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Fair Value Measurement - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Minimum
Dec. 31, 2012
Maximum
Dec. 31, 2011
Zero-Coupon Government Bonds
Quoted Prices In Active Markets (Level 1)
Dec. 31, 2011
Zero-Coupon Government Bonds
Significant Other Observable Inputs (Level 2)
Fair Value Measurements [Line Items]          
Net asset value per share $ 1.00        
Fair value of financial asset       $ 9.6 $ 0.9
Fair value of contingent consideration liability associated with future milestone   7.0 94.4    
Contingent consideration 51.2        
Current contingent consideration 23.7        
Other liabilities $ 27.5