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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, 2021 USD ($) lease community | Dec. 31, 2020 USD ($) community | Dec. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) community | Jun. 30, 2020 USD ($) community | Mar. 31, 2020 USD ($) community | Jan. 01, 2019 USD ($) community | Dec. 31, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Marketable securities |  |  | $ 182,393 | $ 172,905 |  |  |  |  |  |
investment in unconsolidated ventures |  |  | 67,424 | 4,898 |  |  |  |  |  |
Debt |  |  | $ 3,841,212 | 3,915,988 |  |  |  |  |  |
Number of communities leased | lease |  |  | 233 |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  | $ 699,623 | 802,729 | $ 698,725 |  |  |  |  | $ 1,018,413
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 |  |  |  |  |  |  |  |  |
Accumulated Deficit |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  | $ (3,410,474) | (3,311,184) | (3,393,088) |  |  |  |  | (3,069,272)
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  | $ 0 | (115) |  |  |  |  | $ (55,885)
Condensed Consolidated Balance Sheet |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Number of communities leased | community |  |  | 11 | 5 |  | 2 | 9 | 35 | 25 |
Estimated fair value |  |  | $ 31,000 | $ 2,300 |  | $ 3,000 | $ 10,300 | $ 106,700 | $ 56,600 |
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] |  |  |  |  |  |  |  |  |  |
Debt |  |  | 3,800,000 | 3,900,000 |  |  |  |  |  |
Level 2 |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Marketable securities |  |  | 182,400 |  |  |  |  |  |  |
Nonrecurring |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  | 16,600 | 76,300 | 10,200 |  |  |  |  |
Property, plant and equipment impairment |  |  | $ 6,400 | $ 29,300 | $ 27,200 |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Discount rate |  |  | 9.00% |  |  |  |  |  |  |
Minimum | Level 3 |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Capitalization rate |  |  | 7.00% |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Discount rate |  |  | 12.30% |  |  |  |  |  |  |
Maximum | Level 3 |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Capitalization rate |  |  | 9.00% |  |  |  |  |  |  |
ASU 2016-02 |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
investment in unconsolidated ventures |  |  |  |  |  |  |  |  | (2,000) |
Cumulative effect of change in accounting principle |  |  |  |  |  |  |  |  | (56,000) |
ASU 2016-02 | Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  |  |  |  |  | $ 58,100 |

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