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Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |
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Jan. 14, 2022 $ / shares | Oct. 08, 2021 $ / shares | Jul. 09, 2021 $ / shares | Apr. 09, 2021 $ / shares | Jan. 08, 2021 $ / shares | Oct. 09, 2020 $ / shares | Jul. 10, 2020 $ / shares | Apr. 10, 2020 $ / shares | Jan. 10, 2020 $ / shares | Oct. 15, 2019 | Oct. 11, 2019 $ / shares | Jul. 12, 2019 $ / shares | Apr. 12, 2019 $ / shares | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock split ratio |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Intangibles including goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 55,400 | $ 12,500 |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,000 | 4,700 |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,400 |  |  |  |
Accumulated amortization of identified intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,300 | 3,200 |  |  |
Expected to be recognized in year one |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,200 |  |  |  |
Expected to be recognized in year two |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,200 |  |  |  |
Expected to be recognized in year three |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,200 |  |  |  |
Expected to be recognized in year four |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,200 |  |  |  |
Expected to be recognized in year five |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,200 |  |  |  |
Remaining useful life |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |
Cash and cash equivalents, restricted cash |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 29,300 | 24,100 |  |  |
Deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 28,900 | 27,900 |  |  |
Estimated membership upgrade contract term |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |  |  |
OP units to common stock exchange ratio |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Operating loss carryforwards |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,900 | 74,100 |  |  |
Net operating loss carryforward offset tax |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,200 |  |  |  |
Aggregate cost in real estate U.S federal tax basis |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,600,000 |  |  |  |
Net investment in notes receivable U.S federal tax basis |  |  |  |  |  |  |  |  |  |  |  |  |  | 46,200 |  |  |  |
Quarterly distribution paid per common share (usd per share) | $ / shares |  | $ 0.3625 | $ 0.3625 | $ 0.3625 | $ 0.3425 | $ 0.3425 | $ 0.3425 | $ 0.3425 | $ 0.3063 |  | $ 0.3063 | $ 0.3063 | $ 0.3063 |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,486,171 | $ 1,304,755 |  | $ 1,321,888 | $ 1,193,344
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly distribution paid per common share (usd per share) | $ / shares | $ 0.3625 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly distribution for tax purposes (usd per share) | $ / shares | $ 0.3625 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessor operating lease term |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 month |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessor operating lease term |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (3,900) | $ (3,875) |
2020 Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly distribution paid per common share (usd per share) | $ / shares |  |  |  |  | $ 0.087801 |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Partnership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 95.20% |  |  |  |

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