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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Supplementary Information [Line Items]        
Stock-based compensation costs $ 6.1 $ 7.3 $ 41.0 $ 44.5
Interest income 1.4 1.4 2.8 2.9
Venezuela foreign exchange-related charges 9.6   13.6 29.0
Venezuela
       
Supplementary Information [Line Items]        
Foreign currency exchange for remeasuring Venezuela financial statements 6.30   6.30  
Net monetary assets $ 121   $ 121  
Venezuela | SICAD
       
Supplementary Information [Line Items]        
Foreign currency exchange rate     10.6  
Venezuela | SICAD-II
       
Supplementary Information [Line Items]        
Foreign currency exchange rate     50.0