XML 125 R71.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Transactions with Related Parties, Vessel Acquisitions - 6K (Details) |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 06, 2015 Vessel | Sep. 30, 2016 t | Dec. 31, 2015 Vessel t
Vessel Acquisitions [Abstract] |  |  |
Number of vessels acquired | Vessel |  |  | 8
Drybulk Vessel [Member] |  |  |
Vessel Acquisitions [Abstract] |  |  |
Number of vessels acquired | Vessel | 7 |  |
Capesize Vessel [Member] |  |  |
Vessel Acquisitions [Abstract] |  |  |
Number of vessels acquired | Vessel | 5 |  |
Supramax Vessel [Member] |  |  |
Vessel Acquisitions [Abstract] |  |  |
Number of vessels acquired | Vessel | 2 |  |
Premiership [Member] |  |  |
Vessel Acquisitions [Abstract] |  |  |
Date of delivery |  | Sep. 11, 2015 | Sep. 11, 2015
Vessel class |  | Capesize | Capesize
Dead weight tonnage |  | 170,024 | 170,024
Year built |  | 2010 | 2010
Gladiatorship [Member] |  |  |
Vessel Acquisitions [Abstract] |  |  |
Date of delivery |  | Sep. 29, 2015 | Sep. 29, 2015
Vessel class |  | Supramax | Supramax
Dead weight tonnage |  | 56,819 | 56,819
Year built |  | 2010 | 2010
Geniuship [Member] |  |  |
Vessel Acquisitions [Abstract] |  |  |
Date of delivery |  | Oct. 13, 2015 | Oct. 13, 2015
Vessel class |  | Capesize | Capesize
Dead weight tonnage |  | 170,057 | 170,057
Year built |  | 2010 | 2010
Guardianship [Member] |  |  |
Vessel Acquisitions [Abstract] |  |  |
Date of delivery |  | Oct. 21, 2015 | Oct. 21, 2015
Vessel class |  | Supramax | Supramax
Dead weight tonnage |  | 56,884 | 56,884
Year built |  | 2011 | 2011
Gloriuship [Member] |  |  |
Vessel Acquisitions [Abstract] |  |  |
Date of delivery |  | Nov. 03, 2015 | Nov. 03, 2015
Vessel class |  | Capesize | Capesize
Dead weight tonnage |  | 171,314 | 171,314
Year built |  | 2004 | 2004
Squireship [Member] |  |  |
Vessel Acquisitions [Abstract] |  |  |
Date of delivery |  | Nov. 10, 2015 | Nov. 10, 2015
Vessel class |  | Capesize | Capesize
Dead weight tonnage |  | 170,018 | 170,018
Year built |  | 2010 | 2010
Championship [Member] |  |  |
Vessel Acquisitions [Abstract] |  |  |
Date of delivery |  | Dec. 07, 2015 | Dec. 07, 2015
Vessel class |  | Capesize | Capesize
Dead weight tonnage |  | 179,238 | 179,238
Year built |  | 2011 | 2011

X
- Definition Date the vessel was delivered to the entity. + References No definition available. + Details
Name: | ship_DateOfDelivery
Namespace Prefix: | ship_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Deadweight tonnage (DWT) is a measure of vessels capacity in weight, and does not include the weight of the vessel. + References No definition available. + Details
Name: | ship_DeadWeightTonnage
Namespace Prefix: | ship_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of vessels acquired during the period. + References No definition available. + Details
Name: | ship_NumberOfVesselsAcquired
Namespace Prefix: | ship_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the class of vessel. + References No definition available. + Details
Name: | ship_VesselClass
Namespace Prefix: | ship_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the year built. + References No definition available. + Details
Name: | ship_YearBuilt
Namespace Prefix: | ship_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentOwnedNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=ship_DryBulkVesselMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=ship_CapesizeVesselMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=ship_SupramaxVesselMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=ship_PremiershipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=ship_GladiatorshipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=ship_GeniushipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=ship_GuardianshipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=ship_GloriushipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=ship_SquireshipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=ship_ChampionshipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |