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Unaudited Summarized Consolidated Quarterly Financial Data (UNITED DOMINION REALTY, L.P.) (Details) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2015

Sep. 30, 2015

Jun. 30, 2015

Mar. 31, 2015

Dec. 31, 2014

Sep. 30, 2014

Jun. 30, 2014

Mar. 31, 2014

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

Quarterly Financial Data [Abstract]

Rental income

^[1]

$ 234,352

$ 217,765

$ 212,764

$ 207,047

$ 206,104

$ 203,587

$ 200,959

$ 194,352

Income/(loss) from continuing operations

4,528

13,695

10,842

76,417

6,485

10,611

4,359

(5,195)

$ 105,482

$ 16,260

$ 2,340

Income/(loss) from discontinued operations

0

79

18

(87)

0

10

43,942

Net income/(loss) attributable to Entity

340,383

154,334

44,812

Net (loss)/income attributable to stakeholders

161,270

12,361

85,924

72,891

$ 64,486

$ 39,618

$ 29,076

$ 17,430

336,661

150,610

41,088

Earnings per weighted average common share - basic and diluted:

Net (loss)/income attributable to common stockholders — basic and diluted (in dollars per share)

^[2]

$ 0.25

$ 0.16

$ 0.12

$ 0.07

United Dominion Reality L.P.

Quarterly Financial Data [Abstract]

Rental income

101,982

115,173

113,158

110,095

$ 107,978

$ 107,444

$ 104,842

$ 102,370

440,408

422,634

401,853

Income/(loss) from continuing operations

14,516

14,952

15,355

12,117

9,939

8,875

8,319

6,411

56,940

33,544

32,766

Income/(loss) from discontinued operations

0

0

45,176

Net income/(loss) attributable to Entity

$ 114,955

$ 14,617

$ 47,383

$ 36,346

$ 32,631

$ 8,637

$ 24,426

$ 30,533

$ 213,301

$ 96,227

$ 73,376

Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted

$ 0.62

^[3]

$ 0.08

^[3]

$ 0.26

^[3]

$ 0.20

^[3]

$ 0.18

$ 0.05

$ 0.13

$ 0.17

$ 1.16

$ 0.53

$ 0.40

[1]	Represents rental income from continuing operations, excluding amounts classified as discontinued operations.
[2]	.
[3]	Quarterly income/(loss) per OP Unit amounts may not total to the annual amounts

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- Definition

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