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Impairments - Equity Method Investments (Details) £ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 | Dec. 31, 2015 GBP (£) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 GBP (£) | Sep. 30, 2015 USD ($) | Feb. 28, 2015 USD ($)
Investment Impairments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of direct financing leases |  |  |  | $ 7,280,334,000 |  |  |  |  | $ 7,280,334,000 |  |  | $ 5,905,009,000 |  |  |
Other than temporary impairment charge |  |  |  |  |  |  |  | $ 45,895,000 | 35,913,000 |  |  |  |  |  |
Held-to-maturity debt securities, principal balance |  |  |  | 231,442,000 |  |  |  |  | 231,442,000 |  |  | 102,958,000 |  |  |
Four Seasons |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Impairments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held-to-maturity debt securities, principal balance |  |  |  |  |  |  |  |  |  |  | £ 58 | 85,000,000 |  |  |
Four Seasons | Discounted cash flow valuation technique | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Impairments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment charge |  |  |  |  |  | $ 70,000,000 | $ 42,000,000 |  |  |  |  |  |  |  |
Held-to-maturity debt securities, principal balance |  |  |  |  |  |  |  |  |  |  |  |  | £ 66 | $ 100,000,000 |
HCRMC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Impairments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment charge | $ 19,000,000 |  |  |  |  | $ 27,000,000 |  | $ 19,000,000 | 36,000,000 |  |  |  |  |  |
Carrying value, equity method investments |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Carrying value, equity method investments before impairment |  |  |  | 75,000,000 |  |  |  |  | 75,000,000 |  |  |  |  | 48,000,000 |
Fair value of investment |  |  |  | 39,000,000 |  |  |  |  | 39,000,000 |  |  |  |  | 21,000,000 |
HCRMC | Discounted cash flow valuation technique |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Impairments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value, equity method investments |  |  |  | 39,500,000 |  |  |  |  | $ 39,500,000 |  |  |  |  |  |
Fair Value Quantitative Inputs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount Rate |  |  |  |  |  |  |  |  | 13.70% |  |  |  |  |  |
HCRMC | Discounted cash flow valuation technique | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Impairments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of investment |  |  |  | 35,000,000 |  |  |  |  | $ 35,000,000 |  |  |  |  |  |
Fair Value Quantitative Inputs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Range of revenue growth rate |  |  |  |  |  |  |  |  | (0.20%) |  |  |  |  |  |
Range of occupancy growth rates |  |  |  |  |  |  |  |  | (0.30%) |  |  |  |  |  |
Range of operating expense growth rates |  |  |  |  |  |  |  |  | 0.60% |  |  |  |  |  |
Range of earnings multiples |  |  |  |  |  |  |  |  | 6.0 |  |  |  |  |  |
HCRMC | Discounted cash flow valuation technique | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Impairments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of investment |  |  |  | 44,000,000 |  |  |  |  | $ 44,000,000 |  |  |  |  |  |
Fair Value Quantitative Inputs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Range of revenue growth rate |  |  |  |  |  |  |  |  | 3.50% |  |  |  |  |  |
Range of occupancy growth rates |  |  |  |  |  |  |  |  | 0.20% |  |  |  |  |  |
Range of operating expense growth rates |  |  |  |  |  |  |  |  | 2.80% |  |  |  |  |  |
Range of earnings multiples |  |  |  |  |  |  |  |  | 7.0 |  |  |  |  |  |
HCRMC | Discounted cash flow valuation technique | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Impairments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Leasehold |  |  | $ 478,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Quantitative Inputs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount Rate |  |  |  |  |  |  |  | 15.20% |  |  |  |  |  |  |
HCRMC | Discounted cash flow valuation technique | Level 3 | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Quantitative Inputs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Range of revenue growth rate |  |  |  |  |  |  |  | (1.80%) |  |  |  |  |  |  |
Range of occupancy growth rates |  |  |  |  |  |  |  | (0.80%) |  |  |  |  |  |  |
Range of operating expense growth rates |  |  |  |  |  |  |  | (1.10%) |  |  |  |  |  |  |
Range of earnings multiples |  |  |  |  |  |  |  | 6.0 |  |  |  |  |  |  |
