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Real Estate Properties (Details 2) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 2 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended | 1 Months Ended |  |  | 12 Months Ended | 2 Months Ended | 12 Months Ended | 1 Months Ended | 2 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 2 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 2 Months Ended |  | 12 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended |  | 3 Months Ended | 1 Months Ended
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Nov. 30, 2009 Property | Jun. 30, 2011 Property | Dec. 31, 2011 Property sqft state | Dec. 31, 2010 Property | Dec. 31, 2009 Property | Dec. 31, 2011 Above market lease Y | Dec. 31, 2010 Above market lease | Dec. 31, 2011 In-place lease intangibles Y | Dec. 31, 2010 In-place lease intangibles | Dec. 31, 2011 Below market lease Y | Dec. 31, 2010 Below market lease | Dec. 31, 2011 Five Star Property | Dec. 31, 2010 Five Star | Feb. 29, 2012 Senior living communities Five Star Property unit | Dec. 31, 2011 Senior living communities Five Star Property unit | Dec. 31, 2011 Acquisition | Dec. 31, 2010 Acquisition | Dec. 31, 2011 Acquisition Senior living communities Property | Jun. 30, 2011 Acquisition MOB Property | Dec. 31, 2011 Acquisition MOB Property | Dec. 31, 2010 Acquisition MOB Property | Sep. 30, 2011 Acquisition MOB CommonWealth REIT (CWH) Property sqft | Jan. 31, 2011 Acquisition MOB CommonWealth REIT (CWH) Property sqft | Dec. 31, 2010 Acquisition MOB CommonWealth REIT (CWH) sqft Property | Aug. 31, 2011 Acquisition Five States, Southeast Senior living communities Property | Jul. 31, 2011 Acquisition Five States, Southeast Senior living communities Property | Jun. 30, 2011 Acquisition Five States, Southeast Senior living communities Property | Dec. 31, 2011 Acquisition Five States, Southeast Senior living communities Five Star Property | Apr. 30, 2010 Acquisition Colorado MOB Property sqft | Oct. 31, 2010 Acquisition Texas MOB sqft Property | Jun. 30, 2010 Acquisition Texas MOB sqft Property | May 31, 2011 Acquisition Illinois Senior living communities Property unit | May 31, 2011 Acquisition Illinois Senior living communities Five Star Lease No. 1 Five Star | Sep. 30, 2010 Acquisition Illinois MOB Property sqft | Sep. 30, 2010 Acquisition Georgia MOB sqft Property | May 31, 2011 Acquisition Minnesota MOB sqft Property | Jan. 31, 2011 Acquisition Minnesota MOB sqft Property | Jul. 31, 2011 Acquisition Florida MOB Property sqft | Jun. 30, 2011 Acquisition Florida MOB sqft Property | Jul. 31, 2011 Acquisition Florida MOB Property | Jun. 30, 2011 Acquisition Florida MOB Property | Aug. 31, 2011 Acquisition Florida Land acre | Nov. 30, 2011 Acquisition Virginia MOB Property sqft | Dec. 31, 2011 Acquisition Six states Senior living communities Property | Dec. 31, 2011 Acquisition Indiana MOB Property sqft | Dec. 31, 2011 Sale | May 31, 2011 Sale Five Star | Jun. 30, 2011 Sale Five Star | Dec. 31, 2011 Sale Senior living communities Property | Dec. 31, 2011 Sale MOB Property | Dec. 31, 2011 Sale Skilled nursing facilities Property | Dec. 31, 2010 Sale Skilled nursing facilities Property | Dec. 31, 2011 Sale Assisted living community Property | Aug. 31, 2010 Sale Nebraska Skilled nursing facilities Property unit | Feb. 29, 2012 Agreement to acquire agreement sqft | Sep. 30, 2011 Agreement to acquire MOB CommonWealth REIT (CWH) sqft Property | Nov. 30, 2010 Agreement to acquire MOB CommonWealth REIT (CWH) Property sqft state | Mar. 31, 2011 Agreement to acquire Five States, Southeast Senior living communities Property state | May 31, 2011 Agreement to acquire Five States, Southeast Senior living communities Five Star Property | Dec. 31, 2011 Agreement to acquire Five States, Southeast Senior living communities Five Star Property | Jul. 31, 2011 Agreement to acquire Six states Senior living communities Property unit state | Sep. 30, 2011 Agreement to acquire Eight states MOB CommonWealth REIT (CWH) state | Feb. 29, 2012 Agreement to acquire Missouri Senior living communities Property unit | Feb. 29, 2012 Agreement to acquire Georgia and Hawaii MOB Property | Nov. 30, 2010 Agreement to sell Georgia Senior living communities unit | Nov. 30, 2010 Agreement to sell Georgia Skilled nursing facilities Property
Real estate properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of states in which properties are located |  |  | 38 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 | 5 |  |  | 6 | 8 |  |  |  |
Aggregate purchase price of properties acquired, excluding closing costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,300 | $ 11,300 |  |  |  |  | $ 991,618 | $ 433,955 | $ 167,000 | $ 95,870 | $ 374,130 | $ 17,158 | $ 44,671 | $ 196,594 |  | $ 4,450 | $ 15,000 | $ 12,175 | $ 7,500 |  | $ 18,400 | $ 9,800 | $ 7,200 | $ 14,150 | $ 5,200 | $ 14,550 |  |  | $ 4,000 | $ 11,425 | $ 379,000 | $ 21,000 |  |  |  |  |  |  |  |  |  | $ 144,750 | $ 167,000 | $ 470,000 | $ 304,000 |  |  | $ 478,000 |  |  |  |  |
Number of properties acquired or agreed to be acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 1 |  |  | 28 | 4 | 28 | 26 | 13 | 6 | 21 | 1 | 3 | 14 | 18 | 1 | 1 | 1 | 1 |  | 1 | 1 | 1 | 1 | 1 | 3 | 4 | 3 |  | 2 | 8 | 1 |  |  |  |  |  |  |  |  |  |  | 13 | 27 | 20 |  |  | 9 |  | 1 | 4 |  |
Mortgage loans assumed in real estate acquisition |  |  | 217,317 | 2,458 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,459 | 12,757 | 48,062 |  | 2,458 |  |  |  |  |  |  |  |  | 3,653 |  |  |  |  | 9,633 | 130,752 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans assumed in real estate acquisition, interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.73% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acquisition agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |
Number of properties agreed to be acquired, or agreed to be acquired, referred as leased properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 | 2 |  |  |  |  |  |
Number of properties acquired, referred as managed properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties leased |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 188 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units |  |  |  |  |  |  |  |  |  |  |  |  |  | 92 | 57 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 73 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 196 |  |  |  |  |  |  | 2,226 |  | 87 |  | 329 |
Initial lease rent |  |  |  |  |  |  |  |  |  |  |  | 195,228 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 608 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate properties acquired (in square feet) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,300,000 | 737,000 | 2,100,000 |  |  |  |  | 14,695 | 58,605 | 55,800 |  |  | 64,860 | 38,030 | 49,809 | 84,474 | 32,476 | 125,990 |  |  |  | 45,645 |  | 94,238 |  |  |  |  |  |  |  |  |  | 514,409 | 1,300,000 | 2,800,000 |  |  |  |  |  |  |  |  |
