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Subsequent Events - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 1 Months Ended |  | 1 Months Ended | 3 Months Ended
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Mar. 31, 2013 | Apr. 30, 2013 Subsequent Events [Member] Business Acquisitions [Member] PrimePowerCenter | Apr. 30, 2013 Subsequent Events [Member] Common Shares [Member] | Apr. 30, 2013 Class K cumulative redeemable preferred shares [Member] Subsequent Events [Member] | Mar. 31, 2013 Class H cumulative redeemable preferred shares [Member] | May 31, 2013 Class H cumulative redeemable preferred shares [Member] Subsequent Events [Member] | Jun. 30, 2013 Class H cumulative redeemable preferred shares [Member] Subsequent Events [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |
Issue of cumulative redeemable preferred shares |  |  |  | $ 150,000,000 | $ 205,000,000 |  |
Preferred stock dividend rate |  |  |  | 6.25% |  | 7.375% |
Cumulative redeemable preferred shares redemption price per share |  |  |  | $ 500.00 |  | $ 500.00 |
Cumulative redeemable preferred shares redemption price depository share |  |  |  | $ 25.00 |  | $ 25.00 |
Accrued and unpaid dividends per Class H Preferred Share |  |  |  |  |  | $ 2.2535 |
Accrued and unpaid dividends per depositary share |  |  |  |  |  | $ 0.1127 |
Write-off of preferred share original issuance costs |  |  |  |  |  |  | 5,200,000
Cumulative redeemable preferred shares redeemed, value |  |  |  |  |  | 150,000,000 |
Percentage of ownership acquired |  | 85.00% |  |  |  |  |
Number of prime power centers |  | 5 |  |  |  |  |
Purchase price of acquired entities |  | 93,900,000 |  |  |  |  |
Number of common shares issued | 2.3 |  | 2.5 |  |  |  |
Weighted-average price of common shares | $ 17.57 |  | $ 17.83 |  |  |  |
Gross proceeds | $ 40,000,000 |  | $ 45,000,000 |  |  |  |

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- Definition The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The excess of (1) fair value of the consideration transferred to the holders of the preferred stock over (2) the carrying amount of the preferred stock in the registrant's balance sheet, during the accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6802175&loc=d3e42851-122695 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number D-42 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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