HCRMC | Discounted cash flow valuation technique | Level 3 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Quantitative Inputs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Range of revenue growth rate |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |
Range of occupancy growth rates |  |  |  |  |  |  |  | 0.20% |  |  |  |  |  |  |
Range of operating expense growth rates |  |  |  |  |  |  |  | 3.10% |  |  |  |  |  |  |
Range of earnings multiples |  |  |  |  |  |  |  | 7.0 |  |  |  |  |  |  |
HCRMC in Master Lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Impairments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of direct financing leases |  |  | 6,100,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 6,600,000,000
HCRMC in Master Lease | DFL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Impairments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Leasehold |  |  | $ 478,000,000 |  | $ 817,000,000 |  |  |  |  |  |  |  |  |  |
Carrying value of direct financing leases |  |  |  |  |  |  |  |  |  |  |  | 5,200,000,000 |  | $ 6,000,000,000 |
Senior housing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Impairments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of direct financing leases |  |  |  |  |  |  |  |  |  |  |  | 1,788,764,000 |  |  |
Other than temporary impairment charge | $ 19,000,000 | $ 27,000,000 |  | 36,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior housing | DFL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Impairments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of direct financing leases |  |  |  | $ 370,000,000 |  |  |  |  | $ 370,000,000 |  |  | 366,000,000 |  |  |
Senior housing | HCRMC in Master Lease | DFL | Income approach | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Quantitative Inputs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EBITDAR |  |  |  |  |  |  |  | $ 75,000,000 |  |  |  |  |  |  |
Rent Coverage Ratio |  |  |  |  |  |  |  | 1.05 |  |  |  |  |  |  |
Real Estate Capitalized rate |  |  |  |  |  |  |  |  |  | 6.25% |  |  |  |  |
Senior housing | HCRMC in Master Lease | DFL | Income approach | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Quantitative Inputs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EBITDAR |  |  |  |  |  |  |  | $ 85,000,000 |  |  |  |  |  |  |
Rent Coverage Ratio |  |  |  |  |  |  |  | 1.15 |  |  |  |  |  |  |
Real Estate Capitalized rate |  |  |  |  |  |  |  | 7.25% |  |  |  |  |  |  |
Senior housing | HCRMC in Master Lease | DFL | Market approach | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Quantitative Inputs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flow coverage ratio |  |  |  |  |  |  |  |  |  | 1.05% |  |  |  |  |
Post-acute/skilled |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Impairments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of direct financing leases |  |  |  |  |  |  |  |  |  |  |  | $ 3,992,354,000 |  |  |
Post-acute/skilled | HCRMC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Impairments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  |  |  |  |  |  |  |  |  |  | 9.00% | 9.00% |  |  |
Post-acute/skilled | HCRMC in Master Lease | DFL | Income approach |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Quantitative Inputs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EBITDAR |  |  |  |  |  |  |  | $ 435,000,000 |  |  |  |  |  |  |
Post-acute/skilled | HCRMC in Master Lease | DFL | Income approach | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Quantitative Inputs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EBITDAR |  |  |  |  |  |  |  | $ 385,000,000 |  |  |  |  |  |  |
Rent Coverage Ratio |  |  |  |  |  |  |  | 1.25 |  |  |  |  |  |  |
Real Estate Capitalized rate |  |  |  |  |  |  |  |  |  | 7.50% |  |  |  |  |
Post-acute/skilled | HCRMC in Master Lease | DFL | Income approach | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Quantitative Inputs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rent Coverage Ratio |  |  |  |  |  |  |  | 1.35 |  |  |  |  |  |  |
Real Estate Capitalized rate |  |  |  |  |  |  |  | 8.50% |  |  |  |  |  |  |
Post-acute/skilled | HCRMC in Master Lease | DFL | Market approach | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Quantitative Inputs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flow coverage ratio |  |  |  |  |  |  |  |  |  | 1.25% |  |  |  |  |

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