Name:	sb_ContractCancellationLineItems
Namespace Prefix:	sb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The amount of the installments paid for vessel construction under the shipbuilding contract.

No definition available.

Name:	sb_InstallmentsPaidForVesselConsruction
Namespace Prefix:	sb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of interest and expense capitalized during the period.

No definition available.

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

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

No definition available.

Name:	sb_InterestRatePercentageOnAdvancesPaid
Namespace Prefix:	sb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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.

No definition available.