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Information Related To Stock Option Activity (Detail) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2011
Sep. 30, 2012
Dec. 31, 2011
Number Of Shares Underlying Options      
Outstanding at January 1, 2012 (shares)   1,051  
Exercised (shares)   (322)  
Outstanding and exercisable at September 30, 2012 (shares)   729  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Exercised (usd per share)   $ 6.53  
Outstanding and exercisable at September 30, 2012 (usd per share)   $ 11.31  
Weighted Average Contract Life in Years      
Weighted Average Contract Life in Years, Outstanding at January 1, 2012   1 year 4 months 28 days  
Weighted Average Contract Life in Years, Outstanding September 30, 2012   11 months 16 days  
Aggregate Intrinsic Value      
Outstanding at January 1, 2012   $ 13,000,000 [1]  
Outstanding and exercisable at September 30, 2012   6,000,000 [1]  
Stock Options
     
Aggregate Intrinsic Value      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized   0  
Recognized reductions in tax benefits $ 0 $ 1,000,000 $ 3,000,000
[1] The intrinsic value of a stock option is the amount by which the current market value or the market value upon exercise of the underlying stock exceeds the exercise price of the option.