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Long-term Incentive Compensation - Additional Information (Detail) - USD ($)
shares in Thousands, $ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Long-term incentive program (LTIP) expense $ 61,042 $ 100,171
Stock-based compensation expense 29,817 42,794
Estimated tax benefits recorded for stock-based compensation 9,769 14,870
Unrecognized compensation cost related to outstanding LTIP awards 108,551  
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under equity compensation and stock purchase plans $ 62,323  
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  
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 4 months 24 days  
Tax benefits from stock award exercises $ 27,012 $ 31,069
Stock Appreciation Rights    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock granted 1,263  
Aggregate grant-date fair value $ 17,373  
Weighted-average expected life (in years) 4 years 2 months 12 days  
Cash Settled Stock Appreciation Rights    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock granted 8  
Cash Settled Restricted Stock Units    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock granted 2  
Stock Settled Restricted Stock Units    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock granted 227  
Aggregate grant-date fair value $ 17,008  
Weighted-average expected life (in years) 3 years 4 months 24 days