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10. Comprehensive Income (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Net income including noncontrolling interests $ 40,022,000 $ 38,521,000 $ 72,960,000 $ 73,913,000
Foreign currency translation adjustments 63,300,000 (35,500,000) 84,100,000 (56,300,000)
Net unrealized holding gains (losses) on available-for-sale investments net of tax expense 3,500,000 (7,000,000) 14,100,000 (3,400,000)
Reclassification adjustments for gains included in net income including noncontrolling interests, net of tax expense 0 0 100,000 200,000
Total comprehensive income (loss) 106,800,000 (4,000,000) 171,300,000 14,400,000
Comprehensive loss attributable to noncontrolling interests 200,000 1,100,000 300,000 700,000
Comprehensive income (loss) attributable to Bio-Rad 107,000,000 (2,900,000) 171,600,000 15,100,000
Net unrealized holding gains (losses) on available-for-sale investments, tax 2,000,000 4,100,000 8,200,000 2,000,000
Reclassification adjustments for gains included in net income including noncontrolling interests, tax $ 0 $ 0 $ 100,000 $ 100,000