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Advances for Vessel Acquisition and Vessels under Construction, detail (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Advances For Assets Acquisition And Assets Under Construction
Advances for vessel acquisition and vessels under construction, Beginning balance	$ 68,356	$ 74,243
Advances paid, including capitalized expense and interest	61,857	123,560
Impairment loss	(17,163)	(9,927)
Transferred to vessel cost	(100,043)	(119,520)
Advances for vessel acquisition and vessels under construction, Closing balance	$ 13,007	$ 68,356

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- Definition

Gross amount, at the balance sheet date, of long-lived assets under construction that include construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service and advances and costs paid for assets under acquisition that have not been completed and delivered and not ready to be placed into service as at the balance sheet date.

+ References

No definition available.

+ Details

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Balance Type:	debit
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- References

No definition available.

+ Details

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- Definition

Payments of installments associated with acquisition of vessels including advances paid for vessels under construction and certain capitalized expenses, interest and accrued vessel cost.

+ References

No definition available.

+ Details

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Namespace Prefix:	sb_
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Balance Type:	debit
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- Definition

The aggregate amount of write-downs for impairments recognized during the period for advances for vessels under construction for novation, abandonment, exchange or sale.

+ References

No definition available.

+ Details

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- Definition

Amount of increase (decrease) of physical assets used in the normal conduct of business and not intended for resale, from reclassification, impairment, donation, or changes classified as other. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2921-110230

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