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15. Quarterly Financial Data (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Quantifying Misstatement in Current Year Financial Statements [Line Items]                      
Net sales $ 573,800,000 $ 498,700,000 $ 510,400,000 $ 486,300,000 $ 550,200,000 $ 516,500,000 $ 521,700,000 $ 485,100,000 $ 2,069,235,000 $ 2,073,529,000 $ 1,927,118,000
Gross profit 314,100,000 273,500,000 287,900,000 278,600,000 311,000,000 296,200,000 293,100,000 277,600,000 1,154,138,000 1,177,889,000 1,091,488,000
Net income attributable to Bio-Rad 42,000,000 42,400,000 48,300,000 31,000,000 59,200,000 45,900,000 40,000,000 33,000,000 163,778,000 178,223,000 185,490,000
Basic earnings per share $ 1.48 $ 1.50 $ 1.71 $ 1.10 $ 2.11 $ 1.63 $ 1.43 $ 1.18 $ 5.79 $ 6.36 $ 6.70
Diluted earnings per share $ 1.46 $ 1.48 $ 1.69 $ 1.09 $ 2.08 $ 1.61 $ 1.41 $ 1.16 $ 5.72 $ 6.26 $ 6.59
2007 through 2011 [Member]
                      
Quantifying Misstatement in Current Year Financial Statements [Line Items]                      
Quantifying Misstatement Amount       $ 6,100,000