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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
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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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- Definition Amount to be paid per share that is classified as temporary equity by entity upon redemption. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Article 5 + Details
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