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Supplemental Information to Statements of Cash Flows - Cash Flow Information (Detail) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Supplemental Cash Flow Information [Line Items] |  |  |
Interest Expense Capitalized in Connection with Development Activity | $ 1,025 | $ 742 |
Supplemental Schedule of Non-Cash Investing and Financing Activities: |  |  |
Distribution Payable on Common Stock/Operating Partnership Units | 14,970 |  | $ 11,949
Exchange of Operating Partnership Units for Common Stock: |  |  |
Conversion of Units to Common Stock | 0 | 0 |
Assumption of Liabilities in Connection with the Acquisition of Real Estate | 295 | 183 |
Accounts Payable Related to Construction in Progress and Additions to Investment in Real Estate | 16,863 | 17,829 |
Write-off of Fully Depreciated Assets | (20,146) | (19,462) |
Noncontrolling Interest |  |  |
Exchange of Operating Partnership Units for Common Stock: |  |  |
Conversion of Units to Common Stock | (100) | (1,333) |
Common Stock |  |  |
Exchange of Operating Partnership Units for Common Stock: |  |  |
Conversion of Units to Common Stock | 0 | 1 |
Additional Paid-in-Capital |  |  |
Exchange of Operating Partnership Units for Common Stock: |  |  |
Conversion of Units to Common Stock | 100 | 1,332 |
Common Stock |  |  |
Supplemental Schedule of Non-Cash Investing and Financing Activities: |  |  |
Distribution Payable on Common Stock/Operating Partnership Units | $ 14,970 | $ 11,891 |

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