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Stock-based Compensation Plans - Additional Information 3 (Detail)
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting period   1 year    
Accelerated vesting of equity grants $ 30,800,000   $ 30,800,000  
Unrecognized compensation related to Awards   $ 427,000    
Weighted average period   1 year 8 months 12 days    
Performance-based PG-PSUs and RG-PSUs        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting period   3 years    
Stock-based compensation expense   $ 5,400,000 1,800,000  
Accelerated vesting of equity grants     1,500,000  
Performance Based TSR - PSUs        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting period   3 years    
Stock-based compensation expense   $ 6,300,000 24,800,000 $ 12,400,000
Accelerated vesting of equity grants     $ 13,000,000  
Performance Share        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting period   3 years    
Unrecognized compensation related to Awards   $ 1,100,000    
Weighted average period   1 year 6 months    
Stock Appreciation Rights (SARs)        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock-based compensation expense   $ 0    
Number of awards exercised | shares   0 0 0
Outstanding awards exercisable, exercise price | $ / shares   81.74    
Outstanding awards exercisable, aggregate intrinsic value   $ 0    
Stock Appreciation Rights (SARs) | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Outstanding awards exercisable, weighted average remaining contractual life   1 year