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Advances for Vessel Acquisition and Vessels under Construction, detail (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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Namespace Prefix: | sb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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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
Name: | sb_AdvancesPaidCapitalizedExpensesAndInterestAndAccruedVesselCost
Namespace Prefix: | sb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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
Name: | sb_ImpairmentOfAdvancesForVesselUnderConstructionToBeDisposedOf
Namespace Prefix: | sb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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 + Details
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Namespace Prefix: | us-gaap_
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