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Organization, Basis of Presentation, and Significant Accounting Policies - Earnings per Common Share (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) community $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares
Basic and diluted shares outstanding |  |  |
Weighted average common shares - basic (in shares) | shares | 139,389,433 | 140,094,722 | 139,054,191
Weighted average DownREIT units outstanding (in shares) | shares | 7,500 | 7,500 | 7,500
Effect of dilutive securities (in shares) | shares | 320,466 | 332,973 | 509,859
Weighted average common shares - diluted (in shares) | shares | 139,717,399 | 140,435,195 | 139,571,550
Calculation of Earnings per Share—basic |  |  |
Net income attributable to common stockholders | $ 1,004,299,000 | $ 827,630,000 | $ 785,974,000
Net income allocated to unvested restricted shares | (2,100,000) | (1,955,000) | (2,063,000)
Net income attributable to common stockholders, adjusted | $ 1,002,199,000 | $ 825,675,000 | $ 783,911,000
Weighted average common shares - basic (in shares) | shares | 139,389,433 | 140,094,722 | 139,054,191
Earnings per common share - basic (in dollars per share) | $ / shares | $ 7.19 | $ 5.89 | $ 5.64
Calculation of Earnings per Share—diluted |  |  |
Net income attributable to common stockholders | $ 1,004,299,000 | $ 827,630,000 | $ 785,974,000
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships, including discontinued operations | 48,000 | 48,000 | 46,000
Adjusted net income attributable to common stockholders | $ 1,004,347,000 | $ 827,678,000 | $ 786,020,000
Weighted average common shares - diluted (in shares) | shares | 139,717,399 | 140,435,195 | 139,571,550
Earnings per common share - diluted (in dollars per share) | $ / shares | $ 7.19 | $ 5.89 | $ 5.63
Casualty Loss, Abandoned Pursuit Costs and Impairment of Long-Lived Assets |  |  |
Abandoned pursuits costs | $ 2,192,000 | $ 12,317,000 | $ 4,896,000
Casualty and impairment loss | 3,119,000 | 0 | 0
Impairment of investment in unconsolidated entities | 0 | 0 | 0
Impairment of long-lived assets held-for-use | $ 0 | 0 | 0
Number of communities held for sale | community | 1 |  |
Uncollectible lease revenue | $ 52,075,000 | 66,763,000 |
New York City, NY |  |  |
Casualty Loss, Abandoned Pursuit Costs and Impairment of Long-Lived Assets |  |  |
Abandoned pursuits costs |  | 7,264,000 |
East Coast | Hurricane and Fire |  |  |
Casualty Loss, Abandoned Pursuit Costs and Impairment of Long-Lived Assets |  |  |
Casualty and impairment loss | 3,119,000 |  |
Land |  |  |
Casualty Loss, Abandoned Pursuit Costs and Impairment of Long-Lived Assets |  |  |
Casualty and impairment loss | $ 0 | $ 0 | $ 0

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- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1505-109256 + Details
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- Definition The average number of limited partnership and general partnership units issued and outstanding that are used in calculating basic and diluted earnings per limited partnership and general partnership unit. + References No definition available. + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1448-109256 + Details
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