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Schedule of Indefinite Lived Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Indefinite-lived Intangible Assets [Line Items]    
Net carrying value $ 63,689 $ 70,396
In Process Research And Development | U.S. Marketing Rights For Firdapse
   
Indefinite-lived Intangible Assets [Line Items]    
Net carrying value 0 6,707
In Process Research And Development | BMN-673 acquired through LEAD
   
Indefinite-lived Intangible Assets [Line Items]    
Net carrying value 36,089 36,089
In Process Research And Development | BMN-701 Acquired Through Zystor
   
Indefinite-lived Intangible Assets [Line Items]    
Net carrying value 25,010 25,010
In Process Research And Development | Other Acquired Pre-Clinical Compounds
   
Indefinite-lived Intangible Assets [Line Items]    
Net carrying value $ 2,590 $ 2,590