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Long-term Incentive Compensation - Additional Information (Detail) - USD ($)
shares in Thousands, $ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Long-term incentive program (LTIP) expense $ 30,946 $ 50,647
Stock-based compensation expense 17,504 23,717
Estimated tax benefits recorded for stock-based compensation 5,912 8,160
Unrecognized compensation cost related to outstanding LTIP awards 149,543  
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under equity compensation and stock purchase plans $ 84,475  
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under performance-based cash component of LTIP costs, weighted average remaining period (in years) 1 year 2 months 12 days  
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under stock-based component of LTIP costs, weighted average remaining period (in years) 1 year 6 months  
Tax benefits from stock award exercises $ 5,693 $ 23,658
Stock Appreciation Rights    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock granted (in shares) 1,426  
Aggregate grant-date fair value $ 20,865  
Weighted-average expected life (in years) 4 years 2 months 12 days  
Restricted Stock Units    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock granted (in shares) 387  
Aggregate grant-date fair value $ 25,517  
Weighted-average expected life (in years) 3 years 4 months 24 days  
Cash Settled Stock Based Awards    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock granted (in shares) 15  
Aggregate grant-date fair value $ 204  
Weighted-average expected life (in years) 4 years 3 months 18 days