Intangible lease assets recorded |  |  | 130,153 | 78,117 |  | 39,075 | 24,499 | 91,078 | 53,618 |  |  |  |  |  |  | 52,210 | 27,837 |  |  |  |  |  | 9,217 | 18,840 |  |  |  |  | 775 | 1,867 | 1,783 |  |  | 3,144 | 1,428 | 1,403 | 2,722 |  | 953 |  | 953 |  | 1,898 |  | 4,867 |  |  |  |  |  |  |  |  |  |  | 31,150 |  |  |  |  |  |  |  |  |  |
Intangible lease liabilities recorded |  |  | 25,487 | 21,735 |  |  |  |  |  |  |  |  |  |  |  | 3,770 | 10,206 |  |  |  |  |  | 1,600 | 7,806 |  |  |  |  | 168 | 1,561 | 506 |  |  |  | 164 | 51 |  |  | 200 |  | 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,919 |  |  |  |  |  |  |  |  |  |
Amortization expenses included in depreciation and amortization |  |  | 11,318 | 4,468 | 3,669 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reductions in rental income on capitalized above market and below market lease due to amortization |  |  | 93 | (891) | (1,006) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated amortization on lease assets |  |  |  |  |  | 9,612 | 5,494 | 20,306 | 9,030 | 7,709 | 3,496 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization period (in years) |  |  |  |  |  | 6.9 |  | 6.9 |  | 8.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future amortization of intangible lease assets and liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 |  |  | 16,710 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 |  |  | 15,243 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 |  |  | 11,885 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 |  |  | 10,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 |  |  | 8,979 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter |  |  | 19,240 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold or agreed to be sold | 1 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 4 | 4 | 1 | 4 |  |  |  |  |  |  |  |  |  |  |  | 3
Aggregate sale price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,460 |  |  |  |  |  | 1,450 |  | 1,450 |  |  |  |  |  |  |  |  |  |  | 18,000 |
Gain on sale of properties |  |  | 21,315 | 109 | 397 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,315 |  |  |  |  |  |  |  | 109 |  |  |  |  |  |  |  |  |  |  |  |
Impairment of asset charges recorded |  |  | 1,990 | 5,965 | 15,530 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties impaired |  |  | 4 | 7 | 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate improvements purchased |  |  |  |  |  |  |  |  |  |  |  | 33,269 | 31,894 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase or decrease in annual lease rent payable |  |  |  |  |  |  |  |  |  |  |  | 2,665 | 2,555 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,923 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (72) | (1,792) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties classified as held for sale | 1 |  | 2 |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate properties, held for sale |  |  |  |  |  |  |  |  |  |  |  | 1,715 | 3,603 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of land (in acres) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leases Committed Expenditure |  |  | 6,133 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Square Footage of Real Estate Property Leased |  |  | 575,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Committed but Unspent Tenat Related Obligations |  |  | $ 6,912 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Represents the area of the real estate property. + References No definition available. + Details
Name: | snh_AcreageOfRealEstateProperty
Namespace Prefix: | snh_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | snh_FiniteLivedIntangibleLeaseAssetsAndLiabilitiesFutureAmortizationExpenseAbstract
Namespace Prefix: | snh_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the increase or decrease in rental income associated with capitalized above market and below market lease due to amortization. + References No definition available. + Details
Name: | snh_IncreaseDecreaseInCapitalizedAboveAndBelowMarketLeasesRentalIncome
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the increase or decrease on the annual rent the lessee is obligated to pay on an operating lease. + References No definition available. + Details
Name: | snh_IncreaseDecreaseOperatingLeasesAnnualRent
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of committed but unspent tenant related obligations based on executed lease. + References No definition available. + Details
Name: | snh_LeaseCommittedButUnspentTenatRelatedObligations
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of expenditure committed by entity relating to leases. + References No definition available. + Details
Name: | snh_LeasesCommittedExpenditure
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the interest rate on debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. + References No definition available. + Details
Name: | snh_NoncashOrPartNoncashAcquisitionDebtAssumedInterestRate
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of agreements entered into by the entity to acquire real estate properties. + References No definition available. + Details
Name: | snh_NumberOfAgreementsEntered
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the number of properties acquired or agreed to be acquired by the entity during the period. + References No definition available. + Details
Name: | snh_NumberOfPropertiesAcquired
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of properties acquired or agreed to be acquired by the entity under purchase agreements, which are referred by the entity as leased properties. + References No definition available. + Details
Name: | snh_NumberOfPropertiesAcquiredLeasedProperties
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | snh_NumberOfPropertiesAcquiredManagedProperties
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the number of properties sold or agreed to be sold by the entity. + References No definition available. + Details
Name: | snh_NumberOfPropertiesSold
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of real estate properties owned by the entity, which are classified as held for sale as of the balance sheet date. + References No definition available. + Details
Name: | snh_NumberOfRealEstatePropertiesHeldForSale
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of real estate properties impaired. + References No definition available. + Details
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Namespace Prefix: | snh_
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Balance Type: | na
Period Type: | duration

