XML 162 R137.htm IDEA: XBRL DOCUMENT v3.3.1.900
Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net, Total $ (6,393) $ (8,695) $ (469)
Derivative, Collateral, Obligation to Return Securities 0 27  
Derivative, Collateral, Obligation to Return Cash 0 0  
Derivative Asset, Fair Value, Amount Offset Against Collateral 13 61  
Derivative Asset, Not Subject to Master Netting Arrangement 0 0  
Derivative Asset 13 88  
United Dominion Reality L P [Member]      
Derivative [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net, Total (82) (285) (348)
Derivative, Collateral, Obligation to Return Securities 0 0  
Derivative, Collateral, Obligation to Return Cash 0 0  
Derivative Asset, Fair Value, Amount Offset Against Collateral 8 39  
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 8 39  
Derivative Asset, Not Subject to Master Netting Arrangement 0 0  
Derivative Asset $ 8 $ 39  
Interest rate contracts | Cash Flow Hedging      
Derivative [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net, Total     $ (469)