New Construction, Acquisitions, Dispositions and Property Exchange Transaction - Additional Information (Detail)	1 Months Ended					2 Months Ended	3 Months Ended						8 Months Ended	12 Months Ended
	May 31, 2015 USD ($) ft² Property	Feb. 28, 2015 USD ($) ft² Time Building	Dec. 31, 2014 USD ($)	Aug. 31, 2014 USD ($) ft² Property	Jan. 31, 2014 USD ($) ft²	Feb. 28, 2015 USD ($) ft² Property Time	Dec. 31, 2016 USD ($) ft² Time Option	Sep. 30, 2016 USD ($) ft²	Jun. 30, 2016 USD ($) ft²	Mar. 31, 2016 USD ($) ft² Time	Jun. 30, 2015 USD ($)	Mar. 31, 2015 ft² Property	Aug. 31, 2014 USD ($) ft² Property	Dec. 31, 2016 USD ($) ft² Time Option $ / shares	Dec. 31, 2015 USD ($) $ / shares	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Mar. 31, 2017 ft²	Aug. 01, 2014 Property
Business Acquisitions And Dispositions [Line Items]
Total cash paid														$ 60,400,000
Non-recourse third-party debt							$ 7,100,000							$ 7,100,000
Lessor Leasing Arrangements, Operating Leases, Renewal Term														5 years
Deposits on real estate assets															$ 150,000	$ 100,000
Acquired intangible assets include in-place leases amortization period														8 years
Business combination recorded aggregate net revenue														$ 2,400,000
Business combination aggregate net losses generated by properties including cost of borrowings and advisory fee expenses														134,000
Business acquisition, unaudited pro forma net revenues														70,200,000	67,800,000
Business Acquisition, unaudited pro forma net income														$ 16,700,000	$ 22,400,000
Business Acquisition, unaudited pro forma diluted per share | $ / shares														$ 1.24	$ 1.68
Net intangible assets							23,800,000							$ 23,800,000
Intangible assets, accumulated amortization							$ 27,100,000							27,100,000	$ 25,100,000
Cash received for property exchange transaction														$ 0	2,000,000	17,300,000
Gain on property exchange											$ 8,742,000				8,742,000
Aggregate purchase price in connection with the purchase of minority ownership interests				$ 7,000,000									$ 7,000,000
Cash paid for purchase of minority interests in majority-owned LLCs													4,700,000		2,250,000	$ 4,744,000
Payment for acquisition, notes payable				$ 2,300,000									$ 2,300,000
Maturity date, notes payable													Jan. 05, 2015
Percentage of minority ownership interests by parent			100.00%													100.00%
Gain from the remeasurement of fair value																$ 25,409,000
Purchase price allocation, tangible property			$ 84,000,000													84,000,000
Purchase price allocation, identifiable intangible assets			6,500,000													6,500,000
Purchase price allocation, long term debt			29,800,000													29,800,000
The Bridgeway
Business Acquisitions And Dispositions [Line Items]
Cash received for property exchange transaction			17,300,000													$ 17,300,000
Extended lease terms at existing lease rates														2014-12		2014-12
Property at fair value			$ 17,300,000													$ 17,300,000
Gain on divestiture of property																$ 13,000,000
Piedmont Roswell Physician Center Sandy Springs GA
Business Acquisitions And Dispositions [Line Items]
Acquired intangible assets include in-place leases amortization period		15 years												13 years 4 months 24 days
Piedmont Vinings Physician Center Vinings GA
Business Acquisitions And Dispositions [Line Items]
Acquired intangible assets include in-place leases amortization period		15 years												13 years 4 months 24 days
Minimum
Business Acquisitions And Dispositions [Line Items]
Acquired intangible assets include in-place leases amortization period														6 years
Lease agreement period														3 years
Ownership prior to minority interest purchase				85.00%									85.00%
Capitalization Rate																7.00%
Discount rate																8.00%
Maximum
Business Acquisitions And Dispositions [Line Items]
Number of term renewal options | Option							5							5
Acquired intangible assets include in-place leases amortization period														12 years
Lease agreement period														15 years
Ownership prior to minority interest purchase				95.00%									95.00%
Capitalization Rate																8.75%
Discount rate																9.75%
In Place Leases
Business Acquisitions And Dispositions [Line Items]
Renewal Term (years)														4 years 3 months 18 days
Acquired intangible assets include in-place leases amortization period														4 years 3 months 18 days
2704 North Tenaya Way
Business Acquisitions And Dispositions [Line Items]
Net rentable area | ft²							45,000							45,000
Non-recourse third-party debt							$ 7,100,000							$ 7,100,000
Total purchase price							$ 15,300,000
2704 North Tenaya Way | Lease Agreements
Business Acquisitions And Dispositions [Line Items]
Renewal Term (years)							7 years 1 month 6 days
