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Loans Receivable - Narrative (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended | 15 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 28, 2022 USD ($) | Sep. 30, 2021 USD ($) | Jul. 31, 2021 USD ($) | Jun. 30, 2021 USD ($) property | May 31, 2021 USD ($) property | Apr. 30, 2021 USD ($) property | Jan. 31, 2021 USD ($) property | Mar. 31, 2022 USD ($) | Jun. 30, 2021 USD ($) property | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) property | Dec. 31, 2021 USD ($) loan | Mar. 31, 2022 USD ($) | Dec. 31, 2020 USD ($)
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash provided by financing activities |  |  |  |  |  |  |  | $ (18,511,000) |  | $ (924,119,000) |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  |  | 3,856,000 |  | 0 |  |  |  |  |
Financing receivable, after allowance for credit loss |  |  |  |  |  |  |  | 409,753,000 |  |  | $ 415,811,000 | $ 415,811,000 | $ 415,811,000 | $ 409,753,000 |
Reserves for loans receivable |  |  |  |  |  |  |  | 1,944,000 |  |  | 1,813,000 | $ 1,813,000 | $ 1,813,000 | 1,944,000 | $ 10,280,000
Number of loans sold |  |  |  |  |  |  |  |  |  |  |  | 6 | 2 |  |
Proceeds from sale of receivables |  |  |  |  |  |  |  |  |  |  | 53,000,000 |  |  |  |
Gain (loss) on sale of financing receivable |  |  |  |  |  |  |  | 23,000,000 |  |  |  |  |  |  |
Credit loss reserve on unfunded loan commitments |  |  |  |  |  |  |  | 300,000 |  |  | 300,000 | $ 300,000 | $ 300,000 | 300,000 |
Sunrise Senior Housing Portfolio | SHOP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash provided by financing activities |  |  |  |  |  |  | $ 410,000,000 |  |  |  |  |  |  |  |
Capital expenditure funding, amount committed | $ 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 |
Secured mortgage loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, gross |  |  |  |  |  |  |  | 388,746,000 |  |  | 396,281,000 | 396,281,000 | 396,281,000 | 388,746,000 |
Secured Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves for loans receivable |  |  |  |  |  |  |  | 1,938,000 |  |  | 1,804,000 | $ 1,804,000 | 1,804,000 | 1,938,000 | $ 3,152,000
SHOP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  | 16 |  |  |  |  | 15 |  |  |
SHOP | Sunrise Senior Housing Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  | 32 |  |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  |  |  |  | $ 664,000,000 |  |  |  |  |  |  |  |
Proceeds from the collection of loans receivable | $ 8,000,000 |  |  | $ 246,000,000 |  |  |  |  |  |  |  |  |  |  |
Financing receivable, after allowance for credit loss |  |  |  |  |  |  |  | 157,000,000 |  |  | 165,000,000 | $ 165,000,000 | 165,000,000 | 157,000,000 |
SHOP | Discovery SHOP Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |
SHOP | Secured Loans | Discovery SHOP Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans held for sale | property |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Number of loans sold | property |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Gain (loss) on sale of financing receivable |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |
Secured mortgage loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans held for sale | property |  |  |  | 2 |  |  |  |  | 2 |  |  |  |  |  |
Financing receivable, gross |  |  |  | $ 64,000,000 |  |  |  |  | $ 64,000,000 |  |  |  |  |  |
Decrease in financing receivable |  |  |  |  |  |  |  |  | 11,000,000 |  |  |  |  |  |
Financing receivable, after allowance for credit loss |  |  |  | 53,000,000 |  |  |  |  | 53,000,000 |  |  |  |  |  |
Reserves for loans receivable |  |  |  | $ 8,000,000 |  |  |  |  | $ 8,000,000 |  |  |  |  |  |
Principal repayments received |  | $ 15,000,000 | $ 8,000,000 |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |
Number of loans receivable | property |  |  |  |  | 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 |  | $ 2,000,000 |  |  |  |  |
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 | Lessor Asset Under Operating Lease | Brookedale MTCA | Other Non-Reporting Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, after allowance for credit loss |  |  |  |  |  |  |  | $ 25,000,000 |  |  | $ 24,000,000 | $ 24,000,000 | $ 24,000,000 | $ 25,000,000 |

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