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Organization (Details) $ in Thousands	1 Months Ended		12 Months Ended
	Feb. 29, 2016 USD ($)	Feb. 28, 2014 vessel	Dec. 31, 2016 USD ($) segment vessel	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			3
Sale of ownership interest for cash | $			$ 25,000	$ 0	$ 0
Deepwater Gateway, L.L.C. [Member]
Segment Reporting Information [Line Items]
Sale of ownership interest for cash | $	$ 25,000
Robotics [Member]
Segment Reporting Information [Line Items]
Number of chartered vessels			3
Q5000 [Member]
Segment Reporting Information [Line Items]
Term of contract			5 years
Monohull Vessels [Member]
Segment Reporting Information [Line Items]
Number of chartered vessels		2
Monohull Vessels [Member] | Well Intervention [Member]
Segment Reporting Information [Line Items]
Number of chartered vessels			2

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Number Of Chartered Vessels

+ References

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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