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Shareholders' Equity - Summary of Nonvested Share Activity (Detail) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards vested, Number of Shares (7,014,570)  
Supervisory Board [Member] | 2008 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares   16,500
Year of grant 2008  
Exercised   (16,500)
Supervisory Board [Member] | 2009 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares   22,500
Year of grant 2009  
Exercised   (22,500)
Supervisory Board [Member] | 2010 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 22,500 30,000
Year of grant 2010  
Exercised (22,500) (7,500)
Ending Balance, Number of Shares   22,500
Supervisory Board [Member] | 2011 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 52,500 52,500
Year of grant 2011  
Exercised (7,500)  
Ending Balance, Number of Shares 45,000 52,500
Supervisory Board [Member] | 2012 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 65,000 65,000
Year of grant 2012  
Ending Balance, Number of Shares 65,000 65,000
Employees [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 15,046,695  
Awards granted, Number of Shares 7,999,690  
Awards forfeited/waived, Number of Shares (208,142)  
Awards cancelled on failed vesting conditions, Number of Shares 0  
Awards vested, Number of Shares (7,014,570)  
Ending Balance, Number of Shares 15,823,673 15,046,695
Employees [Member] | Employee Plan 2016 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 1,804,140  
Awards forfeited/waived, Number of Shares (9,706)  
Awards cancelled on failed vesting conditions, Number of Shares 0  
Awards vested, Number of Shares (1,794,434)  
Ending Balance, Number of Shares   1,804,140
Employees [Member] | Employee Plan 2017 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 5,268,975  
Awards forfeited/waived, Number of Shares (64,290)  
Awards cancelled on failed vesting conditions, Number of Shares 0  
Awards vested, Number of Shares (2,556,306)  
Ending Balance, Number of Shares 2,648,379 5,268,975
Employees [Member] | Employee Plan 2018 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 7,973,580  
Awards forfeited/waived, Number of Shares (111,826)  
Awards cancelled on failed vesting conditions, Number of Shares 0  
Awards vested, Number of Shares (2,663,830)  
Ending Balance, Number of Shares 5,197,924 7,973,580
Employees [Member] | Employee Plan 2019 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards granted, Number of Shares 7,999,690  
Awards forfeited/waived, Number of Shares (22,320)  
Ending Balance, Number of Shares 7,977,370