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Discontinued Operations - Narrative (Details) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended
Feb. 04, 2013
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oct. 29, 2012
Sep. 30, 2014
Feb. 01, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Cost-method Investments, Other than Temporary Impairment     $ 2,900,000us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment          
Available-for-sale Securities     26,912,000us-gaap_AvailableForSaleSecurities 9,055,000us-gaap_AvailableForSaleSecurities        
discontinued operations Redeemable preferred stock     143,200,000bth_DiscontinuedoperationsRedeemablepreferredstock 146,603,000bth_DiscontinuedoperationsRedeemablepreferredstock        
redeemable preferred stock shares     38.2bth_Redeemablepreferredstockshares          
Noncontrolling Interest, Ownership Percentage by Parent     10.00%us-gaap_MinorityInterestOwnershipPercentageByParent 80.90%us-gaap_MinorityInterestOwnershipPercentageByParent     10.00%us-gaap_MinorityInterestOwnershipPercentageByParent  
Loss on sale of discontinued operations, net of tax     118,918,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 5,540,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax      
Discontinued Operation, Tax Effect of Discontinued Operation     700,000us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation          
Revenues     138,860,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue 351,187,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue 671,848,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue      
Net working capital adjustment     0us-gaap_ProceedsFromDivestitureOfBusinesses 0us-gaap_ProceedsFromDivestitureOfBusinesses 23,500,000us-gaap_ProceedsFromDivestitureOfBusinesses      
Promissory note received as a consideration of sale     12,014,000us-gaap_NotesReceivableGross          
Proceeds from financing receivable 10,000,000bth_ProceedsFromFinancingReceivable              
Loss on impairment of assets   600,000us-gaap_AssetImpairmentCharges 3,475,000us-gaap_AssetImpairmentCharges 0us-gaap_AssetImpairmentCharges 834,000us-gaap_AssetImpairmentCharges      
Foreign exchange and other, net (1,600,000)us-gaap_OtherNonoperatingIncomeExpense   4,020,000us-gaap_OtherNonoperatingIncomeExpense (72,000)us-gaap_OtherNonoperatingIncomeExpense (691,000)us-gaap_OtherNonoperatingIncomeExpense      
Loans and Leases Receivable, Gross, Consumer, Revolving, Other     15,000,000us-gaap_LoansAndLeasesReceivableConsumerRevolvingOther          
Sterno [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Sale of discontinued operations           23,500,000bth_SaleConsiderationOfDiscontinuedOperations
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= bth_SternoMember		    
Loss on sale of discontinued operations, net of tax       5,500,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= bth_SternoMember		        
Discontinued Operation, Tax Effect of Discontinued Operation           3,100,000us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= bth_SternoMember		    
Subsequent Event [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Short-term Non-bank Loans and Notes Payable               800,000us-gaap_ShortTermNonBankLoansAndNotesPayable
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Chief Operating Officer and interm Chief Financial Officer of ViSalus [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners     2.81%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_BusinessAcquisitionAxis
= bth_ChiefOperatingOfficerandintermChiefFinancialOfficerofViSalusMember		          
Founders [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Loans and Leases Receivable, Gross, Consumer, Revolving, Other     6,000,000us-gaap_LoansAndLeasesReceivableConsumerRevolvingOther
/ us-gaap_BusinessAcquisitionAxis
= bth_FoundersMember		          
Investments [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Notes Receivable, Related Parties, Current     3,800,000us-gaap_NotesReceivableRelatedPartiesCurrent
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_InvestmentsMember		          
Loans and Leases Receivable, Gross, Consumer, Revolving, Other     6,000,000us-gaap_LoansAndLeasesReceivableConsumerRevolvingOther
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_InvestmentsMember		          
Line of Credit Facility, Interest Rate at Period End     10.00%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_InvestmentsMember		          
Notes Receivable, Related Parties     3,000,000us-gaap_NotesReceivableRelatedParties
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_InvestmentsMember		          
Board of Directors Chairman [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners     8.29%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_BoardOfDirectorsChairmanMember		          
President and Chief Executive Officer [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners     0.34%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_BusinessAcquisitionAxis
= bth_PresidentandChiefExecutiveOfficerMember		          
Other Investment [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Available-for-sale Securities     $ 6,850,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bth_OtherInvestmentMember		 $ 0us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bth_OtherInvestmentMember