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Transactions with Related Parties, Brokerage Agreement - 20F (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Brokerage Agreement [Abstract] |  |  |
Voyage expenses related parties | $ 0 | $ 24 | $ 313
Safbulk Brokerage Agreement [Member] |  |  |
Brokerage Agreement [Abstract] |  |  |
Brokerage commission | 1.25% |  |
Voyage expenses related parties | $ 0 | $ 24 | $ 313

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- References No definition available. + Details
Name: | ship_BrokerageAgreementAbstract
Namespace Prefix: | ship_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Brokerage commission on hire. + References No definition available. + Details
Name: | ship_BrokerageCommissionPercentage
Namespace Prefix: | ship_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Expenses with related parties primarily consisting of commissions and fees, which are expenses for by the company, regardless of the charter type. + References No definition available. + Details
Name: | ship_VoyageExpensesRelatedParties
Namespace Prefix: | ship_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ship_SafbulkBrokerageAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |