CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues:
Rental income	$ 526,703us-gaap_RealEstateRevenueNet	$ 459,380us-gaap_RealEstateRevenueNet	$ 450,769us-gaap_RealEstateRevenueNet
Residents fees and services	318,184snh_ResidentsFeesAndServicesRevenue	302,058snh_ResidentsFeesAndServicesRevenue	184,031snh_ResidentsFeesAndServicesRevenue
Total revenues	844,887us-gaap_Revenues	761,438us-gaap_Revenues	634,800us-gaap_Revenues
Expenses:
Property operating expenses	324,564	299,878	197,696
Depreciation	185,391	153,026	139,042
General and administrative	38,946us-gaap_GeneralAndAdministrativeExpense	32,657us-gaap_GeneralAndAdministrativeExpense	31,517us-gaap_GeneralAndAdministrativeExpense
Acquisition related costs	4,607	3,378	9,394
Impairment of assets	(10)us-gaap_AssetImpairmentCharges	7,989us-gaap_AssetImpairmentCharges	3,071us-gaap_AssetImpairmentCharges
Total expenses	553,498us-gaap_CostsAndExpenses	496,928us-gaap_CostsAndExpenses	380,720us-gaap_CostsAndExpenses
Operating income	291,389us-gaap_OperatingIncomeLoss	264,510us-gaap_OperatingIncomeLoss	254,080us-gaap_OperatingIncomeLoss
Interest and other income	425us-gaap_InterestAndOtherIncome	711us-gaap_InterestAndOtherIncome	1,117us-gaap_InterestAndOtherIncome
Interest expense	(135,114)us-gaap_InterestExpense	(117,819)us-gaap_InterestExpense	(117,240)us-gaap_InterestExpense
Loss on early extinguishment of debt	(12)	(797)	(6,349)
Gain on lease terminations			375us-gaap_GainLossOnContractTermination
Income from continuing operations before income tax expense and equity in earnings of an investee	156,688	146,605	131,983
Income tax expense	(576)us-gaap_IncomeTaxExpenseBenefit	(600)us-gaap_IncomeTaxExpenseBenefit	(375)us-gaap_IncomeTaxExpenseBenefit
Equity in earnings of an investee	87	334	316
Income from continuing operations	156,199	146,339	131,924
Discontinued operations:
Income from discontinued operations	1,362	5,043	4,061
Loss on asset impairment from discontinued operations	(4,377)	(37,610)
Income before gain on sale of properties	153,184	113,772	135,985
Gain on sale of properties	5,453us-gaap_GainLossOnSaleOfProperties	37,392us-gaap_GainLossOnSaleOfProperties	(101)us-gaap_GainLossOnSaleOfProperties
Net income	158,637	151,164	135,884
Other comprehensive income:
Change in net unrealized (loss) / gain on investments	(5,085)	3,901	8,312
Share of comprehensive income (loss) of an investee	2	(51)	22
Comprehensive income	$ 153,554us-gaap_ComprehensiveIncomeNetOfTax	$ 155,014us-gaap_ComprehensiveIncomeNetOfTax	$ 144,218us-gaap_ComprehensiveIncomeNetOfTax
Basic	198,868	187,271	169,508
Diluted	198,894	187,414	169,671
Net income per share:
Income from continuing operations per share (in dollars per share)	$ 0.81	$ 0.98	$ 0.78
Discontinued operations	$ (0.01)	$ (0.17)	$ 0.02
Net income per share (in dollars per share)	$ 0.80us-gaap_EarningsPerShareBasicAndDiluted	$ 0.81us-gaap_EarningsPerShareBasicAndDiluted	$ 0.80us-gaap_EarningsPerShareBasicAndDiluted

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The aggregate revenue from residents fees and related services provided during the reporting period.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Total costs of sales and operating expenses for the period.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Amount of expense incurred and directly related to generating revenue from leased and rented property or equipment.

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After tax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal.

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Amount after tax of loss recognized for the write-down to fair value, less cost to sell, of a disposal group. Includes after tax gain for a subsequent increase in fair value (less cost to sell) up to the cumulative loss previously recognized through write-downs.

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Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Income or Loss from continuing operations, net of taxes, including net Income or Loss from discontinued operations but before extraordinary items.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest.

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The amount of net income (loss) from continuing operations per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares.

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Per basic and diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation, when the per share amount is the same.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of interest income and other income recognized during the period. Included in this element is interest derived from investments in debt securities, cash and cash equivalents, and other investments which reflect the time value of money or transactions in which the payments are for the use or forbearance of money and other income from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business).

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Amount of the cost of borrowed funds accounted for as interest expense.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The net result for the period of deducting operating expenses from operating revenues.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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The aggregate revenue from real estate operations during the reporting period.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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