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1. Basis of Presentation and Use of Estimates Reclassification R&D Credits (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Research and Development Expense $ 52,543 $ 50,343
Net income attributable to Bio-Rad 6,668 20,151
Income Tax Expense (Benefit) 7,870 3,875
Prior Period Reclassification Adjustment [Member] | Restatement Adjustment [Member]
    
Research and Development Expense   (1,600)
Net income attributable to Bio-Rad   700
Income Tax Expense (Benefit)   $ 900