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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award        
Number of SARs Outstanding at Year End 21,449 26,196 31,929 40,041
Outstanding SARs Weighted-Average Grant Price Per Share $ 18.38 $ 17.30 $ 17.22 $ 18.30
Outstanding Weighted-Average Remaining Contractual Life (in years) 4 years 4 months 24 days      
Number of SARs Exercisable at Year End 18,249      
Exerciseable SARs Weighted-Average Grant Price Per Share $ 17.50 $ 15.90 $ 15.30  
Exercisable Weighted-Average Remaining Contractual Life (in years) 3 years 10 months 24 days      
$10.01-$20.00        
Share-based Compensation Arrangement by Share-based Payment Award        
Number of SARs Outstanding at Year End 15,944      
Outstanding SARs Weighted-Average Grant Price Per Share $ 16.12      
Outstanding Weighted-Average Remaining Contractual Life (in years) 3 years 8 months 12 days      
Number of SARs Exercisable at Year End 14,694      
Exerciseable SARs Weighted-Average Grant Price Per Share $ 16.00      
Exercisable Weighted-Average Remaining Contractual Life (in years) 3 years 6 months      
$20.01-$30.00        
Share-based Compensation Arrangement by Share-based Payment Award        
Number of SARs Outstanding at Year End 5,236      
Outstanding SARs Weighted-Average Grant Price Per Share $ 24.50      
Outstanding Weighted-Average Remaining Contractual Life (in years) 6 years 1 month 6 days      
Number of SARs Exercisable at Year End 3,464      
Exerciseable SARs Weighted-Average Grant Price Per Share $ 23.44      
Exercisable Weighted-Average Remaining Contractual Life (in years) 5 years 3 months 18 days      
$30.01-$40.00        
Share-based Compensation Arrangement by Share-based Payment Award        
Number of SARs Outstanding at Year End 269      
Outstanding SARs Weighted-Average Grant Price Per Share $ 33.15      
Outstanding Weighted-Average Remaining Contractual Life (in years) 8 years      
Number of SARs Exercisable at Year End 91      
Exerciseable SARs Weighted-Average Grant Price Per Share $ 33.15      
Exercisable Weighted-Average Remaining Contractual Life (in years) 7 years 10 months 24 days