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Loans Receivable - Narrative (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 21 Months Ended |
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Jul. 31, 2022 USD ($) | May 31, 2022 USD ($) | Feb. 28, 2022 USD ($) | Nov. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) loan | Jul. 31, 2021 USD ($) | Jun. 30, 2021 USD ($) loan | May 31, 2021 USD ($) loan | Apr. 30, 2021 USD ($) loan property | Jan. 31, 2021 USD ($) facility | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) loan | Mar. 31, 2021 USD ($) | Sep. 30, 2022 USD ($) loan | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) loan | Sep. 30, 2022 USD ($) | Dec. 31, 2020 USD ($)
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash provided by financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (165,517,000) | $ (1,687,889,000) |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  |  |  |  |  | $ (4,149,000) |  | $ 14,635,000 |  |  | 10,047,000 | 189,873,000 |  |  |
Financing receivable, after allowance for credit loss |  |  |  |  |  |  |  |  |  |  | 383,991,000 |  |  |  |  | 383,991,000 |  | $ 415,811,000 | $ 383,991,000 |
Reserves for loans receivable |  |  |  |  |  |  |  |  |  |  | 5,115,000 |  |  |  |  | $ 5,115,000 |  | $ 1,813,000 | 5,115,000 | $ 10,280,000
Gain (loss) on sale of financing receivable |  |  |  |  |  |  |  |  |  |  |  | $ 23,000,000 |  |  |  |  |  |  |  |
Number of loans sold | loan |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  | 1 |  | 6 |  |
Proceeds from sale of receivables |  |  |  | $ 51,000,000 | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit loss reserve on unfunded loan commitments |  |  |  |  |  |  |  |  |  |  | 700,000 |  |  |  |  | $ 700,000 |  | $ 300,000 | 700,000 |
Sunrise Senior Housing Portfolio | SHOP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash provided by financing activities |  |  |  |  |  |  |  |  |  | $ 410,000,000 |  |  |  |  |  |  |  |  |  |
Capital expenditure funding, amount committed | $ 40,000,000 |  | $ 47,000,000 |  |  |  | $ 56,000,000 |  |  | $ 92,000,000 |  |  |  |  |  |  |  |  |  |
Capital expenditure funding, cost of capital, percent committed |  |  |  |  |  |  |  |  |  | 65.00% |  |  |  |  |  |  |  |  |  |
Capital expenditure funding, amount funded |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 |
Mezzanine and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves for loans receivable |  |  |  |  |  |  |  |  |  |  | 16,000 |  |  |  |  | 16,000 |  | 9,000 | 16,000 | $ 7,128,000
SHOP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | facility |  |  |  |  |  |  |  |  |  | 16 |  |  |  |  |  |  |  |  |  |
SHOP | Sunrise Senior Housing Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | facility |  |  |  |  |  |  |  |  |  | 32 |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  | $ 664,000,000 |  |  |  |  |  |  |  |  |  |
Proceeds from the collection of loans receivable | $ 27,000,000 |  | $ 8,000,000 |  |  |  | 246,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  | 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, after allowance for credit loss |  |  |  |  |  |  |  |  |  |  | 130,000,000 |  |  |  |  | 130,000,000 |  | 165,000,000 | 130,000,000 |
SHOP | Discovery SHOP Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |
SHOP | Mezzanine and Other | Discovery SHOP Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans held for sale | loan |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of financing receivable |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |
Number of loans sold | property |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Secured mortgage loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, after allowance for credit loss |  |  |  |  |  |  | $ 53,000,000 |  |  |  |  |  |  | $ 53,000,000 |  |  |  |  |  |
Principal repayments received |  | $ 2,000,000 |  |  | $ 15,000,000 | $ 8,000,000 |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of loans held for sale | loan |  |  |  |  |  |  | 2 |  |  |  |  |  |  | 2 |  |  |  |  |  |
Financing receivable, gross |  |  |  |  |  |  | $ 64,000,000 |  |  |  |  |  |  | $ 64,000,000 |  |  |  |  |  |
Decrease in financing receivable |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,000,000 |  |  |  |  |  |
Reserves for loans receivable |  |  |  |  |  |  | $ 8,000,000 |  |  |  |  |  |  | $ 8,000,000 |  |  |  |  |  |
Gain (loss) on sale of financing receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,000,000) |  |  |
Number of loans receivable | loan |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
SHOP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  | 230,000,000 |  |  |  |  |  |  |  |  |  |
Net cash provided by financing activities |  |  |  |  |  |  |  |  |  | 150,000,000 |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  |  |  |  | $ 59,000,000 |  |  |  |  | $ 16,000,000 |  |  |  |  |
Loans receivable, market rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.25% |  |  |  |  |
Non-cash interest income |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  | $ 1,000,000 |  |  | 3,000,000 | 12,000,000 |  |  |
Noncash interest income, acceleration recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,000,000 |  |  |
SHOP | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.50% |  |  |  |  |
Interest income, amortization period (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |
SHOP | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.50% |  |  |  |  |
Interest income, amortization period (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
SHOP | Discovery SHOP Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  |  |  |  |  |  | $ 334,000,000 |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  |  |  | $ 9,000,000 |  |  |  |  |  |  |  |  |  |  |
CCRC JV | Brookedale MTCA | Other Non-Reporting Segment | Lessor Asset Under Operating Lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, after allowance for credit loss |  |  |  |  |  |  |  |  |  |  | $ 29,000,000 |  |  |  |  | $ 29,000,000 |  | $ 24,000,000 | $ 29,000,000 |

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