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Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Rental income: |  |  |  |  |
Same store | $ 626,746 | $ 602,046 | $ 1,239,506 | $ 1,191,430 |
Segment Reporting Segment Non Same Store Rental Income | 23,020 | 12,498 | 40,985 | 18,099 |
Segment Reporting Information Revenues | 649,766 | 614,544 | 1,280,491 | 1,117,106 |
Operating expenses: |  |  |  |  |
Same store | 208,086 | 205,213 | 426,227 | 416,591 |
Segment Reporting Segment Non Same Store Operating Expenses | 10,912 | 7,061 | 22,556 | 18,525 |
Segment Reporting Segment Operating Expenses | 218,998 | 212,274 | 448,783 | 398,387 |
NOI: |  |  |  |  |
Same store | 418,660 | 396,833 | 813,279 | 774,839 |
Segment Reporting Information Non Same Store Net Operating Income | 12,108 | 5,437 | 18,429 | (426) |
Segment Reporting Information Net Operating Income | 430,768 | 402,270 | 831,708 | 718,719 |
Assets | 22,991,402 |  | 22,991,402 |  | 22,834,545
Payments to Acquire Other Property, Plant, and Equipment |  |  | 76,912 |  |
Reportable Segments (Textuals) [Abstract] |  |  |  |  |
Units in same store properties |  |  | 100,648 |  |
Rental income | 649,766 | 614,544 | 1,280,491 | 1,117,106 |
Property Repairs and Maintenance | (115,388) | (113,501) | (240,961) | (212,030) |
Real Estate Taxes and Insurance | (83,055) | (76,742) | (165,149) | (141,837) |
Property management | (20,555) | (22,031) | (42,673) | (44,520) |
Total Operating Expenses | (218,998) | (212,274) | (448,783) | (398,387) |
Archstone [Member] |  |  |  |  |
Reportable Segments (Textuals) [Abstract] |  |  |  |  |
Units in same store properties |  |  | 18,465 |  |
Same Store [Domain] |  |  |  |  |
NOI: |  |  |  |  |
Assets | 20,029,692 |  | 20,029,692 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 74,398 |  |
Non-same store [Domain] |  |  |  |  |
NOI: |  |  |  |  |
Assets | 2,961,710 |  | 2,961,710 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 2,514 |  |
Boston [Domain] |  |  |  |  |
Rental income: |  |  |  |  |
Same store | 63,117 | 61,401 | 125,024 | 120,455 |
Segment Reporting Segment Non Same Store Rental Income | 790 | 898 | 1,817 | 1,154 |
Operating expenses: |  |  |  |  |
Same store | 19,259 | 19,444 | 41,414 | 39,651 |
Segment Reporting Segment Non Same Store Operating Expenses | 202 | 201 | 413 | 255 |
NOI: |  |  |  |  |
Same store | 43,858 | 41,957 | 83,610 | 80,804 |
Segment Reporting Information Non Same Store Net Operating Income | 588 | 697 | 1,404 | 899 |
Boston [Domain] | Same Store [Domain] |  |  |  |  |
NOI: |  |  |  |  |
Assets | 1,953,627 |  | 1,953,627 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 8,814 |  |
Boston [Domain] | Non-same store [Domain] |  |  |  |  |
NOI: |  |  |  |  |
Assets | 48,830 |  | 48,830 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 630 |  |
Denver [Domain] |  |  |  |  |
Rental income: |  |  |  |  |
Same store | 27,511 | 25,524 | 54,123 | 50,494 |
Operating expenses: |  |  |  |  |
Same store | 7,648 | 7,770 | 15,098 | 14,987 |
NOI: |  |  |  |  |
Same store | 19,863 | 17,754 | 39,025 | 35,507 |
Denver [Domain] | Same Store [Domain] |  |  |  |  |
NOI: |  |  |  |  |
Assets | 530,832 |  | 530,832 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 1,904 |  |
New York [Domain] |  |  |  |  |
Rental income: |  |  |  |  |
Same store | 114,221 | 109,299 | 225,407 | 217,297 |
Operating expenses: |  |  |  |  |
Same store | 41,898 | 40,634 | 88,102 | 83,745 |
NOI: |  |  |  |  |
Same store | 72,323 | 68,665 | 137,305 | 133,552 |
New York [Domain] | Same Store [Domain] |  |  |  |  |
NOI: |  |  |  |  |
Assets | 4,720,592 |  | 4,720,592 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 8,202 |  |
San Francisco [Domain] |  |  |  |  |
Rental income: |  |  |  |  |
Same store | 84,082 | 77,514 | 165,343 | 152,459 |
Operating expenses: |  |  |  |  |
Same store | 26,305 | 25,955 | 52,960 | 54,109 |
NOI: |  |  |  |  |
Same store | 57,777 | 51,559 | 112,383 | 98,350 |
San Francisco [Domain] | Same Store [Domain] |  |  |  |  |
NOI: |  |  |  |  |
Assets | 2,753,902 |  | 2,753,902 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 12,704 |  |
Seattle [Domain] |  |  |  |  |
Rental income: |  |  |  |  |
Same store | 38,977 | 36,176 | 76,702 | 71,548 |
Segment Reporting Segment Non Same Store Rental Income | 2,756 | 1,271 | 4,444 | 1,303 |
Operating expenses: |  |  |  |  |
Same store | 13,037 | 12,316 | 25,805 | 24,553 |
Segment Reporting Segment Non Same Store Operating Expenses | 1,042 | 373 | 1,779 | 374 |
