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Long-Term Incentive Plans (Stock Options Outstanding) (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Long-Term Incentive Plans [Abstract]      
Number of shares, outstanding at beginning of year 237,800 2,325,300 2,548,000
Stock option awards exercised (200,000) (2,050,000) 0
Options expired or canceled (37,800) (37,500) (222,700)
Number of shares, outstanding at end of year 0 237,800 2,325,300
Number of shares, exercisable at end of year 0 237,800 2,325,300
Outstanding at beginning of year, weighted average price per share $ 14.6689 $ 6.3703 $ 10.9888
Exercised, weighted average price per share 5.05 4.4722 0
Expired or canceled, weighted average price per share 65.5624 57.51 59.2118
Outstanding at end of year, weighted average price per share 0 14.6689 6.3703
Exercisable at end of year, weighted average price per share $ 0 $ 14.6689 $ 6.3703