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5. Capital Stock (Detail) - Summary of Stock Option Activity
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3 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
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Mar. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2009
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| Outstanding, beginning of period | 125,000,000 | 62,800,000 | 13,555,000 | |
| Granted | 84,700,000 | 51,350,000 | 9,163,541 | |
| Exercised | 1,000,000 | 20,000,000 | 450,000 | |
| Expired | (1,655,000) | |||
| Outstanding, end of period | 125,000,000 | 62,800,000 | ||
| Exercisable, end of period | 125,000,000 | 50,424,488 | ||
| X | ||||||||||
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- Definition
The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Net number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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