Relationship with UHS and Related Party Transactions - Additional Information (Detail)	1 Months Ended		2 Months Ended	3 Months Ended		12 Months Ended					60 Months Ended
	Jun. 30, 2016 Subsidiary	Dec. 31, 2014 USD ($)	Feb. 28, 2015 ft² Property Time	Mar. 31, 2016 USD ($) Time	Mar. 31, 2015 USD ($) ft² Property	Dec. 31, 2016 USD ($) Property Time Option	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2016 USD ($) Property Time Option	Mar. 31, 2017 ft²
Related Party Transaction [Line Items]
Proceeds from sale of real property						$ 0	$ 2,000,000	$ 17,300,000
Annual advisory fee as percentage of average invested real estate assets		0.70%				0.70%	0.70%	0.70%			0.70%
Advisory fee						$ 3,263,000	$ 2,810,000	$ 2,545,000
The Bridgeway
Related Party Transaction [Line Items]
Extended lease terms at existing lease rates						2014-12		2014-12
Proceeds from sale of real property		$ 17,300,000						$ 17,300,000
Gain on divestiture of property								13,000,000
Amount of annual lease earned								$ 1,100,000	$ 1,100,000	$ 1,100,000
Wholly Owned Subsidiaries Of U H S Real Property Of Two Newly Constructed And Recently Opened F E Ds Located In Weslaco And Mission Texas
Related Party Transaction [Line Items]
Number of term renewal options | Time			6
Additional renewal terms			5 years		5 years
Number of real properties purchased | Property			2		2
Lease agreement period			10 years		10 years
Wholly Owned Subsidiaries Of U H S Real Property Of Two Newly Constructed And Recently Opened F E Ds Located In Weslaco And Mission Texas | Recently Opened Free Standing Emergency Departments | Weslaco
Related Party Transaction [Line Items]
Area of acquired building | ft²			13,600		13,600
Wholly Owned Subsidiaries Of U H S Real Property Of Two Newly Constructed And Recently Opened F E Ds Located In Weslaco And Mission Texas | Recently Opened Free Standing Emergency Departments | Mission
Related Party Transaction [Line Items]
Area of acquired building | ft²			13,600		13,600
Mission and Weslaco Freestanding Emergency Departments
Related Party Transaction [Line Items]
Estimated acquisition cost of free-standing emergency departments					$ 12,800,000
Estimated rental revenues					$ 900,000
Mission and Weslaco Freestanding Emergency Departments | First four renewal options
Related Party Transaction [Line Items]
Percentage increase in annual lease rate					2.00%
Minimum | Mission and Weslaco Freestanding Emergency Departments | First four renewal options
Related Party Transaction [Line Items]
Additional renewal terms, covering year					2025
Minimum | Mission and Weslaco Freestanding Emergency Departments | Last two renewal options
Related Party Transaction [Line Items]
Additional renewal terms, covering year					2045
Minimum | 5 Unconsolidated Limited Liability Companies
Related Party Transaction [Line Items]
Non-controlling equity interest, ownership percentage						33.00%					33.00%
Maximum
Related Party Transaction [Line Items]
Number of term renewal options | Option						5					5
Maximum | Mission and Weslaco Freestanding Emergency Departments | First four renewal options
Related Party Transaction [Line Items]
Additional renewal terms, covering year					2044
Maximum | Mission and Weslaco Freestanding Emergency Departments | Last two renewal options
Related Party Transaction [Line Items]
Additional renewal terms, covering year					2054
Maximum | 5 Unconsolidated Limited Liability Companies
Related Party Transaction [Line Items]
Non-controlling equity interest, ownership percentage						95.00%					95.00%
Universal Health Services, Inc
Related Party Transaction [Line Items]
Number of term renewal options | Time						6					6
Additional renewal terms						5 years
Number of medical office buildings and free standing emergency departments | Property						17
Option to renew lease, notice period prior to termination date of current term						90 days
Period to purchase respective leased facilities at same price after lease terms						180 days
Renewal period of respective leased facilities at same price after lease terms						180 days
Number of wholly-owned subsidiaries | Subsidiary	3
Extended lease terms at existing lease rates						2021-12
Number of renewal options at existing lease rates | Time						3
Percentage ownership of outstanding shares						5.80%	5.90%				5.80%
Universal Health Services, Inc | Henderson Medical Plaza
Related Party Transaction [Line Items]
Number of term renewal options | Time				2
Additional renewal terms				10 years
Maximum amount of investment for development and construction				$ 21,100,000
Ground lease agreement period				75 years
Amount invested in MOB under construction				$ 9,500,000		$ 9,500,000					$ 9,500,000
Universal Health Services, Inc | Scenario, Forecast | Henderson Medical Plaza
Related Party Transaction [Line Items]
Net rentable area | ft²												78,800
Universal Health Services, Inc | Customer Concentration Risk | Revenues
Related Party Transaction [Line Items]
Percentage of revenues generated from leases						24.00%	25.00%	28.00%			27.00%
Universal Health Services, Inc | Customer Concentration Risk | Combined consolidated and unconsolidated revenue
Related Party Transaction [Line Items]
Percentage of revenues generated from leases						19.00%	20.00%	22.00%			21.00%
Universal Health Services, Inc | Hospital Facilities Leased
Related Party Transaction [Line Items]
Number of hospital facilities leased | Property						3					3
Universal Health Services, Inc | Minimum
Related Party Transaction [Line Items]
Initial lease terms						13 years
Universal Health Services, Inc | Maximum
Related Party Transaction [Line Items]
Initial lease terms						15 years
Universal Health Services of Delaware Inc
Related Party Transaction [Line Items]
Annual incentive fee to Advisor as percentage of cash available for distribution						20.00%					20.00%
Incentive fees						$ 0	$ 0	$ 0
Advisory fee						3,300,000	2,800,000	2,500,000
Average invested real estate assets						$ 466,000,000	$ 401,000,000	$ 363,000,000
Universal Health Services of Delaware Inc | Minimum
Related Party Transaction [Line Items]
Percentage of equity to be exceeded for incentive distribution						15.00%					15.00%