Property Exchange Transaction, Acquisitions, Dispositions and New Construction - Additional Information (Detail)		1 Months Ended							2 Months Ended	3 Months Ended			12 Months Ended
		Aug. 31, 2015 USD ($) ft²	May. 31, 2015 USD ($) ft² Property	Feb. 28, 2015 USD ($) ft² Time Building	Dec. 31, 2014 USD ($) Property	Aug. 31, 2014	Jan. 31, 2014 USD ($) ft²	Apr. 30, 2013 ft²	Feb. 28, 2015 USD ($) ft² Property Time	Jun. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) Property Time Option	Dec. 31, 2014 USD ($) Property	Dec. 31, 2013 USD ($)	Aug. 01, 2014 Property	Jan. 01, 2014 Property	Aug. 31, 2013 USD ($) ft²	Jun. 30, 2013 USD ($) ft²
Business Acquisitions And Dispositions [Line Items]
Cash received for property exchange transaction													$ 2,000,000	$ 17,300,000	$ 0
Net rentable area | ft²				16,000					16,000
Gain on property exchange										$ 8,742,000			8,742,000
Number of Buildings purchased | Building				2
Total purchase price				$ 4,100,000					$ 4,100,000
Deposits on real estate assets													150,000	100,000	150,000
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													$ 2,250,000	4,744,000
Payment for acquisition, notes payable					$ 2,300,000									$ 2,300,000
Maturity date, notes payable														Jan. 05, 2015
Number of real estate investments | Property													62
Percentage of minority ownership interests by parent					100.00%									100.00%
Gain from the remeasurement of fair value	[1]										$ 25,093,000	$ 316,000		$ 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
Net intangible assets													$ 19,800,000
Intangible assets, accumulated amortization					19,700,000								$ 25,100,000	19,700,000
In Place Leases
Business Acquisitions And Dispositions [Line Items]
Intangible assets amortization period at date of acquisition													4 years 1 month 6 days
The Bridgeway
Business Acquisitions And Dispositions [Line Items]
Cash received for property exchange transaction					17,300,000									$ 17,300,000
Lease term scheduled end date													2014-12	2014-12
Property at fair value					$ 17,300,000									$ 17,300,000
Gain on divestiture of property														$ 13,000,000
Minimum
Business Acquisitions And Dispositions [Line Items]
Ownership prior to minority interest purchase					85.00%									85.00%
Capitalization Rate														7.00%
Discount rate														8.00%
Non-controlling ownership interest													33.00%
Maximum
Business Acquisitions And Dispositions [Line Items]
Number of term renewal options | Option													5
Ownership prior to minority interest purchase					95.00%									95.00%
Capitalization Rate														8.75%
Discount rate														9.75%
Non-controlling ownership interest													95.00%
Piedmont Roswell Physician Center Sandy Springs GA
Business Acquisitions And Dispositions [Line Items]
Intangible assets amortization period at date of acquisition				15 years									14 years 4 months 24 days
Piedmont Vinings Physician Center Vinings GA
Business Acquisitions And Dispositions [Line Items]
Intangible assets amortization period at date of acquisition				15 years									14 years 4 months 24 days
Haas Medical Office Park
Business Acquisitions And Dispositions [Line Items]
Intangible assets amortization period at date of acquisition				10 years 4 months 24 days									9 years 7 months 6 days
Mission and Weslaco Freestanding Emergency Departments
Business Acquisitions And Dispositions [Line Items]
Lease agreement period									10 years
Total purchase price				$ 12,800,000					$ 12,800,000
Number of real properties purchased | Property									2
Area of acquired building | ft²				13,600					13,600
Number of real estate investments | Property													3
Universal Health Services, Inc
Business Acquisitions And Dispositions [Line Items]
Number of term renewal options | Time													6
Additional renewal terms													5 years
Lease term scheduled end date													2016-12
Universal Health Services, Inc | Mission and Weslaco Freestanding Emergency Departments
Business Acquisitions And Dispositions [Line Items]
Number of term renewal options | Time				6					6
Additional renewal terms									5 years
Limited Liability Companies
Business Acquisitions And Dispositions [Line Items]
Number of real estate investments | Property					8									8		6	6
2 MOBs ("exchange properties")
Business Acquisitions And Dispositions [Line Items]
Number of assets acquired | Property			2
Percentage of rentable area covered by the agreement			100.00%
Net rentable area | ft²			36,700
Lease agreement period			15 years
Percentage of annual rent increase			3.00%
Hanover Emergency Center
Business Acquisitions And Dispositions [Line Items]
Net rentable area | ft²		22,000
Total purchase price		$ 8,600,000
Intangible assets amortization period at date of acquisition						9 years 9 months 18 days							8 years 6 months
Lease term		10 years
Children's Clinic and Northwest Medical Center
Business Acquisitions And Dispositions [Line Items]
Intangible assets amortization period at date of acquisition						9 years 8 months 12 days							7 years 8 months 12 days
Net cash paid for acquisition of medical office buildings							$ 7,200,000
Deposits on real estate assets															150,000,000
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]
Intangible assets amortization period at date of acquisition						4 years 8 months 12 days							4 years 1 month 6 days
January 1, 2014 Acquisitions
Business Acquisitions And Dispositions [Line Items]
Intangible assets amortization period at date of acquisition							5 years 3 months 18 days						4 years 8 months 12 days
Ward Eagle Office Village Medical Office Building
Business Acquisitions And Dispositions [Line Items]
Net rentable area | ft²																		16,300
Total purchase price																		$ 4,100,000
5004 Poole Road MOB Office building
Business Acquisitions And Dispositions [Line Items]
Net rentable area | ft²																			4,400
Total purchase price																			$ 625,000
2013 Acquisitions
Business Acquisitions And Dispositions [Line Items]
Total purchase price															$ 4,700,000
Intangible assets amortization period at date of acquisition													7 years 4 months 24 days		9 years 9 months 18 days
Aggregate purchase price in connection with the purchase of minority ownership interests															$ 4,685,000
Payment for acquisition, notes payable															11,000
Purchase price allocation, identifiable intangible assets															$ 610,000
Forney Medical Plaza
Business Acquisitions And Dispositions [Line Items]
Rentable medical office building | ft²								30,000
Non-controlling ownership interest								95.00%
Sheffield Medical Building Atlanta, Georgia
Business Acquisitions And Dispositions [Line Items]
Area of disposed building | ft²			73,446
Cash received for property exchange transaction			$ 2,000,000

[1] We began to account for Palmdale Medical Properties and Sparks Medical Properties on a consolidated basis effective January 1, 2014. Additionally, we began to account for six LLCs (Desert Valley Medical Center, Santa Fe Professional Plaza, Rosenberg Children’s Medical Plaza, Sierra San Antonio Medical Plaza, Phoenix Children’s East Valley Care Center and 3811 E. Bell Medical Building Medical Plaza) on a consolidated basis as of August 1, 2014.