Debt (Details) £ in Millions | Mar. 01, 2015USD ($) | Jan. 21, 2015USD ($) | Jan. 12, 2015GBP (£) | Aug. 14, 2014USD ($) | Jun. 14, 2014USD ($) | Feb. 21, 2014USD ($) | Feb. 01, 2014USD ($) | Jun. 30, 2015USD ($) | Jun. 30, 2015GBP (£)item | Jun. 30, 2015USD ($)item | Dec. 31, 2014USD ($) |
Debt Instrument | | | | | | | | | | | |
Bank line of credit | | | | | | | | | | $ 1,022,324,000 | $ 838,516,000 |
Debt instruments, carrying amount | | | | | | | | | | 11,118,214,000 | |
Senior unsecured notes | | | | | | | | | | 8,567,293,000 | 7,626,194,000 |
2015 (Nine months) | | | | | | | | | | 22,172,000 | |
2,016 | | | | | | | | | | 1,407,709,000 | |
2,017 | | | | | | | | | | 1,331,891,000 | |
2,018 | | | | | | | | | | 1,628,907,000 | |
2,019 | | | | | | | | | | 798,110,000 | |
Thereafter | | | | | | | | | | 5,963,170,000 | |
Total debt before discount, net | | | | | | | | | | 11,151,959,000 | |
Discounts, net | | | | | | | | | | (33,745,000) | |
Other debt | | | | | | | | | | $ 95,144,000 | $ 97,022,000 |
Number of CCRC issuing non-interest life care bonds | item | | | | | | | | | 2 | 2 | |
Number of facilities with non-interest bearing occupancy fee deposits | item | | | | | | | | | 2 | 2 | |
Interest-rate swap contracts | | | | | | | | | | | |
Debt Instrument | | | | | | | | | | | |
Term of the interest rate swap agreement | | | 3 years | | | | | | | | |
Line of Credit and Term Loan | | | | | | | | | | | |
Debt Instrument | | | | | | | | | | | |
Debt instrument, covenant debt to assets (as a percent) | | | | | | | | | 60.00% | 60.00% | |
Debt instrument, covenant secured debt to assets (as a percent) | | | | | | | | | 30.00% | 30.00% | |
Debt instrument, covenant unsecured debt to unencumbered assets (as a percent) | | | | | | | | | 60.00% | 60.00% | |
Debt instrument, covenant minimum fixed charge coverage ratio | | | | | | | | | 1.5 | 1.5 | |
Bank Line of Credit | | | | | | | | | | | |
Debt Instrument | | | | | | | | | | | |
Line of credit facility, maximum borrowing capacity | | | | | | | | | | $ 2,000,000,000 | |
Length of debt instrument extension period | | | | | | | | 1 year | | | |
Debt instrument, variable rate basis | | | | | | | | LIBOR | | | |
Debt instrument, basis spread on variable rate (as a percent) | | | | | | | | 0.925% | | | |
Debt instrument, facility fee (as a percent) | | | | | | | | 0.15% | | | |
Line of credit facility additional aggregate amount, maximum | | | | | | | | $ 500,000,000 | | | |
Bank line of credit | | | | | | | | | £ 1 | 1,000,000,000 | |
Line of credit, portion denominated in GBP | | | | | | | | | £ 269 | $ 422,000,000 | |
Weighted-average interest rate (as a percent) | | | | | | | | | 1.53% | 1.53% | |
Debt instruments, carrying amount | | | | | | | | | | $ 1,022,324,000 | |
Repayments of Lines of Credit | £ | | | £ 220 | | | | | | | | |
Debt instrument, covenant net worth | | | | | | | | | | 9,500,000,000 | |
2,018 | | | | | | | | | | 1,022,324,000 | |
Total debt before discount, net | | | | | | | | | | 1,022,324,000 | |
Term loans | | | | | | | | | | | |
Debt Instrument | | | | | | | | | | | |
Debt instruments, carrying amount | | | | | | | | | £ 357 | 561,525,000 | |
2,016 | | | | | | | | | | 215,487,000 | |
2,019 | | | | | | | | | | 346,038,000 | |
Total debt before discount, net | | | | | | | | | | 561,525,000 | |
2015 Term Loan [Member] | | | | | | | | | | | |
Debt Instrument | | | | | | | | | | | |
Length of debt instrument extension period | | | 1 year | | | | | | | | |
Debt instrument, variable rate basis | | | GBP LIBOR | | | | | | | | |
Debt instrument, basis spread on variable rate (as a percent) | | | 0.975% | | | | | | | | |
Debt instruments, carrying amount | | | £ 220 | | | | | | | $ 346,000,000 | |
Maturity period of debt instruments | | | 4 years | | | | | | | | |
Derivative, fixed interest rate (as a percent) | | | 1.79% | | | | | | | | |
Senior Unsecured Notes | | | | | | | | | | | |
Debt Instrument | | | | | | | | | | | |
Weighted-average interest rate (as a percent) | | | | | | | | | 4.71% | 4.71% | |
Debt instruments, carrying amount | | | | | | | | | | $ 8,567,293,000 | |
Senior unsecured notes | | | | | | | | | | 8,600,000,000 | |
Weighted-average maturity | | | | | | | | 6 years | | | |
2,016 | | | | | | | | | | 900,000,000 | |
2,017 | | | | | | | | | | 750,000,000 | |
