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Concentration of Credit Risk (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Concentration of Credit Risk. |  |  |
Investment | $ 6,238,611 us-gaap_RealEstateInvestmentPropertyAtCost | $ 5,263,625 us-gaap_RealEstateInvestmentPropertyAtCost |
Revenue | 526,703 us-gaap_RealEstateRevenueNet | 459,380 us-gaap_RealEstateRevenueNet | 450,769 us-gaap_RealEstateRevenueNet
Five Star | Senior living communities |  |  |
Concentration of Credit Risk. |  |  |
Number of properties acquired, referred to as managed properties | 46 snh_NumberOfPropertiesAcquiredManagedProperties / us-gaap_MajorCustomersAxis = snh_FiveStarQualityCareIncMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember |  |
Investment | Rents from significant lessee |  |  |
Concentration of Credit Risk. |  |  |
Investment | 6,238,611 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateInvestmentPropertyAtCostMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 5,263,625 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateInvestmentPropertyAtCostMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember |
% of Total (as a percent) | 100.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateInvestmentPropertyAtCostMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 100.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateInvestmentPropertyAtCostMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember |
Investment | Rents from significant lessee | Five Star |  |  |
Concentration of Credit Risk. |  |  |
Investment | 2,125,517 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateInvestmentPropertyAtCostMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = snh_FiveStarQualityCareIncMember | 2,099,713 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateInvestmentPropertyAtCostMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = snh_FiveStarQualityCareIncMember |
% of Total (as a percent) | 34.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateInvestmentPropertyAtCostMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = snh_FiveStarQualityCareIncMember | 40.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateInvestmentPropertyAtCostMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = snh_FiveStarQualityCareIncMember |
Investment | Rents from significant lessee | All others |  |  |
Concentration of Credit Risk. |  |  |
Investment | 4,113,094 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateInvestmentPropertyAtCostMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = snh_OtherCustomersMember | 3,163,912 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateInvestmentPropertyAtCostMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = snh_OtherCustomersMember |
% of Total (as a percent) | 66.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateInvestmentPropertyAtCostMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = snh_OtherCustomersMember | 60.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateInvestmentPropertyAtCostMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = snh_OtherCustomersMember |
Rental income | Rents from significant lessee |  |  |
Concentration of Credit Risk. |  |  |
Revenue | 526,703 us-gaap_RealEstateRevenueNet / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 459,380 us-gaap_RealEstateRevenueNet / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember |
% of Total (as a percent) | 100.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 100.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember |
Rental income | Rents from significant lessee | Five Star |  |  |
Concentration of Credit Risk. |  |  |
Revenue | 196,269 us-gaap_RealEstateRevenueNet / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = snh_FiveStarQualityCareIncMember | 203,719 us-gaap_RealEstateRevenueNet / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = snh_FiveStarQualityCareIncMember |
% of Total (as a percent) | 37.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = snh_FiveStarQualityCareIncMember | 44.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = snh_FiveStarQualityCareIncMember |
Rental income | Rents from significant lessee | All others |  |  |
Concentration of Credit Risk. |  |  |
Revenue | $ 330,434 us-gaap_RealEstateRevenueNet / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = snh_OtherCustomersMember | $ 255,661 us-gaap_RealEstateRevenueNet / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = snh_OtherCustomersMember |
% of Total (as a percent) | 63.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = snh_OtherCustomersMember | 56.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = snh_RealEstateRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = snh_OtherCustomersMember |

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- Definition Represents the number of properties acquired or agreed to be acquired by the entity during the period, which are referred by the entity as managed properties. + References No definition available. + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The aggregate revenue from real estate operations during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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