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v3.8.0.1

Company Overview (Details) |  | 9 Months Ended
--- | --- | ---
Feb. 01, 2017 | Sep. 30, 2017 segment vessel
Segment Reporting Information [Line Items] |  |
Number of reportable segments | segment |  | 3
Well Intervention [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of chartered vessels |  | 2
Robotics [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of chartered vessels |  | 4
HFRS [Member] | Production Facilities [Member] |  |
Segment Reporting Information [Line Items] |  |
Contract extension period | 1 year |

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- Definition The duration period by which the contract is extended. + References No definition available. + Details
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- Definition Number Of Chartered Vessels + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition 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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |