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Lease expiration year.

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Percentage of taxable income distributed and continue to distribute to shareholders for federal income tax exemption.

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Percentage Of Taxable Income To Be Distributed For Federal Income Tax Exemption

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Significant Accounting Policies [Line Items]

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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The number of real estate properties owned as of the balance sheet date.

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The number of states the entity operates in as of the balance sheet date.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Cost basis of real estate investments for federal income tax purposes for entities with a substantial portion of business acquiring and holding investment real estate.

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The aggregate cost of investments for Federal income tax purposes.

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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions	12 Months Ended			60 Months Ended
	Dec. 31, 2017 USD ($) Property	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 USD ($) Property	Feb. 28, 2018 Property State
Significant Accounting Policies [Line Items]
Intangible assets, estimated aggregate amortization expenses for 2018 \| $	$ 3.7			$ 3.7
Intangible assets, estimated aggregate amortization expenses for 2019 \| $	3.1			3.1
Intangible assets, estimated aggregate amortization expenses for 2020 \| $	2.9			2.9
Intangible assets, estimated aggregate amortization expenses for 2021 \| $	2.5			2.5
Intangible assets, estimated aggregate amortization expenses for 2022 \| $	1.8			1.8
Amortization expense, intangible assets \| $	4.9	$ 5.1	$ 5.5
Depreciation expense \| $	$ 19.7	17.4	$ 16.2
Percentage of annual REIT taxable income distributed and continue to distribute to remain exempt from federal income taxes	100.00%
Federal excise tax rate when amount of 85% of ordinary income plus 95% of any capital gain income exceeds cash distributions	4.00%
Gross cost basis of properties for federal income tax purposes \| $	$ 584.0	561.0		584.0
Net book value of the properties for federal income tax purposes \| $	$ 384.0	$ 385.0		$ 384.0
In Place Leases
Significant Accounting Policies [Line Items]
Intangible asset, useful life	4 years 4 months 24 days
Minimum
Significant Accounting Policies [Line Items]
Percentage of annual REIT taxable income that should be distributed to remain exempt from federal income taxes	90.00%
Minimum \| 4 Unconsolidated Limited Liability Companies / Limited Partner
Significant Accounting Policies [Line Items]
Non-controlling equity interest, ownership percentage	33.00%			33.00%
Maximum \| 4 Unconsolidated Limited Liability Companies / Limited Partner
Significant Accounting Policies [Line Items]
Non-controlling equity interest, ownership percentage	95.00%			95.00%
Buildings \| Minimum
Significant Accounting Policies [Line Items]
Estimated original useful lives of property plant and equipment	25 years
Buildings \| Maximum
Significant Accounting Policies [Line Items]
Estimated original useful lives of property plant and equipment	45 years
Capital Improvements \| Minimum
Significant Accounting Policies [Line Items]
Estimated original useful lives of property plant and equipment	3 years
Capital Improvements \| Maximum
Significant Accounting Policies [Line Items]
Estimated original useful lives of property plant and equipment	35 years
Universal Health Services, Inc \| Customer Concentration Risk \| Revenues
Significant Accounting Policies [Line Items]
Percentage of rental revenue	22.00%	24.00%	25.00%	25.00%
Universal Health Services, Inc \| Hospital Facilities Leased
Significant Accounting Policies [Line Items]
Number of real estate investments	3			3
McAllen Medical Center \| Customer Concentration Risk \| Revenues
Significant Accounting Policies [Line Items]
Percentage of rental revenue	10.00%	10.00%	11.00%
Medical office buildings \| Limited Liability Companies
Significant Accounting Policies [Line Items]
Number of real estate investments	4			4
Hospital facilities expire in 2019
Significant Accounting Policies [Line Items]
Number of real estate investments	2			2
Lease expiration year	2019
Hospital facilities expire in 2021
Significant Accounting Policies [Line Items]
Number of real estate investments	4			4
Lease expiration year	2021
Scenario, Forecast
Significant Accounting Policies [Line Items]
Number of real estate investments					68
Number of states that real estate investments are located \| State					20
Scenario, Forecast \| Hospitals
Significant Accounting Policies [Line Items]
Number of real estate investments					6
Scenario, Forecast \| Hospitals \| Acute Care
Significant Accounting Policies [Line Items]
Number of real estate investments					3
Scenario, Forecast \| Hospitals \| Rehabilitation
Significant Accounting Policies [Line Items]
Number of real estate investments					1
Scenario, Forecast \| Hospitals \| Sub-acute
Significant Accounting Policies [Line Items]
Number of real estate investments					2
Scenario, Forecast \| Mission and Weslaco Freestanding Emergency Departments
Significant Accounting Policies [Line Items]
Number of real estate investments					4
Scenario, Forecast \| Medical office buildings
Significant Accounting Policies [Line Items]
Number of real estate investments					54
Scenario, Forecast \| Medical office buildings \| Majority Owned Subsidiary Unconsolidated
Significant Accounting Policies [Line Items]
Number of real estate investments					4
Scenario, Forecast \| Medical office buildings \| Limited Liability Companies ("LLCs")/ Limited Liability Partnerships ("LPs")
Significant Accounting Policies [Line Items]
Number of real estate investments					4
Scenario, Forecast \| Preschool and childcare Centers
Significant Accounting Policies [Line Items]
Number of real estate investments					4