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Subsequent Events - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified | 9 Months Ended | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended
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Sep. 30, 2013 | May 31, 2013 Senior Unsecured Notes Due May 2023 [Member] | Sep. 30, 2013 Forward Sale [Member] | Oct. 31, 2013 Subsequent Events [Member] ShoppingCenter | Oct. 31, 2013 Subsequent Events [Member] Senior Unsecured Notes Due May 2023 [Member] | Oct. 31, 2013 Subsequent Events [Member] Forward Sale [Member] | Oct. 31, 2013 Subsequent Events [Member] Preferred Equity Interest and Mezzanine Loan [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |
Number of prime power centers acquired |  |  |  | 30 |  |  |
Transaction value for sole ownership interest acquired |  |  |  | $ 1,460,000,000 |  |  |
Total Transaction value for sole ownership interest acquired |  |  |  | 1,540,000,000 |  |  |
Ownership interest acquired cash paid | 306,100,000 |  |  | 566,400,000 |  |  |
Notes maturity date |  | May 31, 2023 |  |  | May 31, 2023 |  |
Sale of common shares |  |  | 39.1 |  |  | 39.1 |
Sole ownership interest acquired, mortgage debt assumed that was repaid at closing |  |  |  | 139,000,000 |  |  |
Preferred equity and Mezzanine loan repaid |  |  |  | 148,800,000 |  |  | 148,800,000
Ownership interest percentage |  |  |  | 100.00% |  |  |
Ownership interest of joint venture partner |  |  |  | 95.00% |  |  |
Sole ownership interest acquired, mortgage debt assumed |  |  |  | 792,900,000 |  |  |
Sole ownership interest acquired, cash deposit paid | $ 25,000,000 |  |  |  |  |  |
Interest rate of Notes |  | 3.375% |  |  |  |  |

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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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