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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Statement of Comprehensive Income [Abstract]    
Net income attributable to Biogen Idec Inc. $ 479,956 $ 426,749
Other comprehensive income:    
Unrealized gains (losses) on securities available for sale, net of tax of $1,014 and $654 1,725 (1,117)
Unrealized gains on foreign currency forward contracts, net of tax of $265 and $1,421 5,791 11,603
Unrealized gains on pension benefit obligation 817 1,263
Currency translation adjustment (2,944) (24,419)
Total other comprehensive income (loss), net of tax 5,389 (12,670)
Comprehensive income attributable to Biogen Idec Inc. 485,345 414,079
Comprehensive income (loss) attributable to noncontrolling interests, net of tax (228) 0
Comprehensive income $ 485,117 $ 414,079