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Supplemental Information to Statements of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012
Interest Expense Capitalized in Connection with Development Activity | $ 3,077 | $ 1,185
Mortgage Loan Payable Assumed in Conjunction with a Property Acquisition | 0 | 12,026
Write-off of Fully Depreciated Assets | (44,234) | (36,560)
Supplemental Schedule of Non-Cash Investing and Financing Activities: |  |
Distribution Payable | 9,788 |
Exchange of Operating Partnership Units for Common Stock: |  |
Conversion of Units to Common Stock | 0 | 0
Noncontrolling Interest |  |
Exchange of Operating Partnership Units for Common Stock: |  |
Conversion of Units to Common Stock | (943) | (2,710)
Common Stock |  |
Exchange of Operating Partnership Units for Common Stock: |  |
Conversion of Units to Common Stock | 1 | 3
Additional Paid-in Capital |  |
Exchange of Operating Partnership Units for Common Stock: |  |
Conversion of Units to Common Stock | 942 | 2,707
Common Stock |  |
Supplemental Schedule of Non-Cash Investing and Financing Activities: |  |
Distribution Payable | 9,788 | 0
Preferred Stock |  |
Supplemental Schedule of Non-Cash Investing and Financing Activities: |  |
Distribution Payable | $ 0 | $ 5,177

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