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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

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- Definition Construction In Progress, Number Of Multi-Purpose Service Vessels + References No definition available. + Details
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- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349 + Details
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