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Acquisitions - Acquacue. Inc. (Details) (USD $)
0 Months Ended 12 Months Ended
Apr. 01, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Business Acquisition        
Goodwill   47,722,000us-gaap_Goodwill $ 44,695,000us-gaap_Goodwill $ 35,900,000us-gaap_Goodwill
Aquacue        
Business Acquisition        
Percentage acquired 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= bmi_AquacueInc.Member
     
Cash payment 13,800,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= bmi_AquacueInc.Member
     
Deferred acquisition costs 3,000,000bmi_BusinessAcquisitionCostofAcquiredEntityDeferredYearOneandTwo
/ us-gaap_BusinessAcquisitionAxis
= bmi_AquacueInc.Member
     
Current assets     100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= bmi_AquacueInc.Member
 
Deferred tax assets     1,300,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= bmi_AquacueInc.Member
 
Intangible assets     3,900,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= bmi_AquacueInc.Member
 
Goodwill     8,800,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= bmi_AquacueInc.Member
 
Current liabilities     300,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= bmi_AquacueInc.Member
 
Transaction costs     $ 100,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= bmi_AquacueInc.Member
 
Technologies | Aquacue        
Business Acquisition        
Estimated average useful life (in years)   10 years