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Cash Flow Information (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2012 | Sep. 30, 2011
Supplemental schedule of non-cash investing and financing activities: |  |
Distribution payable on preferred stock | $ 5,177 |
Write-off of fully depreciated assets | (36,560) | (34,644)
Mortgage loan payable assumed in conjunction with a property acquisition | 12,026 | 24,417
Notes receivable issued in conjunction with certain property sales |  | 1,279
Noncontrolling Interest [Member] |  |
Supplemental schedule of non-cash investing and financing activities: |  |
Conversion of Units to Common Stock | (2,710) | (885)
Common Stock [Member] |  |
Supplemental schedule of non-cash investing and financing activities: |  |
Conversion of Units to Common Stock | 3 | 1
Additional Paid-in Capital [Member] |  |
Supplemental schedule of non-cash investing and financing activities: |  |
Conversion of Units to Common Stock | $ 2,707 | $ 884

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