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Debt - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Y
Dec. 31, 2012
Y
Dec. 31, 2011
Debt Instrument      
Revolving credit agreement period (in years)   5  
Credit facility maximum borrowing capacity   $ 300  
Credit facility agreement expiration date   Jun. 15, 2017  
Credit facility, number of one-year extensions   2  
Credit facility, duration of extension term (in years)   1  
Credit facility outstanding balance   0  
Credit facility borrowing capacity   300  
Term loan, face amount 300    
Term of loan, years 5    
Repayment terms Term loan is payable in quarterly installments, commencing on June 30, 2012, with all remaining principal due on April 5, 2016.    
Interest rate on term loan   1.25%  
Term loan payable   289  
Interest expenses on borrowing   $ 4 $ 4