Acquisitions and Disposition (Details)													3 Months Ended				9 Months Ended
	Sep. 30, 2015 USD ($) ft² states	Sep. 09, 2015 USD ($)	Sep. 01, 2015 USD ($)	Aug. 31, 2015 USD ($)	Aug. 21, 2015 USD ($)	Aug. 19, 2015 USD ($)	Aug. 14, 2015 USD ($)	Jul. 31, 2015 USD ($) ft²	Jul. 24, 2015 USD ($)	Jul. 17, 2015 USD ($)	Jun. 01, 2015 USD ($)	Jan. 28, 2015 USD ($) shares	Sep. 30, 2015 USD ($) ft² states shares	Jun. 30, 2015 USD ($) shares	Mar. 31, 2015 USD ($) shares	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) ft² states healthcareproperty	Sep. 30, 2014 USD ($)	Mar. 26, 2015 ft²
Acquisitions and Disposition
Acquisition price																	$ 297,131,000
Acquisition expenses													$ 3,257,000			$ 2,922,000	11,764,000	$ 9,254,000
Revenue													34,870,000			14,161,000	89,037,000	33,640,000
Net income													3,983,000			$ (2,251,000)	6,832,000	$ (6,409,000)
Fair values of the assets acquired and the liabilities assumed
Land	$ 44,675,000												44,675,000				44,675,000
Building and improvements	526,670,000												526,670,000				526,670,000
Lease inducement	2,478,000												2,478,000				2,478,000
Contingent consideration	(1,482,000)												(1,482,000)				(1,482,000)
Receivables	3,564,000												3,564,000				3,564,000
Debt assumed	(18,690,000)												(18,690,000)				(18,690,000)
Issuance of OP Units	(10,973,000)												(10,973,000)				(10,973,000)
Noncontrolling interest	(5,508,000)												(5,508,000)				(5,508,000)
Net assets acquired	632,366,000												632,366,000				632,366,000
Series A Preferred units
Fair values of the assets acquired and the liabilities assumed
Issuance of Series A Preferred Units	(9,704,000)												(9,704,000)				(9,704,000)
In-place leases
Fair values of the assets acquired and the liabilities assumed
In-place leases	77,174,000												77,174,000				77,174,000
Above market leases
Fair values of the assets acquired and the liabilities assumed
In-place leases	13,917,000												13,917,000				13,917,000
Below market in-place lease
Fair values of the assets acquired and the liabilities assumed
Intangible leases	(2,625,000)												(2,625,000)				(2,625,000)
Below Market Ground Lease
Fair values of the assets acquired and the liabilities assumed
Intangible leases	$ (12,870,000)												$ (12,870,000)				$ (12,870,000)
Medical Building
Acquisitions and Disposition
Area of property (in square feet) | ft²								26,783											20,329
Series of Individually Immaterial Business Acquisitions
Acquisitions and Disposition
Number of Operating Healthcare Properties | healthcareproperty																	47
Number of states | states	18												18				18
Acquisition price																	$ 676,000,000
Revenue													$ 13,000,000				23,100,000
Net income													3,800,000				5,700,000
Jacksonville F L | Medical Building | Mezzanine loan
Acquisitions and Disposition
Acquisition price											$ 9,000,000
Operating Partnership
Acquisitions and Disposition
Acquisition price													$ 11,200,000	$ 11,300,000	$ 10,000,000
Operating Partnership | Units
Acquisitions and Disposition
Number of units issued for funding purchase price | shares													16,866	210,820	420,963
Value of units issued for funding purchase price	$ 200,000												$ 200,000	$ 3,400,000	$ 7,300,000		200,000
Operating Partnership | Elgin, IL | Medical office building condominium unit
Acquisitions and Disposition
Acquisition price										$ 1,750,000
Operating Partnership | Atlantis, FL | Medical Building
Acquisitions and Disposition
Acquisition price									$ 11,051,000
Operating Partnership | Kennewick WA | Medical Building
Acquisitions and Disposition
Acquisition price								$ 64,000,000
Operating Partnership | Grove City, OH
Acquisitions and Disposition
Acquisition price								$ 11,460,000
Operating Partnership | Phoenix AZ | Medical office building condominium unit
Acquisitions and Disposition
Acquisition price							$ 31,814,000
Operating Partnership | Avondale AZ | Medical office building condominium unit
Acquisitions and Disposition
Acquisition price						$ 22,144,000
Operating Partnership | Goodyear AZ | Medical office building condominium unit
Acquisitions and Disposition
Acquisition price						$ 35,184,000
Operating Partnership | Phoenix AZ II | Medical office building condominium unit
Acquisitions and Disposition
Acquisition price				$ 51,740,000
Operating Partnership | Kyle TX | Medical office building condominium unit
Acquisitions and Disposition
Acquisition price					$ 3,100,000
Mezzanine term loan	$ 3,100,000												$ 3,100,000				$ 3,100,000
