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Shareholders' Equity - Summary of Grants under Outstanding Stock Award Plans (Detail) | 12 Months Ended
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Dec. 31, 2018 shares
Supervisory Board [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Year of grant | 2013 to 2018
Options waived at grant | 0
Employees [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Awards granted, Number of Shares | 8,018,493
Employees [Member] | 2017 CEO Special Bonus [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Awards granted, Number of Shares | 22,883
Employees [Member] | Employee Plan 2018 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Awards granted, Number of Shares | 7,995,610
2007 [Member] | Supervisory Board [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Year of grant | 2007
Options granted and vested | 165,000
Options waived at grant | (22,500)
2008 [Member] | Supervisory Board [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Year of grant | 2008
Options granted and vested | 165,000
Options waived at grant | (22,500)
2009 [Member] | Supervisory Board [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Year of grant | 2009
Options granted and vested | 165,000
Options waived at grant | (7,500)
2010 [Member] | Supervisory Board [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Year of grant | 2010
Options granted and vested | 172,500
Options waived at grant | (7,500)
2011 [Member] | Supervisory Board [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Year of grant | 2011
Options granted and vested | 172,500
Options waived at grant | (30,000)
2012 [Member] | Supervisory Board [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Year of grant | 2012
Options granted and vested | 180,000
Options waived at grant | (22,500)
March 24, 2015 [Member] | Employees [Member] | 2015 CEO Special Bonus [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | Mar. 24, 2015
Awards granted, Number of Shares | 53,369
July 27, 2015 [Member] | Employees [Member] | Employee Plan 2015 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | Jul. 27, 2015
Awards granted, Number of Shares | 6,591,200
Share based compensation arrangement by share based payment award, Number of shares lost on performance | (1,961,886)
December 15, 2015 [Member] | Employees [Member] | Employee Plan 2015 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | Dec. 15, 2015
Awards granted, Number of Shares | 370,920
Share based compensation arrangement by share based payment award, Number of shares lost on performance | (29,078)
April 26, 2016 [Member] | Employees [Member] | 2016 CEO Special Bonus [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | Apr. 26, 2016
Awards granted, Number of Shares | 69,165
July 26, 2016 [Member] | Employees [Member] | Employee Plan 2016 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | Jul. 26, 2016
Awards granted, Number of Shares | 6,621,100
Share based compensation arrangement by share based payment award, Number of shares lost on performance | (1,628,376)
December 19, 2016 [Member] | Employees [Member] | Employee Plan 2016 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | Dec. 19, 2016
Awards granted, Number of Shares | 376,800
Share based compensation arrangement by share based payment award, Number of shares lost on performance | (53,900)
June 20, 2017 [Member] | Employees [Member] | 2017 CEO Special Bonus [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | Jun. 20, 2017
Awards granted, Number of Shares | 22,883
July 25, 2017 [Member] | Employees [Member] | Employee Plan 2017 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | Jul. 25, 2017
Awards granted, Number of Shares | 7,634,475
December 22, 2017 [Member] | Employees [Member] | Employee Plan 2017 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | Dec. 22, 2017
Awards granted, Number of Shares | 347,160
July 24, 2018 [Member] | Employees [Member] | Employee Plan 2018 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | Jul. 24, 2018
Awards granted, Number of Shares | 7,552,410
December 20, 2018 [Member] | Employees [Member] | Employee Plan 2018 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | Dec. 20, 2018
Awards granted, Number of Shares | 443,200

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