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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue Recognition |  |  |  |  |
Term of residency agreements - minimum | 30 days |  |  |  |
Term of residency agreements - maximum | 1 year |  |  |  |
Stock-Based Compensation |  |  |  |  |
Award vesting period | 3 years |  |  |  |
Weighted average volatility rate | 42.50% | 45.20% |  |  |
Risk free interest rate | 1.40% | 2.40% |  |  |
Accounting Standards Update and Change in Accounting Principle |  |  |  |  |
Operating lease liabilities | $ 965,655 |  |  |  |
Operating lease right-of-use assets | 788,138 | $ 1,159,738 |  |  |
Cumulative effect of change in accounting principle | 802,729 | 698,725 |  | $ 1,018,413 | $ 1,530,291
Deferred tax position | 9,557 | 15,397 |  |  |
Change in valuation allowance | 380,990 | 408,903 |  |  |
Accumulated Deficit |  |  |  |  |
Accounting Standards Update and Change in Accounting Principle |  |  |  |  |
Cumulative effect of change in accounting principle | $ (3,311,184) | (3,393,088) |  | (3,069,272) | (2,541,294)
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit |  |  |  |  |
Accounting Standards Update and Change in Accounting Principle |  |  |  |  |
Cumulative effect of change in accounting principle |  | (115) |  | (55,885) | $ 0
ASU 2016-02 |  |  |  |  |
Accounting Standards Update and Change in Accounting Principle |  |  |  |  |
Operating lease liabilities |  |  | $ 1,618,000 | 231,400 |
Operating lease right-of-use assets |  |  | 1,329,000 |  |
Cumulative effect of change in accounting principle |  |  | (56,000) |  |
Right of use assets impairment loss |  | $ 10,200 |  |  |
Deferred tax position |  |  |  | 300 |
Deferred tax assets |  |  |  | 14,100 |
Change in valuation allowance |  |  |  | $ 13,800 |
ASU 2016-02 | Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit |  |  |  |  |
Accounting Standards Update and Change in Accounting Principle |  |  |  |  |
Cumulative effect of change in accounting principle |  |  | $ 58,100 |  |
Minimum |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Award vesting period | 3 years |  |  |  |
Award vesting rights percentage | 0.00% |  |  |  |
Fair value vesting rights, percentage | 0.00% |  |  |  |
Maximum |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Award vesting period | 4 years |  |  |  |
Award vesting rights percentage | 125.00% |  |  |  |
Fair value vesting rights, percentage | 150.00% |  |  |  |

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