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Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Reportable Segments |  |  |  |  |
Assets | $ 23,008,094 |  | $ 23,008,094 |  | $ 22,834,545
Payments to Acquire Other Property, Plant, and Equipment |  |  | 133,181 |  |
Rental income: |  |  |  |  |
Same store | 635,853 | 610,610 | 1,864,729 | 1,792,122 |
Segment Reporting Segment Non Same Store Rental Income | 26,148 | 13,453 | 77,763 | 41,470 |
Segment Reporting Information Revenues | 662,001 | 624,063 | 1,942,492 | 1,741,169 |
Operating expenses: |  |  |  |  |
Same store | 211,344 | 210,081 | 634,076 | 623,298 |
Segment Reporting Segment Non Same Store Operating Expenses | 7,775 | 3,492 | 33,826 | 25,391 |
Segment Reporting Segment Operating Expenses | 219,119 | 213,573 | 667,902 | 611,960 |
NOI: |  |  |  |  |
Same store | 424,509 | 400,529 | 1,230,653 | 1,168,824 |
Segment Reporting Information Non Same Store Net Operating Income | 18,373 | 9,961 | 43,937 | 16,079 |
Segment Reporting Information Net Operating Income | 442,882 | 410,490 | 1,274,590 | 1,129,209 |
Reportable Segments (Textuals) [Abstract] |  |  |  |  |
Units in same store properties | 100,196 |  | 99,686 |  |
Rental income | 662,001 | 624,063 | 1,942,492 | 1,741,169 |
Property Repairs and Maintenance | (120,144) | (118,782) | (361,105) | (330,812) |
Real Estate Taxes and Insurance | (80,568) | (75,916) | (245,717) | (217,753) |
Property management | (18,407) | (18,875) | (61,080) | (63,395) |
Total Operating Expenses | (219,119) | (213,573) | (667,902) | (611,960) |
Archstone [Member] |  |  |  |  |
Reportable Segments (Textuals) [Abstract] |  |  |  |  |
Units in same store properties |  |  | 18,465 |  |
Same Store [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 19,851,704 |  | 19,851,704 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 129,237 |  |
Non-same store [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 3,156,390 |  | 3,156,390 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 3,944 |  |
Boston [Domain] |  |  |  |  |
Rental income: |  |  |  |  |
Same store | 63,485 | 61,687 | 188,509 | 182,143 |
Segment Reporting Segment Non Same Store Rental Income | 931 | 747 | 2,749 | 1,900 |
Operating expenses: |  |  |  |  |
Same store | 19,781 | 19,721 | 61,195 | 59,373 |
Segment Reporting Segment Non Same Store Operating Expenses | 215 | 176 | 639 | 430 |
NOI: |  |  |  |  |
Same store | 43,704 | 41,966 | 127,314 | 122,770 |
Segment Reporting Information Non Same Store Net Operating Income | 716 | 571 | 2,110 | 1,470 |
Boston [Domain] | Same Store [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 1,939,055 |  | 1,939,055 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 14,656 |  |
Boston [Domain] | Non-same store [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 48,570 |  | 48,570 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 690 |  |
Denver [Domain] |  |  |  |  |
Rental income: |  |  |  |  |
Same store | 28,269 | 26,303 | 82,392 | 76,796 |
Operating expenses: |  |  |  |  |
Same store | 8,164 | 8,109 | 23,263 | 23,095 |
NOI: |  |  |  |  |
Same store | 20,105 | 18,194 | 59,129 | 53,701 |
Denver [Domain] | Same Store [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 525,685 |  | 525,685 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 3,900 |  |
New York [Domain] |  |  |  |  |
Rental income: |  |  |  |  |
Same store | 114,968 | 110,588 | 340,374 | 327,884 |
Operating expenses: |  |  |  |  |
Same store | 41,457 | 41,215 | 129,561 | 124,960 |
NOI: |  |  |  |  |
Same store | 73,511 | 69,373 | 210,813 | 202,924 |
New York [Domain] | Same Store [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 4,683,104 |  | 4,683,104 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 14,802 |  |
San Francisco [Domain] |  |  |  |  |
Rental income: |  |  |  |  |
Same store | 86,468 | 79,602 | 251,812 | 232,062 |
Operating expenses: |  |  |  |  |
Same store | 26,938 | 27,312 | 79,898 | 81,417 |
NOI: |  |  |  |  |
Same store | 59,530 | 52,290 | 171,914 | 150,645 |
San Francisco [Domain] | Same Store [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 2,736,460 |  | 2,736,460 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 20,234 |  |
Seattle [Domain] |  |  |  |  |
Rental income: |  |  |  |  |
Same store | 41,575 | 38,786 | 116,581 | 108,789 |
Segment Reporting Segment Non Same Store Rental Income | 2,464 | 0 | 8,608 | 2,855 |
