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Shareholders' Equity - Summary of Nonvested Share Activity (Detail)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Employees [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 8,060,218  
Awards granted, Number of shares 6,412,045  
Awards forfeited, Number of Shares (271,171)  
Awards cancelled on failed vesting conditions, Number of Shares (2,091,931)  
Awards vested, Number of Shares (2,510,061)  
Ending Balance, Number of Shares 9,599,100  
Supervisory Board [Member] | 2005 [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 34,115 34,115
Year of grant 2005  
Granted and vested 66,000   
Waived at grant (15,000)   
Exercised (3,000)   
Awards forfeited, Number of Shares      
Ending Balance, Number of Shares 31,115 34,115
Shares corresponding to exercised option not yet available for trade as of 31. 12. 2013     
Supervisory Board [Member] | 2006 [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 33,000 33,000
Year of grant 2006  
Granted and vested 66,000   
Waived at grant (15,000)   
Exercised (3,000)   
Awards forfeited, Number of Shares      
Ending Balance, Number of Shares 30,000 33,000
Shares corresponding to exercised option not yet available for trade as of 31. 12. 2013     
Supervisory Board [Member] | 2007 [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 82,500 82,500
Year of grant 2007  
Granted and vested 165,000   
Waived at grant (22,500)   
Exercised (22,500)   
Awards forfeited, Number of Shares      
Ending Balance, Number of Shares 60,000 82,500
Shares corresponding to exercised option not yet available for trade as of 31. 12. 2013     
Supervisory Board [Member] | 2008 [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 85,000 85,000
Year of grant 2008  
Granted and vested 165,000   
Waived at grant (22,500)   
Exercised (10,000)   
Awards forfeited, Number of Shares      
Ending Balance, Number of Shares 75,000 85,000
Shares corresponding to exercised option not yet available for trade as of 31. 12. 2013     
Supervisory Board [Member] | 2009 [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 95,000 95,000
Year of grant 2009  
Granted and vested 165,000   
Waived at grant (7,500)   
Exercised (20,000)   
Awards forfeited, Number of Shares      
Ending Balance, Number of Shares 75,000 95,000
Shares corresponding to exercised option not yet available for trade as of 31. 12. 2013     
Supervisory Board [Member] | 2010 [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 107,500 107,500
Year of grant 2010  
Granted and vested 172,500   
Waived at grant (7,500)   
Exercised (25,000)   
Awards forfeited, Number of Shares      
Ending Balance, Number of Shares 82,500 107,500
Shares corresponding to exercised option not yet available for trade as of 31. 12. 2013     
Supervisory Board [Member] | 2011 [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 142,500 142,500
Year of grant 2011  
Granted and vested 172,500   
Waived at grant (30,000)   
Exercised (25,000)   
Awards forfeited, Number of Shares      
Ending Balance, Number of Shares 117,500 142,500
Shares corresponding to exercised option not yet available for trade as of 31. 12. 2013     
Supervisory Board [Member] | 2012 [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 157,500   
Year of grant 2012  
Granted and vested 180,000 180,000
Waived at grant (22,500) (22,500)
Exercised (35,000)   
Awards forfeited, Number of Shares      
Ending Balance, Number of Shares 122,500 157,500
Shares corresponding to exercised option not yet available for trade as of 31. 12. 2013 10,000  
Employee Plan 2010 [Member] | Employees [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 1,485,836  
Awards granted, Number of shares     
Awards forfeited, Number of Shares (21,180)  
Awards cancelled on failed vesting conditions, Number of Shares     
Awards vested, Number of Shares (1,464,656)  
Ending Balance, Number of Shares     
2012 CEO Special Bonus [Member] | Employees [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 100,862  
Awards granted, Number of shares     
Awards forfeited, Number of Shares     
Awards cancelled on failed vesting conditions, Number of Shares     
Awards vested, Number of Shares (33,621)  
Ending Balance, Number of Shares 67,241  
Employee Plan 2012 [Member] | Employees [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 6,473,520  
Awards granted, Number of shares     
Awards forfeited, Number of Shares (219,711)  
Awards cancelled on failed vesting conditions, Number of Shares (2,091,931)  
Awards vested, Number of Shares (1,009,339)  
Ending Balance, Number of Shares 3,152,539  
Employee Plan 2013 [Member] | Employees [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares     
Awards granted, Number of shares 6,412,045  
Awards forfeited, Number of Shares (30,280)  
Awards cancelled on failed vesting conditions, Number of Shares     
Awards vested, Number of Shares (2,445)  
Ending Balance, Number of Shares 6,379,320