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Summary of Total Revenues from External Customers and Collaborative Partners by Geographic Region (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenue from External Customer [Line Items]      
Total revenues $ 751,040us-gaap_Revenues $ 548,485us-gaap_Revenues $ 500,723us-gaap_Revenues
UNITED STATES      
Revenue from External Customer [Line Items]      
Total revenues 380,044us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
284,303us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
249,744us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
Europe      
Revenue from External Customer [Line Items]      
Total revenues 139,940us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
115,729us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
109,865us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
Latin America      
Revenue from External Customer [Line Items]      
Total revenues 118,562us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaMember
67,339us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaMember
74,390us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaMember
Rest of World      
Revenue from External Customer [Line Items]      
Total revenues $ 112,494us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= bmrn_RestOfWorldMember
$ 81,114us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= bmrn_RestOfWorldMember
$ 66,724us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= bmrn_RestOfWorldMember