Real Estate Investments, Net - Narrative (Details) $ in Millions	1 Months Ended						3 Months Ended	9 Months Ended
	Sep. 30, 2017 USD ($) facility unit renewal_option lease bed	Jul. 31, 2017 USD ($) unit renewal_option bed	Jun. 30, 2017 USD ($) unit	May 31, 2017 USD ($) unit renewal_option facility bed	Mar. 31, 2017 USD ($) renewal_option facility bed	Feb. 28, 2017 USD ($) renewal_option facility bed	Sep. 30, 2017 USD ($) facility unit lease bed	Sep. 30, 2017 USD ($) facility intangible_asset unit lease bed
Investment [Line Items]
Number of living facilities | facility	174						174	174
Number of facilities not leased | facility	3						3	3
Number of operating leases acquired | lease								5
Remaining lease term								81 years
Impairment of real estate investment								$ 0.9
Off-Market Favorable Lease
Investment [Line Items]
Number of identified intangible assets | intangible_asset								2
Premier Senior Living LLC
Investment [Line Items]
Number of facilities acquired | facility						2
Number of beds acquired | bed						96
Acquisition consideration						$ 26.1
Leases period						14 years
Leases renewal options | renewal_option						2
Leases renewal term						5 years
Anticipated initial annual lease revenues						$ 2.2
WLC Management Firm LLC
Investment [Line Items]
Number of facilities acquired | facility					5
Number of beds acquired | bed		99			455
Acquisition consideration		$ 3.7			$ 29.2
Leases period		14 years			15 years
Leases renewal options | renewal_option		2			2
Leases renewal term		5 years			5 years
Anticipated initial annual lease revenues		$ 0.4			$ 2.9
Better Senior Living Consulting LLC
Investment [Line Items]
Number of beds acquired | bed				170
Acquisition consideration				$ 2.0
Leases period				13 years
Leases renewal options | renewal_option				2
Leases renewal term				5 years
Anticipated initial annual lease revenues				$ 0.3
Cascadia Healthcare LLC
Investment [Line Items]
Number of facilities acquired | facility	3			3			3	3
Total number of facilities acquired, completed and pending at reporting date | facility	7						7	7
Leases period	13 years 6 months			14 years
Leases renewal options | renewal_option	2			2
Leases renewal term	5 years			5 years
Anticipated initial annual lease revenues	$ 2.7			$ 1.1
Cascadia Healthcare LLC | Nampa ID
Investment [Line Items]
Number of units available in living facilities | unit				119
Acquisition consideration				$ 6.5
Cascadia Healthcare LLC | Oregon and Washington
Investment [Line Items]
Number of facilities acquired | facility	2						2	2
Number of units available in living facilities | unit	129						129	129
Acquisition consideration							$ 4.9
Cascadia Healthcare LLC | Idaho
Investment [Line Items]
Number of beds acquired | bed	236						236	236
Acquisition consideration	$ 29.8
OnPointe Health LLC
Investment [Line Items]
Acquisition consideration			$ 27.3
Anticipated initial annual lease revenues			2.5
Tenant purchase option			$ 14.3
OnPointe Health LLC | Maximum
Investment [Line Items]
Leases period			19 years
OnPointe Health LLC | Minimum
Investment [Line Items]
Leases period			17 years
OnPointe Health LLC | Brownsville TX
Investment [Line Items]
Number of units available in living facilities | unit			126
OnPointe Health LLC | Albuquerque NM
Investment [Line Items]
Number of units available in living facilities | unit			136
Prelude Home & Services LLC
Investment [Line Items]
Number of units available in living facilities | unit		30
Acquisition consideration		$ 7.8
Leases period		12 years 6 months
Leases renewal options | renewal_option		2
Leases renewal term		5 years
Anticipated initial annual lease revenues		$ 0.6
Priority Management Group LLC
Investment [Line Items]
Number of facilities acquired | facility	3						3	3
Number of beds acquired | bed	405						405	405
Acquisition consideration	$ 20.3
Leases period	14 years
Leases renewal options | renewal_option	2
Leases renewal term	5 years
Anticipated initial annual lease revenues	$ 1.9
Ensign Master Leases
Investment [Line Items]
Percentage change in the consumer price index	2.50%						2.50%	2.50%
Ensign Master Leases
Investment [Line Items]
Facilities subject to operating lease | facility	92						92	92
Annualized revenues from master leases	$ 57.7						$ 57.7	$ 57.7
Ensign | Ensign Master Leases
Investment [Line Items]
Number of master leases | lease	8						8	8
Escalation factor for calculating revenues after year two	0.00%						0.00%	0.00%
Various Other Operators
Investment [Line Items]
Facilities subject to operating lease | facility	79						79	79