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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Mar. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Cumulative effect adjustment to equity |  | $ 5,071,168 |  | $ 5,071,168 |  | $ 5,301,005 |
RIDEA II |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investment ownership percentage |  | 40.00% |  | 40.00% |  |  | 40.00%
Equity method investments | $ 121,000 |  |  |  |  |  |
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Cumulative effect adjustment to equity | 79,000 |  |  |  |  |  |
Impairment charge | 30,000 |  |  |  |  |  |
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 | RIDEA II |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Fair value of equity method investments | $ 107,000 |  |  |  |  |  |
Ancillary service revenue | ASU 2014-09 |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Tenant recoveries and Resident fees and services |  | $ 10,000 | $ 9,000 | $ 30,000 | $ 28,000 |  |

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