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Equity - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended		1 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Apr. 30, 2013 Class K Preferred Stock [Member]	Apr. 30, 2013 Class H Preferred Stock [Member]	Jun. 30, 2013 Absolute Performance Awards [Member]	Jun. 30, 2013 Relative performance awards [Member]	Dec. 31, 2012 VSEP Grants [Member]	Dec. 31, 2012 Additional Vesting [Member]	Dec. 31, 2012 Performance Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate number of shares issued as per forward sale agreement	39.1		39.1
Initial price of per share	$ 18.21582		$ 18.21582
Common shares issued			4.8
Common equity program, generating gross proceeds per share	$ 17.71		$ 17.71
Gross proceeds			$ 85,000,000
Cumulative redeemable preferred shares	205,000,000		205,000,000		150,000,000
Preferred stock dividend rate			7.375%		6.25%	7.375%
preferred stock stated value					$ 500.00
Cumulative redeemable preferred shares share redemption price per share					$ 25.00	$ 25.00
Preferred Stock redemption value						150,000,000
Cumulative redeemable preferred shares total redemption price per share						$ 25.1127
Redeemable preferred stock dividend per share prorated to redemption date						$ 0.1127
Write-off of preferred share original issuance costs	5,246,000	0	5,246,000	0		5,200,000
Period for which the options granted are generally vested									7 years	4 years	3 years
Compound annual growth rate							8.00%
Performance awards							18,000,000	36,000,000
Aggregate percentage of performance awards							1.4133%	1.9337%
Expected vesting percentage			20.00%
Unrecognized compensation costs			$ 8,200,000
Term of recognition of unrecognized stock option compensation costs			6 years 6 months

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