NOI: |  |  |  |  |
Same store | 25,940 | 23,860 | 50,897 | 46,995 |
Segment Reporting Information Non Same Store Net Operating Income | 1,714 | 898 | 2,665 | 929 |
Seattle [Domain] | Same Store [Domain] |  |  |  |  |
NOI: |  |  |  |  |
Assets | 1,046,051 |  | 1,046,051 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 5,264 |  |
Seattle [Domain] | Non-same store [Domain] |  |  |  |  |
NOI: |  |  |  |  |
Assets | 226,604 |  | 226,604 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 281 |  |
South Florida [Domain] |  |  |  |  |
Rental income: |  |  |  |  |
Same store | 49,456 | 47,051 | 97,893 | 93,289 |
Segment Reporting Segment Non Same Store Rental Income | 1,241 | 14 | 2,041 | 24 |
Operating expenses: |  |  |  |  |
Same store | 18,220 | 17,774 | 36,404 | 35,417 |
Segment Reporting Segment Non Same Store Operating Expenses | 760 | 68 | 1,301 | 146 |
NOI: |  |  |  |  |
Same store | 31,236 | 29,277 | 61,489 | 57,872 |
Segment Reporting Information Non Same Store Net Operating Income | 481 | (54) | 740 | (122) |
South Florida [Domain] | Same Store [Domain] |  |  |  |  |
NOI: |  |  |  |  |
Assets | 1,170,295 |  | 1,170,295 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 7,600 |  |
South Florida [Domain] | Non-same store [Domain] |  |  |  |  |
NOI: |  |  |  |  |
Assets | 70,896 |  | 70,896 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 16 |  |
Southern California [Domain] |  |  |  |  |
Rental income: |  |  |  |  |
Same store | 104,608 | 100,156 | 207,272 | 198,366 |
Segment Reporting Segment Non Same Store Rental Income | 8,446 | 4,106 | 15,623 | 5,397 |
Operating expenses: |  |  |  |  |
Same store | 34,811 | 34,275 | 69,450 | 69,149 |
Segment Reporting Segment Non Same Store Operating Expenses | 4,261 | 1,976 | 7,452 | 2,593 |
NOI: |  |  |  |  |
Same store | 69,797 | 65,881 | 137,822 | 129,217 |
Segment Reporting Information Non Same Store Net Operating Income | 4,185 | 2,130 | 8,171 | 2,804 |
Southern California [Domain] | Same Store [Domain] |  |  |  |  |
NOI: |  |  |  |  |
Assets | 2,978,750 |  | 2,978,750 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 11,953 |  |
Southern California [Domain] | Non-same store [Domain] |  |  |  |  |
NOI: |  |  |  |  |
Assets | 511,343 |  | 511,343 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 645 |  |
Washington DC [Domain] |  |  |  |  |
Rental income: |  |  |  |  |
Same store | 111,739 | 112,815 | 222,135 | 223,807 |
Segment Reporting Segment Non Same Store Rental Income | 5,906 | 3,512 | 10,840 | 5,320 |
Operating expenses: |  |  |  |  |
Same store | 35,102 | 35,165 | 72,499 | 71,049 |
Segment Reporting Segment Non Same Store Operating Expenses | 1,954 | 1,209 | 3,857 | 1,862 |
NOI: |  |  |  |  |
Same store | 76,637 | 77,650 | 149,636 | 152,758 |
Segment Reporting Information Non Same Store Net Operating Income | 3,952 | 2,303 | 6,983 | 3,458 |
Washington DC [Domain] | Same Store [Domain] |  |  |  |  |
NOI: |  |  |  |  |
Assets | 4,270,418 |  | 4,270,418 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 14,834 |  |
Washington DC [Domain] | Non-same store [Domain] |  |  |  |  |
NOI: |  |  |  |  |
Assets | 306,594 |  | 306,594 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 852 |  |
Non-Core [Domain] |  |  |  |  |
Rental income: |  |  |  |  |
Same store | 33,035 | 32,110 | 65,607 | 63,715 |
Operating expenses: |  |  |  |  |
Same store | 11,806 | 11,880 | 24,495 | 23,931 |
NOI: |  |  |  |  |
Same store | 21,229 | 20,230 | 41,112 | 39,784 |
Non-Core [Domain] | Same Store [Domain] |  |  |  |  |
NOI: |  |  |  |  |
Assets | 605,225 |  | 605,225 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 3,123 |  |
Archstone pre-ownership [Member] |  |  |  |  |
Rental income: |  |  |  |  |
Same store |  |  | 0 | (92,423) |
Operating expenses: |  |  |  |  |
Same store |  |  | 0 | (36,729) |
NOI: |  |  |  |  |
Same store |  |  | 0 | (55,694) |
Other [Domain] |  |  |  |  |
Rental income: |  |  |  |  |
Segment Reporting Segment Non Same Store Rental Income | 3,881 | 2,697 | 6,220 | 4,901 |
Operating expenses: |  |  |  |  |
Segment Reporting Segment Non Same Store Operating Expenses | 2,693 | 3,234 | 7,754 | 13,295 |
NOI: |  |  |  |  |
Segment Reporting Information Non Same Store Net Operating Income | 1,188 | (537) | (1,534) | (8,394) |
Other [Domain] | Non-same store [Domain] |  |  |  |  |
NOI: |  |  |  |  |
Assets | 1,797,443 |  | 1,797,443 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | $ 90 |  |

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