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Shareholders' Equity - Summary of Nonvested Share Activity (Detail) - shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards vested, Number of Shares (4,810,667)  
Employees [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 11,691,007  
Awards granted, Number of shares 7,051,269  
Awards forfeited/waived, Number of Shares (129,864)  
Awards cancelled on failed vesting conditions, Number of Shares (1,990,964)  
Awards vested, Number of Shares (4,810,667)  
Ending Balance, Number of Shares 11,810,781 11,691,007
Employees [Member] | 2013 CEO Special Bonus [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 28,378  
Awards vested, Number of Shares (21,283)  
Ending Balance, Number of Shares 7,095 28,378
Employees [Member] | Employee Plan 2013 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 1,462,359  
Awards forfeited/waived, Number of Shares (9,767)  
Awards vested, Number of Shares (1,452,592)  
Ending Balance, Number of Shares   1,462,359
Employees [Member] | 2014 CEO Special Bonus [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 22,989  
Awards vested, Number of Shares (11,494)  
Ending Balance, Number of Shares 11,495 22,989
Employees [Member] | Employee Plan 2014 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 3,246,106  
Awards forfeited/waived, Number of Shares (35,574)  
Awards vested, Number of Shares (1,599,079)  
Ending Balance, Number of Shares 1,611,453 3,246,106
Employees [Member] | 2015 CEO Special Bonus [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards granted, Number of shares 53,369  
Awards vested, Number of Shares (17,790)  
Ending Balance, Number of Shares 35,579  
Employees [Member] | Employee Plan 2015 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 6,931,175  
Awards forfeited/waived, Number of Shares (63,228)  
Awards cancelled on failed vesting conditions, Number of Shares (1,990,964)  
Awards vested, Number of Shares (1,706,244)  
Ending Balance, Number of Shares 3,170,739 6,931,175
Employees [Member] | Employee Plan 2016 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards granted, Number of shares 6,997,900  
Awards forfeited/waived, Number of Shares (21,295)  
Awards vested, Number of Shares (2,185)  
Ending Balance, Number of Shares 6,974,420  
Supervisory Board [Member] | 2005 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares   22,115
Year of grant 2005  
Exercised   (22,115)
Shares corresponding to exercised option not yet available for trade as of 31.12.2015 0  
Supervisory Board [Member] | 2006 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 3,000 21,000
Year of grant 2006  
Exercised (3,000) (18,000)
Ending Balance, Number of Shares   3,000
Shares corresponding to exercised option not yet available for trade as of 31.12.2015 0  
Supervisory Board [Member] | 2007 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 19,500 46,500
Year of grant 2007  
Exercised (12,000) (27,000)
Ending Balance, Number of Shares 7,500 19,500
Shares corresponding to exercised option not yet available for trade as of 31.12.2015 0  
Supervisory Board [Member] | 2008 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 39,000 60,000
Year of grant 2008  
Exercised (15,000) (21,000)
Ending Balance, Number of Shares 24,000 39,000
Shares corresponding to exercised option not yet available for trade as of 31.12.2015 0  
Supervisory Board [Member] | 2009 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 45,000 75,000
Year of grant 2009  
Exercised (10,000) (30,000)
Ending Balance, Number of Shares 35,000 45,000
Shares corresponding to exercised option not yet available for trade as of 31.12.2015 0  
Supervisory Board [Member] | 2010 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 45,000 75,000
Year of grant 2010  
Exercised   (30,000)
Ending Balance, Number of Shares 45,000 45,000
Shares corresponding to exercised option not yet available for trade as of 31.12.2015 0  
Supervisory Board [Member] | 2011 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 82,500 97,500
Year of grant 2011  
Exercised (15,000) (15,000)
Ending Balance, Number of Shares 67,500 82,500
Shares corresponding to exercised option not yet available for trade as of 31.12.2015 0  
Supervisory Board [Member] | 2012 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 95,000 102,500
Year of grant 2012  
Exercised (7,500) (7,500)
Ending Balance, Number of Shares 87,500 95,000
Shares corresponding to exercised option not yet available for trade as of 31.12.2015 0