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Long-Term Incentive Plans (Stock Options Outstanding) (Detail) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Shares, Outstanding at beginning of year 7,044,820 6,425,073 6,650,947 7,044,820
Number of Shares, Granted 1,100,000     1,100,000
Number of Shares, Expired or canceled   (461,805) (225,874) (1,493,873)
Number of Shares, Outstanding at end of year   5,963,268 6,425,073 6,650,947
Number of Shares, Exercisable at end of year   1,751,173 2,211,878 2,050,252
Outstanding at beginning of year, Weighted Average Price per Share $ 25.3110 $ 21.3330 $ 22.1713 $ 25.3110
Granted, Weighted Average Price per Share       $ 5.0500
Expired or canceled, Weighted Average Price per Share   $ 50.8330 $ 46.0164 $ 24.3703
Outstanding at end of year, Weighted Average Price per Share   $ 19.0485 $ 21.3330 $ 22.1713
Exercisable at end of year, Weighted Average Price per Share $ 5.05 $ 45.0174 $ 46.1478 $ 53.1172
Weighted average fair value per share of options granted during the year, Weighted Avg. Price per Share       $ 3.79