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Stock-Based Compensation (Outstanding and Exercisable SARs by Grant Price) (Detail) - Stock Appreciation Rights - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award        
Number of SARs Outstanding at Year End 31,929 40,041 44,129 45,590
Outstanding SARs Weighted-Average Grant Price Per Share $ 17.22 $ 18.3 $ 19.14 $ 19.79
Outstanding Weighted-Average Remaining Contractual Life (in years) 5 years 7 months 6 days      
Number of SARs Exercisable at Year End 21,403      
Exerciseable SARs Weighted-Average Grant Price Per Share $ 15.3 $ 18.28 $ 19.71  
Exercisable Weighted-Average Remaining Contractual Life (in years) 4 years 3 months 18 days      
Under $10.00        
Share-based Compensation Arrangement by Share-based Payment Award        
Number of SARs Outstanding at Year End 1,762      
Outstanding SARs Weighted-Average Grant Price Per Share $ 3.98      
Outstanding Weighted-Average Remaining Contractual Life (in years) 1 year 3 months 18 days      
Number of SARs Exercisable at Year End 1,762      
Exerciseable SARs Weighted-Average Grant Price Per Share $ 3.98      
Exercisable Weighted-Average Remaining Contractual Life (in years) 1 year 3 months 18 days      
$10.01-$20.00        
Share-based Compensation Arrangement by Share-based Payment Award        
Number of SARs Outstanding at Year End 23,899      
Outstanding SARs Weighted-Average Grant Price Per Share $ 16.33      
Outstanding Weighted-Average Remaining Contractual Life (in years) 5 years 3 months 18 days      
Number of SARs Exercisable at Year End 17,650      
Exerciseable SARs Weighted-Average Grant Price Per Share $ 15.71      
Exercisable Weighted-Average Remaining Contractual Life (in years) 4 years 4 months 24 days      
$20.01-$30.00        
Share-based Compensation Arrangement by Share-based Payment Award        
Number of SARs Outstanding at Year End 6,268      
Outstanding SARs Weighted-Average Grant Price Per Share $ 24.31      
Outstanding Weighted-Average Remaining Contractual Life (in years) 7 years 9 months 18 days      
Number of SARs Exercisable at Year End 1,991      
Exerciseable SARs Weighted-Average Grant Price Per Share $ 21.63      
Exercisable Weighted-Average Remaining Contractual Life (in years) 6 years 3 months 18 days