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Fair Value (Details 2) (Recurring basis, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Total Fair Value
   
Financial Instruments Measured at Fair Value    
DownREIT units $ (1,017) $ (980)
Indebtedness (4,077,397) (3,838,360)
Total (4,137,453) (3,930,330)
Total Fair Value | Puts
   
Financial Instruments Measured at Fair Value    
Fair value of remaining outstanding Put (5,574) (5,648)
Total Fair Value | Interest Rate Caps
   
Financial Instruments Measured at Fair Value    
Derivative assets 19 114
Total Fair Value | Interest Rate Swaps
   
Financial Instruments Measured at Fair Value    
Derivative liabilities (53,484) (85,456)
Quoted Prices in Active Markets for Identical Assets (Level 1)
   
Financial Instruments Measured at Fair Value    
DownREIT units (1,017) (980)
Indebtedness (2,102,927) (1,761,823)
Total (2,103,944) (1,762,803)
Significant Other Observable Inputs (Level 2)
   
Financial Instruments Measured at Fair Value    
Indebtedness (1,974,470) (2,076,537)
Total (2,027,935) (2,161,879)
Significant Other Observable Inputs (Level 2) | Interest Rate Caps
   
Financial Instruments Measured at Fair Value    
Derivative assets 19 114
Significant Other Observable Inputs (Level 2) | Interest Rate Swaps
   
Financial Instruments Measured at Fair Value    
Derivative liabilities (53,484) (85,456)
Significant Unobservable Inputs (Level 3)
   
Financial Instruments Measured at Fair Value    
Total (5,574) (5,648)
Significant Unobservable Inputs (Level 3) | Puts
   
Financial Instruments Measured at Fair Value    
Fair value of remaining outstanding Put $ (5,574) $ (5,648)