Area of property (in square feet) | ft²	54,500												54,500				54,500
Interest rate	$ 0.085												$ 0.085				$ 0.085
Operating Partnership | Katy TX | Medical office building condominium unit
Acquisitions and Disposition
Acquisition price			$ 40,400,000
Operating Partnership | New Albany OH | Medical office building condominium unit
Acquisitions and Disposition
Acquisition price		$ 11,200,000
Operating Partnership | Fountain Hills AZ | Medical office building condominium unit
Acquisitions and Disposition
Acquisition price	13,250,000
Operating Partnership | Greenwood I N | Units
Acquisitions and Disposition
Number of units issued for funding purchase price | shares												16,866
Value of units issued for funding purchase price												$ 200,000
1st Quarter
Fair values of the assets acquired and the liabilities assumed
Land	21,075,000												21,075,000				21,075,000
Building and improvements	175,050,000												175,050,000				175,050,000
Lease inducement	462,000												462,000				462,000
Contingent consideration	(1,482,000)												(1,482,000)				(1,482,000)
Receivables	3,564,000												3,564,000				3,564,000
Debt assumed	(6,323,000)												(6,323,000)				(6,323,000)
Issuance of OP Units	(7,314,000)												(7,314,000)				(7,314,000)
Noncontrolling interest	(5,508,000)												(5,508,000)				(5,508,000)
Net assets acquired	205,740,000												205,740,000				205,740,000
1st Quarter | Series A Preferred units
Fair values of the assets acquired and the liabilities assumed
Issuance of Series A Preferred Units	(9,704,000)												(9,704,000)				(9,704,000)
1st Quarter | In-place leases
Fair values of the assets acquired and the liabilities assumed
In-place leases	32,398,000												32,398,000				32,398,000
1st Quarter | Above market leases
Fair values of the assets acquired and the liabilities assumed
In-place leases	3,679,000												3,679,000				3,679,000
1st Quarter | Below market in-place lease
Fair values of the assets acquired and the liabilities assumed
Intangible leases	(315,000)												(315,000)				(315,000)
1st Quarter | Below Market Ground Lease
Fair values of the assets acquired and the liabilities assumed
Intangible leases	(158,000)												(158,000)				(158,000)
2nd Quarter
Fair values of the assets acquired and the liabilities assumed
Land	10,401,000												10,401,000				10,401,000
Building and improvements	113,411,000												113,411,000				113,411,000
Lease inducement	1,983,000												1,983,000				1,983,000
Debt assumed	(12,367,000)												(12,367,000)				(12,367,000)
Issuance of OP Units	(3,420,000)												(3,420,000)				(3,420,000)
Net assets acquired	132,833,000												132,833,000				132,833,000
2nd Quarter | In-place leases
Fair values of the assets acquired and the liabilities assumed
In-place leases	13,651,000												13,651,000				13,651,000
2nd Quarter | Above market leases
Fair values of the assets acquired and the liabilities assumed
In-place leases	7,950,000												7,950,000				7,950,000
2nd Quarter | Below market in-place lease
Fair values of the assets acquired and the liabilities assumed
Intangible leases	(258,000)												(258,000)				(258,000)
2nd Quarter | Below Market Ground Lease
Fair values of the assets acquired and the liabilities assumed
Intangible leases	(1,482,000)												(1,482,000)				(1,482,000)
3rd Quarter
Fair values of the assets acquired and the liabilities assumed
Land	13,199,000												13,199,000				13,199,000
Building and improvements	238,209,000												238,209,000				238,209,000
Lease inducement	33,000												33,000				33,000
Issuance of OP Units	(239,000)												(239,000)				(239,000)
Noncontrolling interest	0												0				0
Net assets acquired	293,793,000												293,793,000				293,793,000
3rd Quarter | Series A Preferred units
Fair values of the assets acquired and the liabilities assumed
Issuance of Series A Preferred Units	0												0				0
3rd Quarter | In-place leases
Fair values of the assets acquired and the liabilities assumed
In-place leases	31,125,000												31,125,000				31,125,000
3rd Quarter | Above market leases
Fair values of the assets acquired and the liabilities assumed
In-place leases	2,288,000												2,288,000				2,288,000
3rd Quarter | Below market in-place lease
Fair values of the assets acquired and the liabilities assumed
Intangible leases	(2,052,000)												(2,052,000)				(2,052,000)
3rd Quarter | Below Market Ground Lease
Fair values of the assets acquired and the liabilities assumed
Intangible leases	$ (11,230,000)												$ (11,230,000)				$ (11,230,000)