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Summary of Significant Accounting Policies - Statement of Cash Flows and Supplemental Disclosure of Non-Cash Investing and Financing Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Mortgages and liability assumed from acquisitions | $ 42,300,000 | $ 137,800,000 | $ 0
Consolidation of the net assets (excluding mortgages disclosed below) of previously unconsolidated joint ventures | 383,000,000 | 87,800,000 | 0
Mortgages assumed of previously unconsolidated joint ventures | 246,200,000 | 50,100,000 | 0
Deconsolidation of net assets from the adoption of ASC 810 | 0 | 0 | 20,200,000
Reduction of non-controlling interests from the adoption of ASC 810 | 0 | 0 | 12,400,000
Deconsolidation of net assets | 0 | 5,000,000 | 15,200,000
Reduction of non-controlling interests due to deconsolidation of Mervyns Joint Venture | 0 | 0 | 3,900,000
Foreclosure of note receivable and transfer of collateral | 0 | 0 | 19,000,000
Equity derivative liability - affiliate | 0 | 74,300,000 | 0
Write-off of Preferred Share original issuance costs | 5,804,000 | 6,402,000 | 0
Dividends declared | 44,210,000 | 29,128,000 | 12,100,000
Accounts payable related to construction in progress | $ 18,200,000 | $ 3,400,000 | $ 3,300,000

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