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Commitments and Contingencies - Narrative (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) community multiplier Lease property | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Commitments and Contingencies Disclosure [Line Items] |  |  |
Proceeds from legal recoveries | $ 0 | $ 0 | $ (6,292,000)
Payments to acquire other real estate | 771,692,000 | 0 | 420,517,000
Right of use lease assets | 118,370,000 | 133,581,000 |
Total lease liabilities | 146,377,000 | 161,313,000 |
Operating lease, expense | 15,458,000 | 16,011,000 | 14,371,000
Finance lease, right-of-use asset | $ 28,229,000 | 21,685,000 |
Lease Obligations [Abstract] |  |  |
Number of real estate properties | community | 278 |  |
Number of office leases | Lease | 13 |  |
Total lease liabilities | $ 20,120,000 | $ 20,166,000 |
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Right of use lease assets | Right of use lease assets |
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Lease liabilities | Lease liabilities |
Properties on Land Subject to Land Leases |  |  |
Lease Obligations [Abstract] |  |  |
Number of real estate properties | community | 7 |  |
Number of commercial properties owned | property | 2 |  |
Assets Held under Operating Leases |  |  |
Lease Obligations [Abstract] |  |  |
Number of real estate properties | community | 6 |  |
Assets Held under Finance Leases |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Number of finance leases for parking garages adjacent to communities | Lease | 4 |  |
Lease Obligations [Abstract] |  |  |
Number of real estate properties | community | 1 |  |
Restricted stock and stock options |  |  |
Employment Agreements and Arrangements [Abstract] |  |  |
Retirement age (in years) | 50 years |  |
Period of the non-compete agreement (in years) | 1 year |  |
Restricted stock and stock options | Minimum |  |  |
Employment Agreements and Arrangements [Abstract] |  |  |
Service period (in years) | 10 years |  |
Employee's age at retirement plus years of employment (in years) | 70 years |  |
Share Based Compensation Arrangement by Share Based Payment Award Requisite Period of Written Notice for Retirement | 6 months |  |
Restricted stock and stock options | Maximum |  |  |
Employment Agreements and Arrangements [Abstract] |  |  |
Options exercise period upon termination without cause or retirement (in months) | 12 months |  |
Officer Severance Program | Vice President and Senior Vice President |  |  |
Employment Agreements and Arrangements [Abstract] |  |  |
Compensation multiplier | multiplier | 1 |  |
Officer Severance Program | Executive Vice Presidents |  |  |
Employment Agreements and Arrangements [Abstract] |  |  |
Compensation multiplier | multiplier | 2 |  |
Officer Severance Program | Chief Executive Officer |  |  |
Employment Agreements and Arrangements [Abstract] |  |  |
Compensation multiplier | multiplier | 3 |  |
Officer Severance Program | Maximum |  |  |
Employment Agreements and Arrangements [Abstract] |  |  |
Termination period following a sale event (in years) | 24 months |  |
Former Development Right |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Proceeds from legal recoveries |  |  | (3,126,000)
Avalon Towers |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Proceeds from legal recoveries |  |  | $ (2,237,000)
Avalon Hackensack at Riverside |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Payments to acquire other real estate | $ 10,336,000 |  |

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