Frederick Memorial Hospital Crestwood
Business Acquisitions And Dispositions [Line Items]
Net rentable area | ft²								62,300
Total purchase price								$ 24,300,000
Frederick Memorial Hospital Crestwood | Lease Agreements
Business Acquisitions And Dispositions [Line Items]
Renewal Term (years)								12 years
Chandler Corporate Center III
Business Acquisitions And Dispositions [Line Items]
Net rentable area | ft²									82,000
Total purchase price									$ 18,000,000
Occupied percentage of property									92.00%
Lease rent escalation period									12 years
Lessor Leasing Arrangements, Operating Leases, Renewal Term									10 years
Chandler Corporate Center III | Lease Agreements
Business Acquisitions And Dispositions [Line Items]
Renewal Term (years)									11 years 3 months 18 days
Madison Professional Office Building
Business Acquisitions And Dispositions [Line Items]
Net rentable area | ft²										30,100
Total purchase price										$ 10,100,000
Deposits on real estate assets															150,000
Madison Professional Office Building | Lease Agreements
Business Acquisitions And Dispositions [Line Items]
Renewal Term (years)										6 years 2 months 12 days
Haas Medical Office Park
Business Acquisitions And Dispositions [Line Items]
Net rentable area | ft²		16,000				16,000
Total purchase price		$ 4,100,000
Acquired intangible assets include in-place leases amortization period		10 years 4 months 24 days												8 years 7 months 6 days
Number of Buildings purchased | Building		2
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
Business Acquisitions And Dispositions [Line Items]
Number of term renewal options | Time		6				6
Additional renewal terms						5 years						5 years
Total purchase price						$ 12,800,000
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
Business Acquisitions And Dispositions [Line Items]
Area of acquired building | ft²		13,600				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
Business Acquisitions And Dispositions [Line Items]
Area of acquired building | ft²		13,600				13,600						13,600
Hanover Emergency Center
Business Acquisitions And Dispositions [Line Items]
Net rentable area | ft²				22,000									22,000
Total purchase price				$ 8,600,000
Acquired intangible assets include in-place leases amortization period				9 years 9 months 18 days										7 years 6 months
Hanover Emergency Center | Lease Agreements
Business Acquisitions And Dispositions [Line Items]
Renewal Term (years)				10 years
Children's Clinic and Northwest Medical Center
Business Acquisitions And Dispositions [Line Items]
Total purchase price					$ 7,200,000
Deposits on real estate assets																	$ 150,000
Acquired intangible assets include in-place leases amortization period				9 years 8 months 12 days										6 years 8 months 12 days
Children's Clinic
Business Acquisitions And Dispositions [Line Items]
Area of acquired building | ft²					9,800
Northwest Medical Center
Business Acquisitions And Dispositions [Line Items]
Area of acquired building | ft²					13,700
August 1, 2014 Acquisitions
Business Acquisitions And Dispositions [Line Items]
Acquired intangible assets include in-place leases amortization period				4 years 8 months 12 days										4 years
January 1, 2014 Acquisitions
Business Acquisitions And Dispositions [Line Items]
Acquired intangible assets include in-place leases amortization period					5 years 3 months 18 days									3 years 10 months 24 days
Universal Health Services, Inc
Business Acquisitions And Dispositions [Line Items]
Number of term renewal options | Time							6							6
Additional renewal terms														5 years
Extended lease terms at existing lease rates														2021-12
Limited Liability Companies
Business Acquisitions And Dispositions [Line Items]
Number of real estate investments | Property				8									8						6
Henderson Medical Plaza | Universal Health Services, Inc
Business Acquisitions And Dispositions [Line Items]
Maximum amount of investment for development and construction										$ 21,100,000
Ground lease agreement period										75 years
Number of term renewal options | Time										2
Additional renewal terms										10 years
Amount invested in MOB under construction							$ 9,500,000			$ 9,500,000				$ 9,500,000
Henderson Medical Plaza | Universal Health Services, Inc | Scenario, Forecast
Business Acquisitions And Dispositions [Line Items]
Net rentable area | ft²																		78,800
Sheffield Medical Building
Business Acquisitions And Dispositions [Line Items]
Net rentable area | ft²	36,700
Cash received for property exchange transaction	$ 2,000,000
Area of disposed building | ft²	73,446
Number of assets acquired | Property	2
Percentage of rentable area covered by the agreement	100.00%
Lease agreement period	15 years
Percentage of annual rent increase	3.00%
Gain on property exchange															$ 8,700,000