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Gain on Asset Purchase Cancelation, textual (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Contract Cancellation [Line Items] |  |  |
(Loss) Gain on asset purchase cancellations | $ 0 | $ 0 | $ 3,633
Contract for Hull No J0131 |  |  |
Contract Cancellation [Line Items] |  |  |
Installments Paid For Vessel Consruction |  | 31,800 |
Accrued Interest Earned Related To Asset Puchase Cancellations |  | $ 4,520 |
Interest rate percentage on advances paid |  | 5.00% |
Interest and expenses capitalized |  | $ 887 |

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- Definition Accrued interest earned related to asset puchase cancellations. + References No definition available. + Details
Name: | sb_AccruedInterestEarnedRelatedToAssetPuchaseCancellations
Namespace Prefix: | sb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition The amount of the installments paid for vessel construction under the shipbuilding contract. + References No definition available. + Details
Name: | sb_InstallmentsPaidForVesselConsruction
Namespace Prefix: | sb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of interest and expense capitalized during the period. + References No definition available. + Details
Name: | sb_InterestAndExpensesCapitalized
Namespace Prefix: | sb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Interest rate percentage on the advances paid computed from the respective dates of the Company's advances in relation to the Shipbuilding contract of Hull J0131 + References No definition available. + Details
Name: | sb_InterestRatePercentageOnAdvancesPaid
Namespace Prefix: | sb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Loss or gain on asset purchase cancellations of newbuild contracts, loss consisting of advances forfeited plus expenses related to the cancellations and gain consisting of accrued interest income earned on the advances paid, net of capitalized expenses. + References No definition available. + Details
Name: | sb_LossGainOnAssetPurchaseCancellations
Namespace Prefix: | sb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | sb_CancellationOfNewbuildContractAxis=sb_ContractForHullNoJ0131Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |