Consolidated Statements of Cash Flows (UNITED DOMINION REALTY, L.P) (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating Activities
Net income/(loss)	$ 5,045	$ 242,934
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	170,857	180,656
Net gain on the sale of depreciable property	0	252,531
Hurricane-related recovery noncash income	(2,275)	0
Other operating activities, Cash Flow Statement	13,056	14,174
Changes in operating assets and liabilities:
Increase/(decrease) in operating assets	(2,642)	18,242
Increase in operating liabilities	(9,283)	(31,151)
Net cash provided by operating activities	172,389	151,733
Investing Activities
Development of real estate assets	(172,034)	(105,861)
Proceeds from sales of real estate investments, net	140,834	594,680
Net cash provided by/(used in) investing activities	(35,913)	75,499
Financing Activities
Proceeds from the issuance of secured debt	0	2,570
Payments on secured debt	(42,556)	(484,534)
Net cash provided by/(used in) financing activities	(139,556)	(55,623)
Net increase in cash and cash equivalents	(3,080)	171,609
Cash and cash equivalents, beginning of period	12,115	12,503
Cash and cash equivalents, end of period	9,035	184,112
Supplemental Information:
Interest paid during the period, net of amounts capitalized	64,570	68,936
Reallocation of Credit Facilities Debt from General Partner	13,682	0
United Dominion Reality L.P. [Member]
Operating Activities
Net income/(loss)	17,994	44,511
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	90,635	98,411
Net gain on the sale of depreciable property	0	51,182
Hurricane-related recovery noncash income	(2,151)	0
Other operating activities, Cash Flow Statement	1,989	1,333
Changes in operating assets and liabilities:
Increase/(decrease) in operating assets	665	3,863
Increase in operating liabilities	2,090	(1,092)
Net cash provided by operating activities	111,222	95,844
Investing Activities
Development of real estate assets	(27,752)	(3,572)
Proceeds from sales of real estate investments, net	0	113,263
Capital expenditures and other major improvements — real estate assets, net of escrow reimbursement	48,035	41,377
Net cash provided by/(used in) investing activities	(75,787)	68,314
Financing Activities
Advances from General Partner, net	10,573	61,423
Proceeds from the issuance of secured debt	0	26,054
Payments on secured debt	(39,865)	(246,665)
Distributions paid to partnership unitholders	(4,625)	(4,500)
Payment of financing costs	(1,125)	0
Net cash provided by/(used in) financing activities	(35,042)	(163,688)
Net increase in cash and cash equivalents	393	470
Cash and cash equivalents, beginning of period	2,804	704
Cash and cash equivalents, end of period	3,197	1,174
Supplemental Information:
Interest paid during the period, net of amounts capitalized	$ 22,064	$ 26,003