Operating expenses: |  |  |  |  |
Same store | 13,428 | 12,992 | 38,649 | 37,108 |
Segment Reporting Segment Non Same Store Operating Expenses | 645 | 0 | 3,014 | 813 |
NOI: |  |  |  |  |
Same store | 28,147 | 25,794 | 77,932 | 71,681 |
Segment Reporting Information Non Same Store Net Operating Income | 1,819 | 0 | 5,594 | 2,042 |
Seattle [Domain] | Same Store [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 1,039,100 |  | 1,039,100 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 9,699 |  |
Seattle [Domain] | Non-same store [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 226,023 |  | 226,023 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 396 |  |
South Florida [Domain] |  |  |  |  |
Rental income: |  |  |  |  |
Same store | 48,245 | 46,135 | 143,000 | 136,599 |
Segment Reporting Segment Non Same Store Rental Income | 1,645 | 21 | 3,687 | 44 |
Operating expenses: |  |  |  |  |
Same store | 17,805 | 17,673 | 53,347 | 52,238 |
Segment Reporting Segment Non Same Store Operating Expenses | 736 | 218 | 2,113 | 364 |
NOI: |  |  |  |  |
Same store | 30,440 | 28,462 | 89,653 | 84,361 |
Segment Reporting Information Non Same Store Net Operating Income | 909 | (197) | 1,574 | (320) |
South Florida [Domain] | Same Store [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 1,145,788 |  | 1,145,788 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 11,377 |  |
South Florida [Domain] | Non-same store [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 68,528 |  | 68,528 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 0 |  |
Southern California [Domain] |  |  |  |  |
Rental income: |  |  |  |  |
Same store | 106,974 | 102,422 | 314,247 | 300,788 |
Segment Reporting Segment Non Same Store Rental Income | 11,889 | 4,413 | 28,005 | 9,824 |
Operating expenses: |  |  |  |  |
Same store | 35,543 | 35,062 | 104,996 | 104,211 |
Segment Reporting Segment Non Same Store Operating Expenses | 4,653 | 1,962 | 12,737 | 4,554 |
NOI: |  |  |  |  |
Same store | 71,431 | 67,360 | 209,251 | 196,577 |
Segment Reporting Information Non Same Store Net Operating Income | 7,236 | 2,451 | 15,268 | 5,270 |
Southern California [Domain] | Same Store [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 2,955,062 |  | 2,955,062 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 19,125 |  |
Southern California [Domain] | Non-same store [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 754,384 |  | 754,384 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 971 |  |
Washington DC [Domain] |  |  |  |  |
Rental income: |  |  |  |  |
Same store | 114,478 | 114,793 | 335,154 | 337,270 |
Segment Reporting Segment Non Same Store Rental Income | 4,899 | 2,458 | 17,324 | 9,109 |
Operating expenses: |  |  |  |  |
Same store | 36,841 | 36,905 | 108,931 | 107,547 |
Segment Reporting Segment Non Same Store Operating Expenses | 1,654 | 1,003 | 6,005 | 3,276 |
NOI: |  |  |  |  |
Same store | 77,637 | 77,888 | 226,223 | 229,723 |
Segment Reporting Information Non Same Store Net Operating Income | 3,245 | 1,455 | 11,319 | 5,833 |
Washington DC [Domain] | Same Store [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 4,252,450 |  | 4,252,450 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 30,477 |  |
Washington DC [Domain] | Non-same store [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 303,871 |  | 303,871 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 1,290 |  |
Non-Core [Domain] |  |  |  |  |
Rental income: |  |  |  |  |
Same store | 31,391 | 30,294 | 92,660 | 89,791 |
Operating expenses: |  |  |  |  |
Same store | 11,387 | 11,092 | 34,236 | 33,349 |
NOI: |  |  |  |  |
Same store | 20,004 | 19,202 | 58,424 | 56,442 |
Non-Core [Domain] | Same Store [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 575,000 |  | 575,000 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 4,967 |  |
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 | 4,320 | 5,814 | 17,390 | 17,738 |
Operating expenses: |  |  |  |  |
Segment Reporting Segment Non Same Store Operating Expenses | (128) | 133 | 9,318 | 15,954 |
NOI: |  |  |  |  |
Segment Reporting Information Non Same Store Net Operating Income | 4,448 | 5,681 | 8,072 | 1,784 |
Other [Domain] | Non-same store [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 1,755,014 |  | 1,755,014 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | $ 597 |  |

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