |  | $ 2,000 |  |  |
Operating lease, term of contract | 4 years 7 months 6 days | 4 years 7 months 6 days |  |  |
Operating lease, weighted-average discount rate (percentage) | 6.75% | 6.75% |  |  |
Houston, Texas |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Office space area of leased premises (in sqft or acres) | ft² | 17,000 | 17,000 |  |  |
Jennings, Louisiana |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Office space area of leased premises (in sqft or acres) | a | 180 | 180 |  |  |
Jennings, Louisiana | Prospect Shipyard |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Lease renewal options | Renewal_options | 2 | 2 |  |  |
Lease renewal term | 10 years | 10 years |  |  |
Lake Charles, Louisiana |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Office space area of leased premises (in sqft or acres) | a | 10 | 10 |  |  |
Lake Charles, Louisiana | Prospect Shipyard |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Lease renewal options | Renewal_options | 3 | 3 |  |  |
Lease renewal term | 5 years | 5 years |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Operating lease, right-of-use asset |  |  |  |  | $ 7,100
Present value of lease liabilities |  |  |  |  | 5,200
Accounting Standards Update 2016-02 | Off-Market Favorable Lease |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Operating lease, right-of-use asset |  |  |  |  | $ 1,900

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