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Leases and Management Agreements with Five Star - Schedule of Assets Leased and Revenues Earned (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value of Investment | $ 7,824,763 |  |  |  | $ 7,617,547 |  |  |  | $ 7,824,763 | $ 7,617,547 |
Revenues | 278,566 | $ 266,679 | $ 265,013 | $ 264,561 | 274,296 | $ 263,983 | $ 261,367 | $ 258,375 | 1,074,819 | 1,058,022 | $ 998,773
Real Estate Investment Property At Cost | Rents from significant lessee |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value of Investment | 8,474,950 |  |  |  | 8,251,964 |  |  |  | $ 8,474,950 | $ 8,251,964 |
Concentration of credit risk (as a percent) |  |  |  |  |  |  |  |  | 100.00% | 100.00% |
Sales Revenue, Services, Net | Rents from significant lessee |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 1,074,819 | $ 1,058,022 |
Concentration of credit risk (as a percent) |  |  |  |  |  |  |  |  | 100.00% | 100.00% |
Five Star | Real Estate Investment Property At Cost | Rents from significant lessee |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value of Investment | 2,330,630 |  |  |  | 2,290,029 |  |  |  | $ 2,330,630 | $ 2,290,029 |
Concentration of credit risk (as a percent) |  |  |  |  |  |  |  |  | 27.50% | 27.80% |
Five Star | Sales Revenue, Services, Net | Rents from significant lessee |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 210,539 | $ 203,581 |
Concentration of credit risk (as a percent) |  |  |  |  |  |  |  |  | 19.60% | 19.20% |
All others | Real Estate Investment Property At Cost | Rents from significant lessee |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value of Investment | $ 6,144,320 |  |  |  | $ 5,961,935 |  |  |  | $ 6,144,320 | $ 5,961,935 |
Concentration of credit risk (as a percent) |  |  |  |  |  |  |  |  | 72.50% | 72.20% |
All others | Sales Revenue, Services, Net | Rents from significant lessee |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 864,280 | $ 854,441 |
Concentration of credit risk (as a percent) |  |  |  |  |  |  |  |  | 80.40% | 80.80% |

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