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Shareholders' Equity - Summary of Nonvested Share Activity (Detail) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards vested, Number of Shares   (7,260,486)
Supervisory Board [Member] | 2010 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares   22,500
Year of grant 2010  
Exercised   (22,500)
Supervisory Board [Member] | 2011 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 45,000 52,500
Year of grant 2011  
Exercised (37,500) (7,500)
Ending Balance, Number of Shares 7,500 45,000
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  
Exercised (15,000)  
Ending Balance, Number of Shares 50,000 65,000
Employees [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 15,823,673  
Awards granted, Number of Shares 8,034,890  
Awards forfeited/waived, Number of Shares (131,042)  
Awards cancelled on failed vesting conditions, Number of Shares (1,178,979)  
Awards vested, Number of Shares (7,260,486)  
Ending Balance, Number of Shares 15,288,056 15,823,673
Employees [Member] | Employee Plan 2017 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 2,648,379  
Awards forfeited/waived, Number of Shares (14,634)  
Awards cancelled on failed vesting conditions, Number of Shares 0  
Awards vested, Number of Shares (2,633,745)  
Ending Balance, Number of Shares   2,648,379
Employees [Member] | Employee Plan 2018 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 5,197,924  
Awards forfeited/waived, Number of Shares (36,912)  
Awards cancelled on failed vesting conditions, Number of Shares 0  
Awards vested, Number of Shares (2,442,327)  
Ending Balance, Number of Shares 2,718,685 5,197,924
Employees [Member] | 2019 CEO Special Bonus [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards granted, Number of Shares 34,960  
Awards vested, Number of Shares (11,654)  
Ending Balance, Number of Shares 23,306  
Employees [Member] | Employee Plan 2019 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 7,977,370  
Awards forfeited/waived, Number of Shares (51,111)  
Awards cancelled on failed vesting conditions, Number of Shares (1,178,979)  
Awards vested, Number of Shares (2,172,160)  
Ending Balance, Number of Shares 4,575,120 7,977,370
Employees [Member] | Employee Plan 2020 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards granted, Number of Shares 7,999,930  
Awards forfeited/waived, Number of Shares (28,385)  
Awards vested, Number of Shares (600)  
Ending Balance, Number of Shares 7,970,945