Commitments and Contingencies - Narrative (Details) $ in Millions |
Mar. 31, 2018
USD ($)
vessel
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|---|---|
| Commitments and Contingencies Disclosure [Abstract] | |
| Number of multi-purpose service vessels | vessel | 2 |
| Balance sheet exposure | $ | $ 12 |
| X | ||||||||||
- Definition Construction In Progress, Number Of Multi-Purpose Service Vessels No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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