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Share-Based Compensation (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based compensation expense before taxes $ 25,355,000 $ 19,540,000 $ 13,592,000
Excess Tax Benefit from Share-based Compensation, Operating Activities 1,489,000 4,153,000 1,976,000
QIAGEN Amended and Restated 2005 Stock Plan [Member]
      
Vesting period, years (maximum) 10 years    
Common shares reserved and available for issuance under the plan 19,800,000    
Digene Corporation 2007 Plan [Member]
      
Common shares reserved and available for issuance under the plan 100,000    
Stock Options [Member]
      
Stock options, granted 592,829 601,897  
The weighted-average grant-date fair value of options granted during the years $ 4.80 $ 6.49 $ 6.42
Total intrinsic value of options exercised 7,200,000 3,700,000  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 3,500,000    
Recognized weighted average period, years 1 year 7 months 27 days    
Number of shares exercisable, ending balance 4,252,000 5,500,000 6,400,000
Weighted average exercise price exercisable, ending balance $ 13.18 $ 12.37 $ 12.93
Restricted Stock [Member]
      
Vesting period, years (maximum) 10 years    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 67,600,000    
Recognized weighted average period, years 2 years 10 months 8 days    
Pre-vesting forfeitures percentage 7.10%    
Weighted-average grant date fair value of restricted stock units granted $ 15.80    
Total fair value of restricted stock units $ 13,300,000 $ 8,800,000