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Fair Value Measurements - Narrative (Details) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2021 USD ($) | Jul. 26, 2020 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) community lease | Dec. 31, 2021 USD ($) community | Dec. 31, 2020 USD ($) community
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Marketable securities |  |  | $ 48,680 | $ 182,393 |
Investment in unconsolidated ventures |  |  | 55,333 | 67,424 |
Cost of the capped call transactions |  |  | 0 | 15,916 | $ 0
Long-term debt |  |  | 3,850,142 | 3,841,212 |
Long-term debt, fair value |  |  | $ 3,400,000 | $ 3,400,000 |
Number of communities leased | lease |  |  | 246 |  |
Health Care Services | Securities Purchase Agreement | HCA Healthcare, Inc. |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investment in unconsolidated ventures | $ 100,000 |  |  |  |
Percentage of ownership after transaction | 20.00% |  | 20.00% |  |
Purchase price | $ 400,000 |  |  |  |
Condensed Consolidated Balance Sheet |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Number of communities leased | community |  |  | 8 | 11 | 42
Estimated fair value |  |  | $ 30,900 | $ 31,000 | $ 117,900
Ventas, Inc | The Warrant |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Number of shares authorized to be purchased | shares |  | 16,300,000 |  |  |
Share price (in usd per share) | $ / shares |  | $ 3.00 |  |  |
Issuance of warrants |  | $ 22,900 |  |  |
Volatility rate |  | 65.00% |  |  |
Reported Value Measurement |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Long-term debt |  |  | 3,900,000 | 3,800,000 |
Level 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Marketable securities |  |  | 48,700 | 182,400 |
Level 2 | Interest Rate Cap |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Current notional balance |  |  | 1,231,920 |  |
Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Operating lease right-of-use assets |  |  | 13,700 | 16,600 | 76,300
Property, plant and equipment impairment |  |  | $ 15,900 | $ 6,400 | $ 29,300

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