2,018 | | | | | | | | | | 600,000,000 | |
2,019 | | | | | | | | | | 450,000,000 | |
Thereafter | | | | | | | | | | 5,900,000,000 | |
Total debt before discount, net | | | | | | | | | | 8,600,000,000 | |
Discounts, net | | | | | | | | | | $ (32,707,000) | |
Senior Unsecured Notes | Minimum | | | | | | | | | | | |
Debt Instrument | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | 2.79% | 2.79% | |
Senior Unsecured Notes | Maximum | | | | | | | | | | | |
Debt Instrument | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | 6.88% | 6.88% | |
Senior Unsecured, 3.40% notes due 2025 | | | | | | | | | | | |
Debt Instrument | | | | | | | | | | | |
Debt Instrument, Face Amount | | $ 600,000,000 | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | 3.40% | | | | | | | | | |
Proceeds from Issuance of Long-term Debt | | $ 591,000,000 | | | | | | | | | |
Senior Unsecured 4.0% notes due 2025 | | | | | | | | | | | |
Debt Instrument | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | | | | | | | $ 750,000,000 | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | 4.00% | 4.00% | |
Proceeds from Issuance of Long-term Debt | | | | | | | | $ 738,570,000 | | | |
Senior Unsecured, 3.875% notes due 2024 | | | | | | | | | | | |
Debt Instrument | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | $ 800,000,000 | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | 3.875% | | | | | | | |
Proceeds from Issuance of Long-term Debt | | | | $ 792,000,000 | | | | | | | |
Senior Unsecured, 4.20% notes due 2024 | | | | | | | | | | | |
Debt Instrument | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | | | $ 350,000,000 | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | 4.20% | | | | | |
Proceeds from Issuance of Long-term Debt | | | | | | $ 346,000,000 | | | | | |
Senior unsecured notes, 2.7% | | | | | | | | | | | |
Debt Instrument | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | 2.70% | | | | |
Repayments of Senior Debt | | | | | | | $ 400,000,000 | | | | |
Senior Unsecured Debt 6.0 Percent Incepted March 1, 2015 | | | | | | | | | | | |
Debt Instrument | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | 6.00% | | | | | | | | | | |
Repayments of Senior Debt | $ 200,000,000 | | | | | | | | | | |
Senior Unsecured Debt 7.07 Percent Incepted June 8, 2015 [Member] | | | | | | | | | | | |
Debt Instrument | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | 7.07% | 7.07% | |
Repayments of Senior Debt | | | | | | | | $ 200,000,000 | | | |
Senior Unsecured Debt 6.0 Percent Incepted June 14, 2014 | | | | | | | | | | | |
Debt Instrument | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | 6.00% | | | | | | |
Repayments of Senior Debt | | | | | $ 62,000,000 | | | | | | |
Senior Unsecured Debt LIBOR [Member] | | | | | | | | | | | |
Debt Instrument | | | | | | | | | | | |
Repayments of Senior Debt | | | | | $ 25,000,000 | | | | | | |
Mortgage Debt | | | | | | | | | | | |
Debt Instrument | | | | | | | | | | | |
Weighted-average interest rate (as a percent) | | | | | | | | | 6.22% | 6.22% | |
Debt instruments, carrying amount | | | | | | | | | | $ 967,072,000 | |
Number of healthcare facilities used to secure debt | item | | | | | | | | | 68 | 68 | |
Debt instrument, collateral, healthcare facilities carrying value | | | | | | | | | | $ 1,300,000,000 | |
Weighted-average maturity | | | | | | | | 3 years | | | |
2015 (Nine months) | | | | | | | | | | 22,172,000 | |
2,016 | | | | | | | | | | 292,222,000 | |
2,017 | | | | | | | | | | 581,891,000 | |
2,018 | | | | | | | | | | 6,583,000 | |
2,019 | | | | | | | | | | 2,072,000 | |
Thereafter | | | | | | | | | | 63,170,000 | |
Total debt before discount, net | | | | | | | | | | 968,110,000 | |
Discounts, net | | | | | | | | | | $ (1,038,000) | |
Mortgage Debt | Minimum | | | | | | | | | | | |
Debt Instrument | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | 3.19% | 3.19% | |
Mortgage Debt | Maximum | | | | | | | | | | | |
Debt Instrument | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | 8.35% | 8.35% | |
Demand Note | | | | | | | | | | | |
Debt Instrument | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | 4.50% | 4.50% | |
Other debt | | | | | | | | | | $ 26,000,000 | |
Non-interest Bearing Life Care Bonds | | | | | | | | | | | |
Debt Instrument | | | | | | | | | | | |
Other debt | | | | | | | | | | $ 69,000,000 | |