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Fair Value Measurements - Schedule Of Assets And Liabilities Measured At Fair Value On Recurring Basis (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Cost-method Investments, Other than Temporary Impairment   $ 2,900,000us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment    
Total   21,429,000us-gaap_AssetsFairValueDisclosure 10,106,000us-gaap_AssetsFairValueDisclosure  
Available-for-sale Securities   26,912,000us-gaap_AvailableForSaleSecurities 9,055,000us-gaap_AvailableForSaleSecurities  
Asset Impairment Charges 600,000us-gaap_AssetImpairmentCharges 3,475,000us-gaap_AssetImpairmentCharges 0us-gaap_AssetImpairmentCharges 834,000us-gaap_AssetImpairmentCharges
Certificates of Deposit [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets measured at fair value on a recurring basis   1,101,000us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember		 1,070,000us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember		  
Short-Term Bond Mutual Funds [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets measured at fair value on a recurring basis   18,961,000us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= bth_ShortTermBondMutualFundsMember		 7,985,000us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= bth_ShortTermBondMutualFundsMember		  
Foreign Exchange Forward Contracts [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets measured at fair value on a recurring basis   405,000us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignExchangeForwardMember		 44,000us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignExchangeForwardMember		  
Liabilities measured at fair value on a recurring basis   (8,000)us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignExchangeForwardMember		 (225,000)us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignExchangeForwardMember		  
Deferred Compensation Plan Assets [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets measured at fair value on a recurring basis   962,000us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= bth_DeferredCompensationPlanAssetsMember		 [1] 1,007,000us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= bth_DeferredCompensationPlanAssetsMember		 [1]  
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Total   19,923,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 8,992,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Certificates of Deposit [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets measured at fair value on a recurring basis   0us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 0us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Short-Term Bond Mutual Funds [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets measured at fair value on a recurring basis   18,961,000us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= bth_ShortTermBondMutualFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 7,985,000us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= bth_ShortTermBondMutualFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Foreign Exchange Forward Contracts [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets measured at fair value on a recurring basis   0us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		     
Liabilities measured at fair value on a recurring basis   0us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 0us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Deferred Compensation Plan Assets [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets measured at fair value on a recurring basis   962,000us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= bth_DeferredCompensationPlanAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 1,007,000us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= bth_DeferredCompensationPlanAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [1]  
Significant Other Observable Inputs (Level 2) [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Total   1,506,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 1,114,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		  
Significant Other Observable Inputs (Level 2) [Member] | Certificates of Deposit [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets measured at fair value on a recurring basis   1,101,000us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 1,070,000us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		  
Significant Other Observable Inputs (Level 2) [Member] | Short-Term Bond Mutual Funds [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets measured at fair value on a recurring basis   0us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= bth_ShortTermBondMutualFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 0us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= bth_ShortTermBondMutualFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		  
Significant Other Observable Inputs (Level 2) [Member] | Foreign Exchange Forward Contracts [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets measured at fair value on a recurring basis   405,000us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 44,000us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		  
Liabilities measured at fair value on a recurring basis   (8,000)us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 (225,000)us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		  
Significant Other Observable Inputs (Level 2) [Member] | Deferred Compensation Plan Assets [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets measured at fair value on a recurring basis   0us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= bth_DeferredCompensationPlanAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [1] 0us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= bth_DeferredCompensationPlanAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [1]  
Significant Unobservable Inputs (Level 3) [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Total   0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		  
Significant Unobservable Inputs (Level 3) [Member] | Certificates of Deposit [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets measured at fair value on a recurring basis   0us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		  
Significant Unobservable Inputs (Level 3) [Member] | Short-Term Bond Mutual Funds [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets measured at fair value on a recurring basis   0us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= bth_ShortTermBondMutualFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= bth_ShortTermBondMutualFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		  
Significant Unobservable Inputs (Level 3) [Member] | Foreign Exchange Forward Contracts [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets measured at fair value on a recurring basis   0us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		     
Liabilities measured at fair value on a recurring basis   0us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		  
Significant Unobservable Inputs (Level 3) [Member] | Deferred Compensation Plan Assets [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets measured at fair value on a recurring basis   0us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= bth_DeferredCompensationPlanAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [1] 0us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByAssetClassAxis
= bth_DeferredCompensationPlanAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [1]  
Other Investment [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Available-for-sale Securities   $ 6,850,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bth_OtherInvestmentMember		 $ 0us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bth_OtherInvestmentMember		  
[1] Recorded as an Other asset with an offsetting liability for the obligation to employees in Other liabilities.