Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Additional Information (Detail)

v3.6.0.2
Share-Based Compensation - Additional Information (Detail)
12 Months Ended
Dec. 31, 2016
USD ($)
Plan
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of share-based compensation plans | Plan 4    
Common shares authorized under 2014 Stock Incentive Plan | shares 8,700,000    
Common shares remain for future issuance under share-based compensation plans | shares 5,500,000    
Realized income tax benefit for all awards $ 14,800,000 $ 16,600,000 $ 16,600,000
Awards granted | shares 0 0 0
Total vesting date fair value of stock units $ 2,100,000 $ 1,300,000 $ 9,000,000
Reserved for issuance under employee stock purchase plan | shares 2,000,000    
Future issuance of employee stock purchase plan | shares 1,700,000    
Percent of fair market value for which eligible employees can purchase common shares under employee stock purchase plan 85.00%    
Performance conditions [Member] | First Succeeding Year [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards vest, percentage 20.00%    
Performance conditions [Member] | Second Succeeding Year [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards vest, percentage 20.00%    
Performance conditions [Member] | Third Succeeding Year [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards vest, percentage 60.00%    
Independent Director Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period beginning from the grant date 1 year    
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period beginning from the grant date 5 years    
Contractual term 10 years    
SARs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period beginning from the grant date 5 years    
Contractual term 10 years    
Awards granted | shares 0 0 0
SARs [Member] | Incentive Plan Stock Units Other [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period beginning from the grant date 3 years    
Service condition awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 23,900,000 $ 26,800,000 $ 27,900,000
Unrecognized compensation cost on non-vested stock awards $ 31,000,000    
Unrecognized compensation cost on non-vested stock awards, weighted-average period of recognition 1 year 9 months 18 days    
Weighted-average grant date fair value of SARs granted | $ / shares $ 29.33 $ 12.57 $ 25.24
Total intrinsic value of awards exercised for options and SARs $ 32,300,000 $ 25,500,000 $ 63,600,000
Performance condition awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 15,900,000 $ 17,800,000 $ 13,300,000
Unrecognized compensation cost on non-vested stock awards $ 17,100,000    
Unrecognized compensation cost on non-vested stock awards, weighted-average period of recognition 1 year 7 months 6 days    
Weighted-average grant date fair value of SARs granted | $ / shares $ 29.69 $ 13.65 $ 25.98
Total intrinsic value of awards exercised for options and SARs $ 700,000    
Market condition awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 400,000 $ 300,000 $ 0
Unrecognized compensation cost on non-vested stock awards $ 500,000    
Unrecognized compensation cost on non-vested stock awards, weighted-average period of recognition 1 year 2 months 12 days    
Weighted-average grant date fair value of SARs granted | $ / shares   $ 9.87  
Total intrinsic value of awards exercised for options and SARs $ 0 $ 11,400,000 0
Market and performance condition awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 0 $ 0 $ 4,500,000
Management Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Additional awards | shares 0    
2004 Stock Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Additional awards | shares 0    
2005 Stock Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Additional awards | shares 0    
Incentive Plan Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period beginning from the grant date 3 years    
Contractual term 3 years