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Fair Value (Details 2) - Recurring basis
$ in Thousands
Sep. 30, 2015
USD ($)
Fair Value, Inputs, Level 1 [Member]  
Financial Instruments Measured/Discussed at Fair Value  
DownREIT units $ (1,311)
Total (3,376,578)
Fair Value, Inputs, Level 2 [Member]  
Financial Instruments Measured/Discussed at Fair Value  
Total (2,891,365)
Fair Value, Inputs, Level 3 [Member]  
Financial Instruments Measured/Discussed at Fair Value  
Total (8,765)
Fair Value, Inputs, Level 3 [Member] | Puts  
Financial Instruments Measured/Discussed at Fair Value  
Fair value of remaining outstanding Puts (8,765)
Cash Flow Hedges | Fair Value, Inputs, Level 2 [Member] | Interest Rate Cap [Member]  
Financial Instruments Measured/Discussed at Fair Value  
Derivative assets 8
Unsecured notes | Fair Value, Inputs, Level 1 [Member]  
Financial Instruments Measured/Discussed at Fair Value  
Indebtedness (3,375,267)
Secured Debt and Variable Rate Unsecured Term Loan [Member] | Fair Value, Inputs, Level 2 [Member]  
Financial Instruments Measured/Discussed at Fair Value  
Indebtedness (2,891,388)
Not Designated as Hedging Instrument [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Cap [Member]  
Financial Instruments Measured/Discussed at Fair Value  
Derivative assets 15
Estimate of Fair Value Measurement [Member]  
Financial Instruments Measured/Discussed at Fair Value  
DownREIT units (1,311)
Total (6,276,708)
Estimate of Fair Value Measurement [Member] | Puts  
Financial Instruments Measured/Discussed at Fair Value  
Fair value of remaining outstanding Puts (8,765)
Estimate of Fair Value Measurement [Member] | Cash Flow Hedges | Interest Rate Cap [Member]  
Financial Instruments Measured/Discussed at Fair Value  
Derivative assets 8
Estimate of Fair Value Measurement [Member] | Unsecured notes  
Financial Instruments Measured/Discussed at Fair Value  
Indebtedness (3,375,267)
Estimate of Fair Value Measurement [Member] | Secured Debt and Variable Rate Unsecured Term Loan [Member]  
Financial Instruments Measured/Discussed at Fair Value  
Indebtedness (2,891,388)
Estimate of Fair Value Measurement [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Cap [Member]  
Financial Instruments Measured/Discussed at Fair Value  
Derivative assets $ 15