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Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2014
Mar. 10, 2014
Land Improvements    
Business Acquisition [Line Items]    
Estimated useful lives 10 years  
San Rafael Corporate Center    
Business Acquisition [Line Items]    
Building and improvements   94,414us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ us-gaap_BusinessAcquisitionAxis
= bmrn_SanRafaelCorporateCenterMember
Land   14,565us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ us-gaap_BusinessAcquisitionAxis
= bmrn_SanRafaelCorporateCenterMember
Land improvements   3,616us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= bmrn_SanRafaelCorporateCenterMember
Intangible assets   3,905us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= bmrn_SanRafaelCorporateCenterMember
Total identifiable net assets   116,500us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= bmrn_SanRafaelCorporateCenterMember
Estimated useful lives Remaining lease terms  
San Rafael Corporate Center | Building and Improvements    
Business Acquisition [Line Items]    
Estimated useful lives   50 years
San Rafael Corporate Center | Land Improvements    
Business Acquisition [Line Items]    
Estimated useful lives   10 years