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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, 2022 USD ($) community $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares
Basic and diluted shares outstanding |  |  |
Weighted average common shares - basic (in shares) | shares | 139,634,294 | 139,389,433 | 140,094,722
Weighted average DownREIT units outstanding (in shares) | shares | 7,500 | 7,500 | 7,500
Effect of dilutive securities (in shares) | shares | 333,293 | 320,466 | 332,973
Weighted average common shares - diluted (in shares) | shares | 139,975,087 | 139,717,399 | 140,435,195
Calculation of Earnings per Share—basic |  |  |
Net income attributable to common stockholders | $ 1,136,775,000 | $ 1,004,299,000 | $ 827,630,000
Net income allocated to unvested restricted shares | (2,091,000) | (2,100,000) | (1,955,000)
Net income attributable to common stockholders—basic | $ 1,134,684,000 | $ 1,002,199,000 | $ 825,675,000
Weighted average common shares - basic (in shares) | shares | 139,634,294 | 139,389,433 | 140,094,722
Earnings per common share - basic (in dollars per share) | $ / shares | $ 8.13 | $ 7.19 | $ 5.89
Calculation of Earnings per Share—diluted |  |  |
Net income attributable to common stockholders | $ 1,136,775,000 | $ 1,004,299,000 | $ 827,630,000
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships, including discontinued operations | 48,000 | 48,000 | 48,000
Net income attributable to common stockholders—diluted | $ 1,136,823,000 | $ 1,004,347,000 | $ 827,678,000
Weighted average common shares - diluted (in shares) | shares | 139,975,087 | 139,717,399 | 140,435,195
Earnings per common share - diluted (in dollars per share) | $ / shares | $ 8.12 | $ 7.19 | $ 5.89
Antidilutive securities excluded from computation of earnings per share | shares | 291,881 |  |
Casualty Loss, Abandoned Pursuit Costs and Impairment of Long-Lived Assets |  |  |
Abandoned pursuits costs | $ 16,565,000 | $ 2,192,000 | $ 12,317,000
Impairment of long-lived assets held-for-use | 0 | 0 | 0
Casualty loss | 0 | 3,119,000 | 0
Impairment of investment in unconsolidated entities | $ 0 | 0 | 0
Number of communities held for sale | community | 0 |  |
Uncollectible lease revenue | $ 49,147,000 | 52,075,000 | 66,763,000
Pacific Northwest and Southern California |  |  |
Casualty Loss, Abandoned Pursuit Costs and Impairment of Long-Lived Assets |  |  |
Abandoned pursuits costs | $ 10,073,000 |  |
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 loss |  | $ 3,119,000 |

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