CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Revenues:
Rental income	$ 145,784us-gaap_RealEstateRevenueNet	$ 112,055us-gaap_RealEstateRevenueNet
Residents fees and services	82,793snh_ResidentsFeesAndServicesRevenue	79,442snh_ResidentsFeesAndServicesRevenue
Total revenues	228,577us-gaap_Revenues	191,497us-gaap_Revenues
Expenses:
Property operating expenses	85,794	77,802
Depreciation	53,707	38,355
General and administrative	10,574us-gaap_GeneralAndAdministrativeExpense	8,290us-gaap_GeneralAndAdministrativeExpense
Acquisition related costs	1,158	122
Total expenses	151,233us-gaap_CostsAndExpenses	124,569us-gaap_CostsAndExpenses
Operating income	77,344us-gaap_OperatingIncomeLoss	66,928us-gaap_OperatingIncomeLoss
Interest and other income	75us-gaap_InterestAndOtherIncome	105us-gaap_InterestAndOtherIncome
Interest expense	(35,942)us-gaap_InterestExpense	(28,900)us-gaap_InterestExpense
Loss on extinguishment of debt	(1,409)
Gain on lease terminations	105us-gaap_GainLossOnContractTermination
Income from continuing operations before income tax expense and equity in earnings of an investee	40,068	38,133
Income tax expense	(110)us-gaap_IncomeTaxExpenseBenefit	(191)us-gaap_IncomeTaxExpenseBenefit
Equity in earnings of an investee	72	(97)
Income from continuing operations	40,030	37,845
Discontinued operations:
Income from discontinued operations	(241)	1,300
Loss on asset impairment from discontinued operations		(721)
Income before gain on sale of properties	39,789	38,424
Gain on sale of properties		156us-gaap_GainLossOnSaleOfProperties
Net income	39,789	38,580
Other comprehensive income:
Change in net unrealized gain(loss) on investments	1,448	(1,921)
Share of comprehensive income of an investee	45	19
Comprehensive income	$ 41,282us-gaap_ComprehensiveIncomeNetOfTax	$ 36,678us-gaap_ComprehensiveIncomeNetOfTax
Weighted average common shares outstanding (basic) (in shares)	221,375	188,026
Weighted average common shares outstanding (diluted) (in shares)	221,397	188,045
Net income per share:
Income from continuing operations per share (in dollars per share)	$ 0.18	$ 0.21
Net income per share (in dollars per share)	$ 0.18us-gaap_EarningsPerShareBasicAndDiluted	$ 0.21us-gaap_EarningsPerShareBasicAndDiluted

Represents the increase (decrease) in the entity's share of other comprehensive income of the investee.

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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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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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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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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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No definition available.

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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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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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