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Selected Quarterly Financial Data (unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended 5 Months Ended 10 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
property
Oct. 31, 2014
property
Selected Quarterly Financial Data (unaudited)                          
Revenues $ 229,809us-gaap_Revenues $ 216,873us-gaap_Revenues $ 206,708us-gaap_Revenues $ 191,497us-gaap_Revenues $ 200,336us-gaap_Revenues $ 187,265us-gaap_Revenues $ 186,928us-gaap_Revenues $ 186,909us-gaap_Revenues $ 844,887us-gaap_Revenues $ 761,438us-gaap_Revenues $ 634,800us-gaap_Revenues    
Net income 45,288us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 37,112us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 37,659us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 38,580us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 72,206us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 38,125us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 5,598us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 35,235us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 158,637us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 151,164us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 135,884us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic    
Per share data:                          
Net income (in dollars per share) $ 0.22us-gaap_EarningsPerShareBasic $ 0.18us-gaap_EarningsPerShareBasic $ 0.19us-gaap_EarningsPerShareBasic $ 0.21us-gaap_EarningsPerShareBasic $ 0.38us-gaap_EarningsPerShareBasic $ 0.20us-gaap_EarningsPerShareBasic $ 0.03us-gaap_EarningsPerShareBasic $ 0.19us-gaap_EarningsPerShareBasic          
Common distributions declared (in dollars per share) $ 0.39us-gaap_CommonStockDividendsPerShareDeclared $ 0.39us-gaap_CommonStockDividendsPerShareDeclared $ 0.39us-gaap_CommonStockDividendsPerShareDeclared $ 0.39us-gaap_CommonStockDividendsPerShareDeclared $ 0.39us-gaap_CommonStockDividendsPerShareDeclared $ 0.39us-gaap_CommonStockDividendsPerShareDeclared $ 0.39us-gaap_CommonStockDividendsPerShareDeclared $ 0.39us-gaap_CommonStockDividendsPerShareDeclared          
Impairment charge             32,267us-gaap_AssetImpairmentCharges   (10)us-gaap_AssetImpairmentCharges 7,989us-gaap_AssetImpairmentCharges 3,071us-gaap_AssetImpairmentCharges    
Selected quarterly financial data (unaudited)                          
Gain (Loss) on Sale of Properties                 5,453us-gaap_GainLossOnSaleOfProperties 37,392us-gaap_GainLossOnSaleOfProperties (101)us-gaap_GainLossOnSaleOfProperties    
Sale                          
Selected quarterly financial data (unaudited)                          
Number of Properties Sold                       3snh_NumberOfPropertiesSold
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= snh_SaleOfAssetsMember
6snh_NumberOfPropertiesSold
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= snh_SaleOfAssetsMember
Gain (Loss) on Sale of Properties                       37,392us-gaap_GainLossOnSaleOfProperties
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= snh_SaleOfAssetsMember
5,452us-gaap_GainLossOnSaleOfProperties
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= snh_SaleOfAssetsMember
Rehabilitation hospitals | Sale                          
Selected quarterly financial data (unaudited)                          
Number of Properties Sold                   2snh_NumberOfPropertiesSold
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= snh_RehabilitationHospitalsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= snh_SaleOfAssetsMember
  2snh_NumberOfPropertiesSold
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= snh_RehabilitationHospitalsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= snh_SaleOfAssetsMember
 
Gain (Loss) on Sale of Properties                   $ 36,251us-gaap_GainLossOnSaleOfProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= snh_RehabilitationHospitalsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= snh_SaleOfAssetsMember