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2. Acquisitions (Details) (USD $)
3 Months Ended
Jun. 30, 2014
Mar. 31, 2015
Dec. 31, 2014
Apr. 10, 2014
Business Acquisition [Line Items]        
Goodwill   $ 503,422,000us-gaap_Goodwill $ 500,441,000us-gaap_Goodwill  
GnuBIO [Member]        
Business Acquisition [Line Items]        
Indefinite-lived Intangible Assets Acquired 46,400,000us-gaap_IndefinitelivedIntangibleAssetsAcquired
/ us-gaap_BusinessAcquisitionAxis
= bio_GnuBIOMember
     
Business Combination, Consideration Transferred 50,400,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= bio_GnuBIOMember
     
Payments to Acquire Businesses, Gross 39,700,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= bio_GnuBIOMember
     
Business Combination, Contingent Consideration, Liability   9,000,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= bio_GnuBIOMember
  10,700,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= bio_GnuBIOMember
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High       70,000,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= bio_GnuBIOMember
Goodwill       13,500,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= bio_GnuBIOMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net       $ (9,500,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= bio_GnuBIOMember