Real Estate Investments, Net - Additional Information (Detail) $ in Thousands	1 Months Ended							12 Months Ended
	Dec. 31, 2016 USD ($) facility renewal_option unit campus	Aug. 31, 2016 USD ($) property renewal_option unit facility lease	Jun. 30, 2016 USD ($) facility bed	May 31, 2016 USD ($) renewal_option unit bed	Apr. 30, 2016 USD ($) bed	Mar. 31, 2016 USD ($) renewal_option unit facility bed	Feb. 29, 2016 USD ($) renewal_option unit facility bed	Dec. 31, 2016 USD ($) facility intangible_asset unit lease campus	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2016 USD ($)
Investment [Line Items]
Rental income								$ 93,126	$ 65,979	$ 51,367
Number of facilities not leased | facility	3							3
Number acquired operating leases | lease								3
Remaining term of ground lease								81 years
Series of Individually Immaterial Business Acquisitions [Member]
Investment [Line Items]
Properties subject to operating lease | property		3
Number acquired operating leases | lease		3
Leases renewal options | renewal_option		2
Leases renewal term		5 years
Anticipated annual lease revenues		$ 3,100
Number of facilities acquired | facility		1
Number of campuses acquired | campus	1							1
Number of assisted living facilities acquired | facility		1
Payments to acquire businesses		$ 34,300
Transaction costs expensed											$ 200
CPI-based rent escalator percentage floor		3.00%
New Haven of San Angelo [Member]
Investment [Line Items]
Number of units available in living facilities | unit							30
Acquisition consideration							$ 4,900
Leases period							12 years 6 months
Leases renewal options | renewal_option							2
Leases renewal term							5 years
Anticipated annual lease revenues							$ 400
Trillium Healthcare Group, LLC [Member]
Investment [Line Items]
Acquisition consideration						$ 5,000	$ 32,700
Leases period							15 years
Leases renewal options | renewal_option							2
Leases renewal term							5 years
Anticipated annual lease revenues						$ 500	$ 3,200
Number of facilities acquired | facility							9
Number of skilled nursing portfolio beds | bed						82	518
Priority Life Care, LLC [Member]
Investment [Line Items]
Number of units available in living facilities | unit						336
Acquisition consideration						$ 21,200
Leases period						15 years
Leases renewal options | renewal_option						2
Leases renewal term						5 years
Anticipated annual lease revenues						$ 1,800
Number of facilities acquired | facility						3
Better Senior Living Consulting, LLC [Member]
Investment [Line Items]
Number of units available in living facilities | unit						74
Acquisition consideration						$ 5,700
Leases period						14 years
Leases renewal options | renewal_option						2
Leases renewal term						5 years
Anticipated annual lease revenues						$ 500
Victory Park Nursing Home [Member]
Investment [Line Items]
Number of skilled nursing portfolio beds | bed					55
Victoria Retirement Community [Member]
Investment [Line Items]
Number of skilled nursing portfolio beds | bed					90
Number of assisted living beds acquired | bed					69
Victory Park Nursing Home And Victoria Retirement Community [Member]
Investment [Line Items]
Acquisition consideration					$ 14,700
Anticipated annual lease revenues					$ 1,400
Shaw Mountain at Cascadia [Member]
Investment [Line Items]
Acquisition consideration				$ 8,900
Leases period				15 years
Leases renewal options | renewal_option				3
Leases renewal term				5 years
Anticipated annual lease revenues				$ 900
Number of skilled nursing portfolio beds | bed				98
English Meadows Elks' Home [Member]
Investment [Line Items]
Number of units available in living facilities | unit				175
Acquisition consideration				$ 10,100
Anticipated annual lease revenues				$ 900
Croatan Village [Member]
Investment [Line Items]
Number of units available in living facilities | unit				46
Countryside Village [Member]
Investment [Line Items]
Number of units available in living facilities | unit				21
Croatan Village And Countryside Village [Member]
Investment [Line Items]
Acquisition consideration				$ 11,800
Leases period				15 years
Leases renewal options | renewal_option				2
Leases renewal term				5 years
Anticipated annual lease revenues				$ 1,000
Premier Senior Living, LLC [Member]
Investment [Line Items]
Acquisition consideration			$ 30,700
Anticipated annual lease revenues			$ 2,500
Number of facilities acquired | facility			4
Number of assisted living beds acquired | bed			188
The Oaks At Petaluma [Member]
Investment [Line Items]
Number of units available in living facilities | unit		59
Acquisition consideration		$ 6,800
Leases period		15 years
Leases renewal options | renewal_option		2
Leases renewal term		5 years
Anticipated annual lease revenues		$ 700
Priority Management Group, LLC [Member]
Investment [Line Items]
Acquisition consideration	$ 95,900
Leases period	15 years
Leases renewal options | renewal_option	2
Leases renewal term	5 years
Anticipated annual lease revenues	$ 8,600
Number of facilities acquired | facility	3							3
Number of campuses acquired | campus	1							1
Off-Market Favorable Lease [Member]
Investment [Line Items]
Number of identified intangible assets | intangible_asset								2
Ensign Master Leases [Member]
Investment [Line Items]
Properties subject to operating lease | facility	93							93
Number of units available in living facilities | unit	154							154
Rental income								$ 56,500
Escalation factor for calculating revenues after year two	0.00%							0.00%
Percentage change in the consumer price index	2.50%							2.50%
Premier Senior Living, LLC [Member]
Investment [Line Items]
Properties subject to operating lease | facility	16							16
Number of units available in living facilities | unit	154							154
Rental income								$ 18,600
Escalation factor for calculating revenues after year two	3.00%							3.00%
Various Other Operators [Member]
Investment [Line Items]
Properties subject to operating lease | facility	42							42
Number of units available in living facilities | unit	154							154