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Schedule III - Real Estate and Accumulated Depreciation (Detail) - Changes in Total Real Estate Assets and Accumulated Depreciation (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Balance, beginning of period $ 8,771,256,852 $ 8,587,378,001 $ 8,877,013,625
Acquisitions 411,166,315 406,431,259 83,833,304
Improvements 85,801,777 118,072,955 115,592,035
Transfers from (to) unconsolidated joint ventures 212,231,319 (49,812,485) 115,482,953
Sales (503,767,086) (186,887,870) (603,652,663)
Assets held for sale (9,845,065) (4,503,823) (4,445,309)
Adjustment of fully depreciated assets (21,711,782) (27,412,282) (15,047,644)
Adjustment of property carrying values (34,121,504) (4,616,890) (17,601,053)
Change in exchange rate 36,275,820 (67,392,013) 36,202,753
Balance, end of period 8,947,286,646 8,771,256,852 8,587,378,001
Balance, beginning of period 1,693,089,989 1,549,380,256 1,343,148,498
Depreciation for year 248,426,786 237,782,626 244,903,628
Transfers (to) unconsolidated joint ventures (8,390,550) (2,725,794)  
Sales (161,515,292) (59,086,170) (23,610,893)
Adjustment of fully depreciated assets (21,711,782) (27,412,282) (15,047,644)
Assets held for sale (6,582,611) (633,676) (13,333)
Change in exchange rate 2,145,037 (4,214,971)  
Balance, end of period $ 1,745,461,577 $ 1,693,089,989 $ 1,549,380,256