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15. Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Data [Abstract]                      
Net sales $ 570,600 $ 470,000 $ 506,100 $ 472,800 $ 598,200 $ 530,600 $ 536,800 $ 509,300 $ 2,019,441 $ 2,175,044 $ 2,132,694
Gross profit 308,500 263,500 279,600 270,100 317,400 288,600 297,200 275,300 1,121,670 1,178,517 1,178,478
Net income attributable to Bio-Rad $ 49,500 $ 17,400 $ 28,400 $ 17,800 $ 39,000 $ 11,500 $ 31,600 $ 6,700 $ 113,093 $ 88,845 $ 77,790
Basic earnings per share $ 1.69 $ 0.59 $ 0.98 $ 0.61 $ 1.35 $ 0.40 $ 1.10 $ 0.23 $ 3.87 $ 3.08 $ 2.72
Diluted earnings per share $ 1.68 $ 0.59 $ 0.97 $ 0.61 $ 1.34 $ 0.39 $ 1.09 $ 0.23 $ 3.85 $ 3.05 $ 2.69