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Equity - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 Absolute Performance Awards [Member] | Mar. 31, 2013 Relative Performance Awards [Member] | Dec. 31, 2012 VSEP grants [Member] | Dec. 31, 2012 Additional vesting [Member] | Dec. 31, 2012 Performance period [Member]
Common Shares [Line Items] |  |  |  |  |  |  |
Common shares issued | 2.3 |  |  |  |  |  |
Gross proceeds | $ 40.0 |  |  |  |  |  |
Common equity program, generating gross proceeds per share | $ 17.57 |  |  |  |  |  |
Common share dividends declared | $ 0.135 | $ 0.120 |  |  |  |  |
Period for which the options granted are generally vested |  |  |  |  | 7 years | 4 years | 3 years
Compound annual growth rate |  |  | 8.00% |  |  |  |
Performance awards |  |  | 18.0 | 36.0 |  |  |
Aggregate percentage of performance awards |  |  | 1.4133% | 1.9337% |  |  |
Expected vesting percentage | 20.00% |  |  |  |  |  |
Unrecognized compensation costs | $ 8.7 |  |  |  |  |  |
Term of recognition of unrecognized stock option compensation costs | 7 years |  |  |  |  |  |

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