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Shareholders' Equity - Summary of Nonvested Share Activity (Detail) | 12 Months Ended
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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 |

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- Definition Non vested Shares Corresponding To Exercised Option Not Yet Available For Trade + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options cancelled on failed vesting conditions in period. + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Granted And Vested In Period + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Waived + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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