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Receivables Schedule of Financing Receivable Credit Quality Indicators (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Loan To Value Ratio Above Fifty Percent [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance segment secured loans $ 329,135bid_SecuredLoans
/ bid_AccountsNotesLoansAndFinanceReceivableRatioTypeAxis
= bid_LoanToValueRatioAboveFiftyPercentMember		 $ 181,027bid_SecuredLoans
/ bid_AccountsNotesLoansAndFinanceReceivableRatioTypeAxis
= bid_LoanToValueRatioAboveFiftyPercentMember
Low auction estimate of collateral 556,662bid_AuctionEstimateOfCollateralRelatedToSecuredLoan
/ bid_AccountsNotesLoansAndFinanceReceivableRatioTypeAxis
= bid_LoanToValueRatioAboveFiftyPercentMember		 295,255bid_AuctionEstimateOfCollateralRelatedToSecuredLoan
/ bid_AccountsNotesLoansAndFinanceReceivableRatioTypeAxis
= bid_LoanToValueRatioAboveFiftyPercentMember
Aggregate LTV ratio of Finance segment secured loans 59.00%bid_RatioOfPrincipalValueOfLoanReceivableToAuctionEstimatesOfCollateral
/ bid_AccountsNotesLoansAndFinanceReceivableRatioTypeAxis
= bid_LoanToValueRatioAboveFiftyPercentMember		 61.00%bid_RatioOfPrincipalValueOfLoanReceivableToAuctionEstimatesOfCollateral
/ bid_AccountsNotesLoansAndFinanceReceivableRatioTypeAxis
= bid_LoanToValueRatioAboveFiftyPercentMember
Finance [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance segment secured loans 644,441bid_SecuredLoans
/ us-gaap_StatementBusinessSegmentsAxis
= bid_FinanceMember		 474,433bid_SecuredLoans
/ us-gaap_StatementBusinessSegmentsAxis
= bid_FinanceMember
Low auction estimate of collateral $ 1,349,094bid_AuctionEstimateOfCollateralRelatedToSecuredLoan
/ us-gaap_StatementBusinessSegmentsAxis
= bid_FinanceMember		 $ 1,180,406bid_AuctionEstimateOfCollateralRelatedToSecuredLoan
/ us-gaap_StatementBusinessSegmentsAxis
= bid_FinanceMember
Aggregate LTV ratio of Finance segment secured loans 48.00%bid_RatioOfPrincipalValueOfLoanReceivableToAuctionEstimatesOfCollateral
/ us-gaap_StatementBusinessSegmentsAxis
= bid_FinanceMember		 40.00%bid_RatioOfPrincipalValueOfLoanReceivableToAuctionEstimatesOfCollateral
/ us-gaap_StatementBusinessSegmentsAxis
= bid_FinanceMember