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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