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Transactions with Related Parties, Sale of Vessel (Details) - Asset under Construction $ in Thousands | Dec. 31, 2016 USD ($)
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Property, Plant and Equipment [Line Items] |
Remaining commitment for new build | $ 20,510
Fair value of newbuild | $ 24,500

X
- Definition The fair value of a newbuild vessel representing the higher of the two appraisals obtained from independent third parties. + References No definition available. + Details
Name: | sb_FairValueOfCommitmentForNewbuild
Namespace Prefix: | sb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of the remaining commitment maturing in the remainder of the fiscal years in order to complete a newbuild vessel as of the day of signing the novation agreement. + References No definition available. + Details
Name: | sb_RemainingCommitmentForNewBuild
Namespace Prefix: | sb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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