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Equity - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				12 Months Ended
	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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