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Basis of Presentation and Summary of Significant Accounting Policies (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Schedule of Capitalization, Equity [Line Items]        
Balance, December 31, 2011     $ 1,144,674  
Contributions     1,784  
Issuance of common stock/units     594,437  
Issuance of preferred stock/units     9,818  
Redemption of preferred stock/units     (600,956)  
Preferred stock/unit dividends/distributions     (26,774)  
Common dividends and distributions     (107,874)  
Redemptions of common OP Units     (8,372)  
Amortization of stock-based compensation cost     4,130  
Stock option exercises     48,906  
Effect of changes in ownership for consolidated entities (Note 4)     (52,771)  
Change in accumulated other comprehensive loss (155) (7,988) 370 (7,242)
Other     2,383  
Net income (loss)     93,223  
Balance, September 30, 2012 1,102,978   1,102,978  
Partners' capital attributable to the Partnership
       
Schedule of Capitalization, Equity [Line Items]        
Change in accumulated other comprehensive loss (155) (7,988) 370 (7,242)
Aimco Equity [Member]
       
Schedule of Capitalization, Equity [Line Items]        
Balance, December 31, 2011     908,329  
Contributions         
Issuance of common stock/units     594,437  
Issuance of preferred stock/units     9,818  
Redemption of preferred stock/units     (600,956)  
Preferred stock/unit dividends/distributions     (26,774)  
Common dividends and distributions     (74,882)  
Redemptions of common OP Units         
Amortization of stock-based compensation cost     4,130  
Stock option exercises     48,906  
Effect of changes in ownership for consolidated entities (Note 4)     (51,532)  
Change in accumulated other comprehensive loss     463  
Other     203  
Net income (loss)     63,530  
Balance, September 30, 2012 875,672   875,672  
Noncontrolling Interests in Consolidated Real Estate Partnerships [Member]
       
Schedule of Capitalization, Equity [Line Items]        
Balance, December 31, 2011     270,666  
Contributions     1,784  
Issuance of common stock/units         
Issuance of preferred stock/units         
Redemption of preferred stock/units         
Preferred stock/unit dividends/distributions         
Common dividends and distributions     (28,377)  
Redemptions of common OP Units         
Amortization of stock-based compensation cost         
Stock option exercises         
Effect of changes in ownership for consolidated entities (Note 4)     (8,408)  
Change in accumulated other comprehensive loss     (133)  
Other     (10)  
Net income (loss)     28,764  
Balance, September 30, 2012 264,286   264,286  
Common Noncontrolling Interests in Aimco Operating Partnership [Member]
       
Schedule of Capitalization, Equity [Line Items]        
Balance, December 31, 2011     (34,321)  
Contributions         
Issuance of common stock/units     0  
Issuance of preferred stock/units         
Redemption of preferred stock/units         
Preferred stock/unit dividends/distributions         
Common dividends and distributions     (4,615)  
Redemptions of common OP Units     (8,372)  
Amortization of stock-based compensation cost         
Stock option exercises         
Effect of changes in ownership for consolidated entities (Note 4)     7,169  
Change in accumulated other comprehensive loss     40  
Other     2,190  
Net income (loss)     929  
Balance, September 30, 2012 $ (36,980)   $ (36,980)