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Commitments and Contingencies, detail (Details) $ in Thousands	Dec. 31, 2016 USD ($) item
Commitments And Contingencies Disclosure
Number Of Moas | item	3
Number Of Newbuild Vessels | item	2
Sales effect on commitments	$ 20,510
Unrecorded Unconditional Purchase Obligation [Line Items]
2017	48,988
2018	22,384
Total	71,372
Due To Shipyards Sellers
Unrecorded Unconditional Purchase Obligation [Line Items]
2017	47,869
2018	21,771
Total	69,640
Due To Manager
Unrecorded Unconditional Purchase Obligation [Line Items]
2017	1,119
2018	613
Total	$ 1,732

X

- Definition

Number of Memorandums of Agreement(MoA)

+ References

No definition available.

+ Details

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X

- Definition

Number of newbuild vessels scheduled to be acquired as of period end.

+ References

No definition available.

+ Details

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Namespace Prefix:	sb_
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- References

No definition available.

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- Definition

Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=73718637&loc=d3e25336-109308

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- Definition

Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=73718637&loc=d3e25336-109308

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- Definition

Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=73718637&loc=d3e25336-109308

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Period Type:	instant

X

- Definition

Amount of change that payments under a contractual obligation might vary as facts and circumstances change.

+ References

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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.

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