Acquisitions and Disposition - 2014 Acquisitions (Details) $ in Thousands																								12 Months Ended
	Dec. 30, 2014 USD ($) buildings	Dec. 18, 2014 USD ($)	Nov. 26, 2014 USD ($) buildings	Nov. 20, 2014 USD ($) buildings	Oct. 29, 2014 USD ($) buildings	Sep. 30, 2014 USD ($) buildings shares	Sep. 10, 2014 USD ($)	Sep. 05, 2014 USD ($) shares	Sep. 02, 2014 USD ($)	Jul. 31, 2014 USD ($)	Jul. 28, 2014 USD ($)	Jul. 25, 2014 USD ($)	Jul. 01, 2014 USD ($) buildings shares	Jun. 30, 2014 USD ($)	May. 28, 2014 USD ($) shares	May. 23, 2014 USD ($) shares	Apr. 30, 2014 USD ($)	Apr. 22, 2014 USD ($) buildings	Mar. 28, 2014 USD ($)	Feb. 28, 2014 USD ($)	Feb. 26, 2014 USD ($) buildings	Feb. 19, 2014 USD ($) buildings	Jul. 24, 2013 properties	Dec. 31, 2015 USD ($) states healthcareproperty	Dec. 31, 2014 USD ($) properties states
Business Acquisition [Line Items]
Number of operating healthcare properties																								66	61
Number of states in which operating healthcare properties and land parcel located | states																								22	15
Number of medical office buildings | properties																							19
Acquisition price																								$ 840,958	$ 543,436
Foundations San Antonio Surgical Hospital
Business Acquisition [Line Items]
Acquisition price																						$ 25,556
Eagles Landing Family Practice 4 MOBs
Business Acquisition [Line Items]
Number of medical office buildings | buildings																						4
Acquisition price																						$ 20,800
21st Century Oncology 4 MOBs
Business Acquisition [Line Items]
Number of medical office buildings | buildings																					4
Acquisition price																					$ 17,486
Foundations San Antonio MOB
Business Acquisition [Line Items]
Acquisition price																				$ 6,800
Peachtree Dunwoody MOB
Business Acquisition [Line Items]
Acquisition price																				$ 36,726
LifeCare LTACH
Business Acquisition [Line Items]
Acquisition price																			$ 27,160
LifeCare LTACH
Business Acquisition [Line Items]
Acquisition price																			$ 12,840
Pinnacle Health Cardiology Portfolio 2 MOBs
Business Acquisition [Line Items]
Number of medical office buildings | buildings																		2
Acquisition price																		$ 9,208
South Bend Orthopaedic MOB
Business Acquisition [Line Items]
Acquisition price																	$ 14,900
Grenada Medical Complex MOB
Business Acquisition [Line Items]
Acquisition price																	$ 7,100
Mississippi Sports Medicine and Orthopaedics Center MOB
Business Acquisition [Line Items]
Acquisition price																$ 16,700
Carmel Medical Pavilion MOB
Business Acquisition [Line Items]
Acquisition price															$ 4,664
Summit Urology MOB
Business Acquisition [Line Items]
Acquisition price														$ 4,783
Renaissance Center
Business Acquisition [Line Items]
Acquisition price														8,500
Presbyterian Medical Plaza MOB
Business Acquisition [Line Items]
Acquisition price														$ 7,750
Landmark Medical Portfolio (Premier) 3 MOBs
Business Acquisition [Line Items]
Number of medical office buildings | buildings													3
Acquisition price													$ 23,837
Carlisle II MOB
Business Acquisition [Line Items]
Acquisition price												$ 4,500
Surgical Institute of Monroe ASC
Business Acquisition [Line Items]
Acquisition price											$ 6,000
The Oaks Medical Building MOB
Business Acquisition [Line Items]
Acquisition price										$ 10,600
Baylor Surgicare ASC — Mansfield
Business Acquisition [Line Items]
Acquisition price									$ 8,500
Eye Center of Southern Indiana
Business Acquisition [Line Items]
Acquisition price								$ 12,174
Wayne State Medical Center and MOB
Business Acquisition [Line Items]
Acquisition price							$ 46,500
El Paso Portfolio (specialty surgical hospital and 2 MOBs)
Business Acquisition [Line Items]
Number of medical office buildings | buildings						2,000
Acquisition price						$ 46,235
The Mark H. Zangmeister Center
Business Acquisition [Line Items]
Acquisition price						36,600
Berger Medical Center
Business Acquisition [Line Items]
Acquisition price						$ 6,785
Orthopedic One 2 MOBs
Business Acquisition [Line Items]
Number of medical office buildings | buildings						2
Acquisition price						$ 24,500
Pinnacle Health Portfolio 5 MOBs
Business Acquisition [Line Items]
Number of medical office buildings | buildings					5
Acquisition price					$ 23,100
Columbus Regional Health Portfolio 12 MOBs Columbus Regional Health Portfolio 1 MOB
Business Acquisition [Line Items]
Acquisition price				$ 27,997
Middletown Medical 2 MOBs
Business Acquisition [Line Items]
Number of medical office buildings | buildings			2
Acquisition price			$ 14,399
Carle Danville Clinic MOB
Business Acquisition [Line Items]
Acquisition price			$ 10,300
Napoleon Medical Building MOB
Business Acquisition [Line Items]
Acquisition price		$ 10,500
West Tennessee Bone & Joint 1 MOB 1 ASC
Business Acquisition [Line Items]
Number of medical office buildings | buildings	1
Number of ambulatory surgical centers | buildings	1,000
Acquisition price	$ 9,936
Operating Partnership | Mississippi Sports Medicine and Orthopaedics Center MOB
Business Acquisition [Line Items]
Number of units issued for funding purchase price (in shares) | shares																147,659
Value of units issued for funding purchase price																$ 1,900
Operating Partnership | Carmel Medical Pavilion MOB
Business Acquisition [Line Items]
Number of units issued for funding purchase price (in shares) | shares															96,099
Value of units issued for funding purchase price															$ 1,200
Operating Partnership | Landmark Medical Portfolio (Premier) 3 MOBs
Business Acquisition [Line Items]
Number of units issued for funding purchase price (in shares) | shares													576,040
Value of units issued for funding purchase price													$ 8,300
Operating Partnership | Eye Center of Southern Indiana
Business Acquisition [Line Items]
Number of units issued for funding purchase price (in shares) | shares								272,191
Value of units issued for funding purchase price								$ 4,000
Operating Partnership | El Paso Portfolio (specialty surgical hospital and 2 MOBs)
Business Acquisition [Line Items]
Number of units issued for funding purchase price (in shares) | shares						950,324
Value of units issued for funding purchase price						$ 13,200
Georgia | Columbus Regional Health Portfolio 12 MOBs Columbus Regional Health Portfolio 1 MOB
Business Acquisition [Line Items]
Number of medical office buildings | buildings				12
Alabama | Columbus Regional Health Portfolio 12 MOBs Columbus Regional Health Portfolio 1 MOB
Business Acquisition [Line Items]
Number of medical office buildings | buildings				1,000