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Long Term Debt (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Series A Notes
   
Debt Instrument [Line Items]    
Principal amount $ 35 $ 35
Senior long-term notes, interest rate 6.07% 6.07%
Maturity date Mar. 25, 2013  
Series B Notes
   
Debt Instrument [Line Items]    
Principal amount 30  
Senior long-term notes, interest rate 6.28%  
Maturity date Mar. 25, 2014  
Series C Notes
   
Debt Instrument [Line Items]    
Principal amount 35  
Senior long-term notes, interest rate 6.49%  
Maturity date Mar. 25, 2015  
Term Loan
   
Debt Instrument [Line Items]    
Principal amount 150  
Term Loan principal payments plus accrued interest payable, quarterly $ 7.5  
Eurodollar Rate plus the applicable percentage 1.25%  
Maturity date Mar. 26, 2013