X
- Definition Represents the annual rent the lessee is obligated to pay on an operating lease. + References No definition available. + Details
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Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents the aggregate purchase price excluding closing costs, of real estate properties acquired by the entity during the period. + References No definition available. + Details
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Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents the aggregate sales price excluding closing costs, of real estate properties sold by the entity during the period. + References No definition available. + Details
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Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of improvements to real estate properties made by lessees and purchased by the entity. + References No definition available. + Details
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Namespace Prefix: | snh_
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Balance Type: | debit
Period Type: | duration

X
- Definition Represents the intangible lease assets recorded as part of the real estate acquisition. + References No definition available. + Details
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Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the intangible lease liabilities recorded as part of the real estate acquisition. + References No definition available. + Details
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Namespace Prefix: | snh_
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Balance Type: | credit
Period Type: | instant

X
- Definition Represents the area of the real estate property subject to an operating lease. + References No definition available. + Details
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Namespace Prefix: | snh_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | duration

X
- Definition The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6390789&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 45, 46, 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition The accumulated amount of amortization of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 + Details
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- Definition Aggregate amount of intangible asset amortization recognized as expense during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 + Details
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- Definition The average useful life of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16265-109275 + Details
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Balance Type: | na
Period Type: | duration

X
- Definition The amount of amortization expense expected to be recognized for the remainder of the finite-lived intangible asset useful life after the fifth succeeding fiscal year. + References No definition available. + Details
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Period Type: | duration

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- Definition The amount of amortization expense expected to be recognized during year five of the five succeeding fiscal years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 + Details
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- Definition The amount of amortization expense expected to be recognized during year four of the five succeeding fiscal years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 + Details
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- Definition The amount of amortization expense expected to be recognized during year one of the five succeeding fiscal years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 + Details
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- Definition The amount of amortization expense expected to be recognized during year three of the five succeeding fiscal years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The amount of amortization expense expected to be recognized during year two of the five succeeding fiscal years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 + Details
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X
- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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Balance Type: | credit
Period Type: | duration

X
- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of units (items of property) under operating lease arrangements. + References No definition available. + Details
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Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity. + 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(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of square footage related to a real estate property. + References No definition available. + Details
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Period Type: | duration