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15. Quarterly Financial Data (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Quarterly Financial Data [Abstract]                      
Net sales $ 598,200us-gaap_SalesRevenueNet $ 530,600us-gaap_SalesRevenueNet $ 536,800us-gaap_SalesRevenueNet $ 509,300us-gaap_SalesRevenueNet $ 602,600us-gaap_SalesRevenueNet $ 505,100us-gaap_SalesRevenueNet $ 525,300us-gaap_SalesRevenueNet $ 499,700us-gaap_SalesRevenueNet $ 2,175,044us-gaap_SalesRevenueNet $ 2,132,694us-gaap_SalesRevenueNet $ 2,069,235us-gaap_SalesRevenueNet
Gross profit 317,400us-gaap_GrossProfit 288,600us-gaap_GrossProfit 297,200us-gaap_GrossProfit 275,300us-gaap_GrossProfit 322,700us-gaap_GrossProfit 284,200us-gaap_GrossProfit 300,100us-gaap_GrossProfit 271,400us-gaap_GrossProfit 1,178,517us-gaap_GrossProfit 1,178,478us-gaap_GrossProfit 1,155,158us-gaap_GrossProfit
Net income attributable to Bio-Rad $ 39,000us-gaap_NetIncomeLoss $ 11,500us-gaap_NetIncomeLoss $ 31,600us-gaap_NetIncomeLoss $ 6,700us-gaap_NetIncomeLoss $ 30,100us-gaap_NetIncomeLoss $ (7,100)us-gaap_NetIncomeLoss $ 34,600us-gaap_NetIncomeLoss $ 20,200us-gaap_NetIncomeLoss $ 88,845us-gaap_NetIncomeLoss $ 77,790us-gaap_NetIncomeLoss $ 165,477us-gaap_NetIncomeLoss
Basic earnings per share $ 1.35us-gaap_EarningsPerShareBasic $ 0.40us-gaap_EarningsPerShareBasic $ 1.10us-gaap_EarningsPerShareBasic $ 0.23us-gaap_EarningsPerShareBasic $ 1.05us-gaap_EarningsPerShareBasic $ (0.25)us-gaap_EarningsPerShareBasic $ 1.21us-gaap_EarningsPerShareBasic $ 0.71us-gaap_EarningsPerShareBasic $ 3.08us-gaap_EarningsPerShareBasic $ 2.72us-gaap_EarningsPerShareBasic $ 5.85us-gaap_EarningsPerShareBasic
Diluted earnings per share $ 1.34us-gaap_EarningsPerShareDiluted $ 0.39us-gaap_EarningsPerShareDiluted $ 1.09us-gaap_EarningsPerShareDiluted $ 0.23us-gaap_EarningsPerShareDiluted $ 1.04us-gaap_EarningsPerShareDiluted $ (0.25)us-gaap_EarningsPerShareDiluted $ 1.20us-gaap_EarningsPerShareDiluted $ 0.70us-gaap_EarningsPerShareDiluted $ 3.05us-gaap_EarningsPerShareDiluted $ 2.69us-gaap_EarningsPerShareDiluted $ 5.78us-gaap_EarningsPerShareDiluted