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Acquisitions - National Meter (Details) (USD $)
0 Months Ended 3 Months Ended
Oct. 01, 2014
Mar. 31, 2015
Dec. 31, 2014
Business Acquisition      
Goodwill   47,712,000us-gaap_Goodwill $ 47,722,000us-gaap_Goodwill
National Meter and Automation, Inc.      
Business Acquisition      
Percentage acquired 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= bmi_NationalMeterandAutomationInc.Member
   
Incremental revenue 15,000,000bmi_BusinessCombinationsIncrementalRevenue
/ us-gaap_BusinessAcquisitionAxis
= bmi_NationalMeterandAutomationInc.Member
   
Total purchase consideration 22,900,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= bmi_NationalMeterandAutomationInc.Member
   
Cash payment 20,300,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= bmi_NationalMeterandAutomationInc.Member
   
Deferred payments     2,500,000bmi_BusinessCombinationDeferredPaymentsLiability
/ us-gaap_BusinessAcquisitionAxis
= bmi_NationalMeterandAutomationInc.Member
Receivables     3,900,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= bmi_NationalMeterandAutomationInc.Member
Inventory     4,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= bmi_NationalMeterandAutomationInc.Member
Property, plant and equipment     2,800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= bmi_NationalMeterandAutomationInc.Member
Intangibles     9,800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= bmi_NationalMeterandAutomationInc.Member
Goodwill     3,000,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= bmi_NationalMeterandAutomationInc.Member
Current liabilities     100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= bmi_NationalMeterandAutomationInc.Member
Accounts Payable | National Meter and Automation, Inc.      
Business Acquisition      
Deferred payments     2,000,000bmi_BusinessCombinationDeferredPaymentsLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccountsPayableMember
/ us-gaap_BusinessAcquisitionAxis
= bmi_NationalMeterandAutomationInc.Member
Long-term Debt | National Meter and Automation, Inc.      
Business Acquisition      
Deferred payments     $ 500,000bmi_BusinessCombinationDeferredPaymentsLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LongTermDebtMember
/ us-gaap_BusinessAcquisitionAxis
= bmi_NationalMeterandAutomationInc.Member
Customer relationships | National Meter and Automation, Inc.      
Business Acquisition      
Estimated average useful life (in years)   12 years