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Transactions with Related Parties, textual 2 (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Remaining commitment for new build | $ 48,155 |
Fair value of newbuild | 46,000 |
Stalo |  |
Property, Plant and Equipment [Line Items] |  |
Vessel agreed sale price |  | $ 9,000
Kypros Unity |  |
Property, Plant and Equipment [Line Items] |  |
Vessel agreed sale price |  | $ 20,000
Asset under Construction |  |
Property, Plant and Equipment [Line Items] |  |
Remaining commitment for new build | 28,400 |
Fair value of newbuild | 26,500 |
Hull No. 835 |  |
Property, Plant and Equipment [Line Items] |  |
Fair value of newbuild | 21,500 |
Hull No. 1551 |  |
Property, Plant and Equipment [Line Items] |  |
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 The agreed sale price which the buyers will pay and which represents the higher of the two appraisals for that vessel obtained from independent third parties. + References No definition available. + Details
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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
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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