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Shareholders' Equity - Summary of Grants Under Outstanding Stock Award Plans (Detail) | 12 Months Ended
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Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted, Number of Shares | 6,700,765 |
Supervisory Board 2009 Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted, Number of Shares |  |
Employee Plan 2009 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted, Number of Shares |  |
Supervisory Board 2010 Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted, Number of Shares |  |
Employee Plan 2010 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted, Number of Shares |  |
Supervisory Board 2011 Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted, Number of Shares |  |
Employee Plan 2011 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted, Number of Shares |  |
Supervisory Board Two Thousand Twelve [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted, Number of Shares | 180,000 |
Employee Plan 2012 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted, Number of Shares | 6,520,765 |
Twenty May Two Thousand Nine [Member] | Supervisory Board 2009 Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Grant date of Nonvested share | May 20, 2009 |
Awards granted, Number of Shares | 165,000 |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Waived | (7,500) |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Lost on Performance |  |
Twenty Eight July Two Thousand Nine [Member] | Employee Plan 2009 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Grant date of Nonvested share | Jul. 28, 2009 |
Awards granted, Number of Shares | 5,575,240 |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Waived |  |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Lost on Performance | (1,827,349) |
Thirty November Two Thousand Nine [Member] | Employee Plan 2009 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Grant date of Nonvested share | Nov. 30, 2009 |
Awards granted, Number of Shares | 8,300 |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Waived |  |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Lost on Performance | (2,762) |
Twenty Seven May Two Thousand Ten [Member] | Supervisory Board 2010 Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Grant date of Nonvested share | May 27, 2010 |
Awards granted, Number of Shares | 172,500 |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Waived | (7,500) |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Lost on Performance |  |
Twenty Two July Two Thousand Ten [Member] | Employee Plan 2010 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Grant date of Nonvested share | Jul. 22, 2010 |
Awards granted, Number of Shares | 6,344,725 |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Waived |  |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Lost on Performance | (2,076,448) |
Seventeen December Two Thousand Ten [Member] | Employee Plan 2010 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Grant date of Nonvested share | Dec. 17, 2010 |
Awards granted, Number of Shares | 221,650 |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Waived |  |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Lost on Performance | (73,524) |
Three May Two Thousand Eleven [Member] | Supervisory Board 2011 Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Grant date of Nonvested share | May 03, 2011 |
Awards granted, Number of Shares | 172,500 |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Waived | (30,000) |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Lost on Performance |  |
Twenty Five July Two Thousand Eleven [Member] | Employee Plan 2011 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Grant date of Nonvested share | Jul. 25, 2011 |
Awards granted, Number of Shares | 5,881,630 |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Waived |  |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Lost on Performance | (5,824,445) |
Fourteen November Two Thousand Eleven [Member] | Employee Plan 2011 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Grant date of Nonvested share | Nov. 14, 2011 |
Awards granted, Number of Shares | 95,000 |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Waived |  |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Lost on Performance | (91,540) |
Thirty May Two Thousand Twelve [Member] | Supervisory Board Two Thousand Twelve [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Grant date of Nonvested share | May 30, 2012 |
Awards granted, Number of Shares | 180,000 |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Waived | (22,500) |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Lost on Performance |  |
Twenty Three July Two Thousand Twelve [Member] | Employee Plan 2012 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Grant date of Nonvested share | Jul. 23, 2012 |
Awards granted, Number of Shares | 6,216,285 |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Waived | (2,400) |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Lost on Performance |  | [1]
Twenty one December Two Thousand Twelve [Member] | Employee Plan 2012 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Grant date of Nonvested share | Dec. 21, 2012 |
Awards granted, Number of Shares | 304,480 |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Waived |  |
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Lost on Performance |  | [1]
[1] | As at December 31, 2012, a final determination of the achievement of the performance conditions had not yet been made by the Compensation Committee of the Supervisory Board

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