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Commitments and Contingencies - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) vessel | Jun. 30, 2019 USD ($) vessel | Dec. 31, 2018 USD ($) vessel | Mar. 31, 2018 vessel
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Number of multi-purpose service vessels | vessel | 2 | 2 | 2 | 2
Net contract asset | $ 12.5 | $ 12.5 | $ 12.5 |
Operating lease, term of contract | 15 years 11 months 16 days | 15 years 11 months 16 days |  |
Operating lease, weighted-average discount rate (percentage) | 7.50% | 7.50% |  |
Operating lease payments | $ 0.2 | $ 0.3 |  |

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