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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, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract] |  |  |
Mortgages assumed from acquisitions | $ 969,700,000 | $ 271,600,000 | $ 173,000,000
Elimination of the previously held equity interest in unconsolidated joint ventures acquired | 186,500,000 | 36,800,000 | 200,000
Accounts payable related to construction in progress | 21,500,000 | 18,200,000 | 3,400,000
Write-off of preferred share original issuance costs | 5,246,000 | 5,804,000 | 6,402,000
Dividends declared | 55,107,000 | 44,210,000 | 29,100,000
Equity derivative liability - affiliate | 0 | 0 | 74,300,000
Deconsolidation of net assets | $ 0 | $ 0 | $ 5,000,000

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