Real Estate Investments, Net - Additional Information (Detail) $ in Millions	1 Months Ended					3 Months Ended	6 Months Ended
	Jul. 31, 2017 USD ($) facility	Jun. 30, 2017 USD ($) facility unit	May 31, 2017 USD ($) unit renewal_option facility bed	Mar. 31, 2017 USD ($) renewal_option facility bed	Feb. 28, 2017 USD ($) renewal_option facility bed	Jun. 30, 2017 USD ($) facility unit	Jun. 30, 2017 USD ($) facility intangible_asset unit lease	Jul. 01, 2017 facility
Investment [Line Items]
Number of living facilities | unit		164				164	164
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	$ 0.9
Subsequent Event [Member]
Investment [Line Items]
Number of facilities acquired | facility	3
Acquisition consideration	$ 15.5
Anticipated initial annual lease revenues	$ 1.4
Off-Market Favorable Lease [Member]
Investment [Line Items]
Number of identified intangible assets | intangible_asset							2
Premier Senior Living LLC [Member]
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 [Member]
Investment [Line Items]
Number of facilities acquired | facility				5
Number of beds acquired | bed				455
Acquisition consideration				$ 29.2
Leases period				15 years
Leases renewal options | renewal_option				2
Leases renewal term				5 years
Anticipated initial annual lease revenues				$ 2.9
Better Senior Living Consulting LLC [Member]
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 [Member]
Investment [Line Items]
Number of units available in living facilities | unit			119
Acquisition consideration			$ 6.5
Total number of facilities acquired, final and pending closing | facility			3
Number of facilities acquired pending closing after reporting date | facility		2				2	2
Leases period			14 years
Leases renewal options | renewal_option			2
Leases renewal term			5 years
Anticipated initial annual lease revenues			$ 0.6
Cascadia Healthcare LLC [Member] | Subsequent Event [Member]
Investment [Line Items]
Number of facilities acquired | facility								1
OnPointe Health LLC [Member]
Investment [Line Items]
Acquisition consideration		$ 27.3
Anticipated initial annual lease revenues		2.5
Tenant purchase option		$ 14.3
OnPointe Health LLC [Member] | Maximum [Member]
Investment [Line Items]
Leases period		19 years
OnPointe Health LLC [Member] | Minimum [Member]
Investment [Line Items]
Leases period		17 years
OnPointe Health LLC [Member] | Brownsville TX [Member]
Investment [Line Items]
Number of units available in living facilities | unit		126				126	126
OnPointe Health LLC [Member] | Albuquerque NM [Member]
Investment [Line Items]
Number of units available in living facilities | unit		136				136	136
Ensign Master Leases [Member]
Investment [Line Items]
Escalation factor for calculating revenues after year two		0.00%				0.00%	0.00%
Percentage change in the consumer price index		2.50%				2.50%	2.50%
Ensign Master Leases [Member]
Investment [Line Items]
Facilities subject to operating lease | facility		92				92	92
Number of master leases | unit		8				8	8
Annualized revenues from master leases		$ 57.7				$ 57.7	$ 57.7
Various Other Operators [Member]
Investment [Line Items]
Facilities subject to operating lease | facility		69				69	69