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Share-based Compensation - Summary of Stock-based Compensation Activity (Detail) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Options - Exercised (200) (200) (3,300)
Options - Outstanding at end of period 6,600    
Restricted Stock      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted average fair value on date of grant - Outstanding at beginning of period $ 75.32    
Weighted average fair value on date of grant - Granted 44.69    
Weighted average fair value on date of grant - Exercised 0    
Weighted average fair value on date of grant - Vested 69.57    
Weighted average fair value on date of grant - Forfeited 66.98    
Weighted average fair value on date of grant - Outstanding at end of period $ 61.93 $ 75.32  
Awards - Outstanding at beginning of period 2,820    
Awards - Granted 1,661    
Awards - Exercised 0    
Awards - Vested (833)    
Awards - Forfeited (547)    
Awards - Outstanding at end of period 3,101 2,820  
Vesting period from date of grant, in years 3 years    
Stock Options      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted average exercise price per share - Outstanding at beginning of period $ 67.77    
Weighted average exercise price per share - Granted 44.60    
Weighted average exercise price per share - Exercised 53.43    
Weighted average exercise price per share - Vested 0    
Weighted average exercise price per share - Forfeited 55.00    
Weighted average exercise price per share - Outstanding at end of period $ 67.15 $ 67.77  
Options - Outstanding at beginning of period 6,911    
Options - Granted 824    
Options - Exercised (227)    
Options - Vested 0    
Options - Forfeited (916)    
Options - Outstanding at end of period 6,592 6,911  
Vesting period from date of grant, in years 3 years    
Performance Share Units      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted average fair value on date of grant - Outstanding at beginning of period $ 89.43    
Weighted average fair value on date of grant - Granted 50.94    
Weighted average fair value on date of grant - Exercised 0    
Weighted average fair value on date of grant - Vested 111.49    
Weighted average fair value on date of grant - Forfeited 65.11    
Weighted average fair value on date of grant - Outstanding at end of period $ 69.68 $ 89.43  
Awards - Outstanding at beginning of period 820    
Awards - Granted 447    
Awards - Exercised 0    
Awards - Vested (193)    
Awards - Forfeited (59)    
Awards - Outstanding at end of period 1,015 820  
Vesting period from date of grant, in years 3 years