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Real Estate Properties - Narrative (Details) ft² in Thousands	1 Months Ended														3 Months Ended		9 Months Ended
	Jun. 30, 2018 USD ($) living_unit nursing_facility community property	May 31, 2018 USD ($) community	Mar. 31, 2018 USD ($) ft² building community property	Feb. 28, 2018 living_unit	Feb. 28, 2018 USD ($)	Feb. 28, 2018 community	Feb. 28, 2018 property	Jan. 31, 2018 ft² living_unit	Jan. 31, 2018 ft² building	Jan. 31, 2018 USD ($) ft²	Jan. 31, 2018 ft² community	Jan. 31, 2018 ft² property	Dec. 31, 2017 USD ($) living_unit property	Nov. 30, 2017 property	Sep. 30, 2018 USD ($) ft² state building community property	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) ft² state living_unit building community property	Sep. 30, 2017 USD ($)
Real Estate Properties
Number of properties owned | property															443		443
Number of buildings owned | building															469		469
Number of states in which properties are located | state															42		42
Assumed debt																	$ 44,386,000	$ 0
Impairment of assets															$ 4,525,000	$ 0	5,073,000	5,082,000
Gain on sale of properties															$ 0	$ 0	261,916,000	0
Proceeds from sale of properties																	$ 332,389,000	0
Discontinued Operations, Disposed of by Sale
Real Estate Properties
Gain on sale of properties	$ 2,150,000
Impairment of real estate																		$ 0
Acquisition | MOBs
Real Estate Properties
Number of properties | property																	4
Number of buildings | building																	4
Cash paid plus assumed debt																	$ 114,973,000
Area of real estate properties (in square feet) | ft²															535		535
Assumed debt																	$ 11,050,000
Acquisition | MOBs | Kansas, Missouri And California
Real Estate Properties
Number of properties | property												3
Number of buildings | building									3
Cash paid plus assumed debt										$ 91,698,000
Area of real estate properties (in square feet) | ft²								400	400	400	400	400
Assumed debt										$ 0
Acquisition and certain other transaction related costs										544,000
Acquisition | MOBs | Virginia
Real Estate Properties
Number of properties | property			1
Number of buildings | building			1
Cash paid plus assumed debt			$ 23,275,000
Area of real estate properties (in square feet) | ft²			135
Assumed debt			$ 11,050,000
Acquisition and certain other transaction related costs			525,000
Acquisition | Five Star | Senior Living Communities
Real Estate Properties
Number of properties	2													6			4
Cash paid plus assumed debt																	$ 66,350,000
Assumed debt	$ 16,588,000																$ 33,336,000
Number of acquired private pay independent living units | living_unit																	366
Purchase price excluding closing costs	23,860,000
Acquisition and certain other transaction related costs	$ 560,000
Acquisition | Five Star | Senior Living Communities | Alabama and Indiana
Real Estate Properties
Number of properties | property													2
Number of acquired private pay independent living units | living_unit													229
Purchase price excluding closing costs													$ 39,457,000
Acquisition and certain other transaction related costs													$ 307,000
Acquisition | Five Star | Senior Living Communities | Tennessee
Real Estate Properties
Number of properties	2										1	1
Cash paid plus assumed debt	$ 23,860,000									19,868,000
Assumed debt	$ 16,588,000									0
Number of acquired private pay independent living units | living_unit	151							88
Purchase price excluding closing costs										19,868,000
Acquisition and certain other transaction related costs										$ 201,000
Acquisition | Five Star | Senior Living Communities | Arizona
Real Estate Properties
Number of properties						1	1
Cash paid plus assumed debt					$ 22,622,000
Assumed debt					16,748,000
Number of acquired private pay independent living units | living_unit				127
Purchase price excluding closing costs					22,622,000
Acquisition and certain other transaction related costs					$ 372,000
Sunrise Senior Living LLC | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Senior Living Communities
Real Estate Properties
Gain on sale of properties		$ 78,856,000	$ 181,154,000
Number of communities sold | community		1	2
Proceeds from sale of properties		$ 96,000,000	$ 217,000,000														$ 94,348,000
Rental income recognized															$ 0		$ 3,505,000
Number of real estate properties held-for-sale | community															3		3
Sunrise Senior Living LLC | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Skilled Nursing Facility
Real Estate Properties
Gain on sale of properties	$ 1,906,000
Proceeds from sale of properties	21,865,000
Rental income recognized	$ 650,000														$ 0		$ 664,000
Number of real estate properties held-for-sale | nursing_facility	1

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Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

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