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Revenue and Credit Concentrations - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Concentration Risk [Line Items]      
Number of customers accounted for largest balance in accounts receivable 2bmrn_NumberOfCustomersAccountedForLargestBalanceInAccountReceivable 2bmrn_NumberOfCustomersAccountedForLargestBalanceInAccountReceivable  
Accounts receivable, net 144,472,000us-gaap_AccountsReceivableNetCurrent 117,822,000us-gaap_AccountsReceivableNetCurrent  
Total amount past due 11,400,000us-gaap_FinancingReceivableRecordedInvestmentPastDue    
Greater than 90 days      
Concentration Risk [Line Items]      
Total amount past due 400,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ bmrn_ScheduleOfAccountsNotesLoansAndFinancingReceivableByPastDueDaysAxis
= bmrn_GreaterThanNinetyDaysMember
   
Greater than 180 days      
Concentration Risk [Line Items]      
Total amount past due 300,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ bmrn_ScheduleOfAccountsNotesLoansAndFinancingReceivableByPastDueDaysAxis
= bmrn_GreaterThanOneHundredAndEightyDaysMember
   
Greater than 365 days      
Concentration Risk [Line Items]      
Total amount past due 18,000,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ bmrn_ScheduleOfAccountsNotesLoansAndFinancingReceivableByPastDueDaysAxis
= bmrn_GreaterThanThreeHundredAndSixtyFiveDaysMember
   
Accounts Receivable | Southern European Countries      
Concentration Risk [Line Items]      
Concentration risk, percentage 8.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_StatementGeographicalAxis
= bmrn_SouthernEuropeanCountriesMember
   
Net Product Revenue | Southern European Countries      
Concentration Risk [Line Items]      
Concentration risk, percentage 4.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_StatementGeographicalAxis
= bmrn_SouthernEuropeanCountriesMember
   
Customer Concentration Risk | Customer A      
Concentration Risk [Line Items]      
Accounts receivable, net 34,500,000us-gaap_AccountsReceivableNetCurrent
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= bmrn_CustomerOneMember
26,300,000us-gaap_AccountsReceivableNetCurrent
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= bmrn_CustomerOneMember
 
Customer Concentration Risk | Accounts Receivable | Customer A      
Concentration Risk [Line Items]      
Concentration risk, percentage 42.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= bmrn_CustomerOneMember
45.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= bmrn_CustomerOneMember
 
Customer Concentration Risk | Accounts Receivable | Customer B      
Concentration Risk [Line Items]      
Concentration risk, percentage 18.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= bmrn_CustomerTwoMember
15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= bmrn_CustomerTwoMember
 
Customer Concentration Risk | Net Product Revenue      
Concentration Risk [Line Items]      
Concentration risk, percentage 52.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
51.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
52.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
Customer Concentration Risk | Net Product Revenue | Customer A      
Concentration Risk [Line Items]      
Concentration risk, percentage 15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= bmrn_CustomerOneMember
15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= bmrn_CustomerOneMember
15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= bmrn_CustomerOneMember
Customer Concentration Risk | Net Product Revenue | Customer B      
Concentration Risk [Line Items]      
Concentration risk, percentage 14.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= bmrn_CustomerTwoMember
[1] 16.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= bmrn_CustomerTwoMember
[1] 16.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= bmrn_CustomerTwoMember
[1]
[1] Genzyme is the Company’s sole customer for Aldurazyme and is responsible for marketing and selling Aldurazyme to third-parties. Net product revenues from Genzyme are comprised of royalties on worldwide net Aldurazyme sales and incremental product transfer revenue.