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Shareholders' Equity - Summary of Grants under Outstanding Stock Award Plans (Detail) | 12 Months Ended
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Dec. 31, 2016 shares
Employees [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Awards granted, Number of shares | 7,051,269
Employees [Member] | 2015 CEO Special Bonus [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Awards granted, Number of shares | 53,369
Employees [Member] | Employee Plan 2016 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Awards granted, Number of shares | 6,997,900
2005 [Member] | Supervisory Board [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Year of grant | 2005
Options granted and vested | 66,000
Options waived at grant | (15,000)
2006 [Member] | Supervisory Board [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Year of grant | 2006
Options granted and vested | 66,000
Options waived at grant | (15,000)
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)
2013 [Member] | Supervisory Board [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Year of grant | 2013
Options granted and vested | 0
Options waived at grant | 0
2014 [Member] | Supervisory Board [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Year of grant | 2014
Options granted and vested | 0
Options waived at grant | 0
2015 [Member] | Supervisory Board [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Year of grant | 2015
Options granted and vested | 0
Options waived at grant | 0
2016 [Member] | Supervisory Board [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Year of grant | 2016
Options granted and vested | 0
Options waived at grant | 0
July 22, 2013 [Member] | Employees [Member] | 2013 CEO Special Bonus [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | Jul. 22, 2013
Awards granted, Number of shares | 63,848
July 22, 2014 [Member] | Employees [Member] | 2014 CEO Special Bonus [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | Jul. 22, 2014
Awards granted, Number of shares | 34,483
July 22, 2014 [Member] | Employees [Member] | Employee Plan 2014 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | Jul. 22, 2014
Awards granted, Number of shares | 6,458,435
Share based compensation arrangement by share based payment award, Number of shares lost on performance | (1,939,222)
December 18, 2014 [Member] | Employees [Member] | Employee Plan 2014 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | Dec. 18, 2014
Awards granted, Number of shares | 500,775
Share based compensation arrangement by share based payment award, Number of shares lost on performance | (31,332)
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
Twenty Seven July Two Thousand Fifteen [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)
Fifteen December Two Thousand Fifteen [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)
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
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

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