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Real Estate and Loans Receivable - 2015 Activity - Additional Information (Detail) $ in Thousands												1 Months Ended		12 Months Ended
	Dec. 31, 2015 EUR (€) Property Hospital	Dec. 03, 2015 EUR (€) Bed	Nov. 18, 2015 EUR (€) Facility	Oct. 30, 2015 USD ($)	Sep. 30, 2015 USD ($) Hospital	Sep. 09, 2015 EUR (€)	Aug. 31, 2015 USD ($) Investment Bed	Jun. 16, 2015 USD ($) RenewalOptions Property Bed	Apr. 29, 2015 EUR (€) Hospital	Feb. 27, 2015 USD ($) RenewalOptions	Feb. 13, 2015 USD ($) Facility RenewalOptions	Aug. 31, 2015 Investment Property Leases	Jul. 31, 2015 USD ($) Investment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Mortgage financing														$ 717,928	$ 612,836	$ 380,000
Mortgage financing funded															$ 310,000	20,000
2015 [Member] \| Lake Huron Medical Center [Member]
Business Acquisition [Line Items]
Acquisition costs																20,000
Mortgage financing							$ 30,000
Mortgage financing term							5 years
2015 [Member] \| Ernest [Member]
Business Acquisition [Line Items]
Acquisition costs								$ 31,500
Loans provided for acquisition								$ 12,000
Term of lease, years								20 years
Number of lease extension options \| RenewalOptions								3
Term of lease extension, years								5 years
Lease agreement, end date								2035-06
Number of properties acquired \| Property								2
2015 [Member] \| AXA Real Estate [Member]
Business Acquisition [Line Items]
Ownership interest in joint venture under the equity method						50.00%
2015 [Member] \| Acute Care Hospital [Member]
Business Acquisition [Line Items]
Number of facilities acquired \| Facility			7
Purchase price of acquisition \| €			€ 90,000,000
2015 [Member] \| Acute Care Hospital [Member] \| Ernest [Member]
Business Acquisition [Line Items]
Number of beds acquired \| Bed								37
2015 [Member] \| Acute Care Hospital [Member] \| AXA Real Estate [Member]
Business Acquisition [Line Items]
Ownership interest in joint venture under the equity method			50.00%
Estimated total development cost \| €						€ 21,000,000
2015 [Member] \| Acute Care Hospital [Member] \| Kansas [Member]
Business Acquisition [Line Items]
Term of lease, years											10 years
Number of lease extension options \| RenewalOptions											2
Term of lease extension, years											5 years
Lease agreement, end date											2025-02
Number of facilities acquired \| Facility											2
Purchase price of acquisition											$ 110,000
Mortgage financing											$ 40,000
Mortgage financing term											10 years
2015 [Member] \| RHM Rehabilitation Clinic [Member] \| Germany [Member]
Business Acquisition [Line Items]
Acquisition costs \| €		€ 18,700,000
Term of lease, years		27 years
Lease agreement, end date		2040-11
Number of beds acquired \| Bed		266
Cumulative increases in the German consumer price index		70.00%
2015 [Member] \| RHM Rehabilitation Clinic [Member] \| Germany [Member] \| From 2015 through 2017 [Member]
Business Acquisition [Line Items]
Rent escalations percentage		2.00%
2015 [Member] \| RHM Rehabilitation Clinic [Member] \| Germany [Member] \| After 2017 [Member]
Business Acquisition [Line Items]
Rent escalations percentage		0.50%
2015 [Member] \| General Acute Care Hospital and Healthcare System [Member]
Business Acquisition [Line Items]
Mortgage financing					$ 100,000
Number of licensed hospitals \| Hospital					3
Number of free-standing emergency department and health center \| Hospital					1
Mortgage financing term					5 years
Mortgage financing funded					$ 15,000
2015 [Member] \| General Acute Care Hospital [Member] \| Lake Huron Medical Center [Member]
Business Acquisition [Line Items]
Number of beds acquired \| Bed							144
2015 [Member] \| Rehabilitation Hospital with Covenant Health System [Member] \| Ernest [Member]
Business Acquisition [Line Items]
Number of beds acquired \| Bed								60
2015 [Member] \| Inpatient Rehabilitation Hospital [Member] \| Weslaco Texas [Member] \| Ernest [Member]
Business Acquisition [Line Items]
Acquisition costs										$ 10,700
Term of lease, years										20 years
Number of lease extension options \| RenewalOptions										3
Term of lease extension, years										5 years
Lease agreement, end date										2032-02
Payments to fund long-term loans to related parties										$ 5,000
2015 [Member] \| Median [Member]
Business Acquisition [Line Items]
Acquisition costs \| €									€ 688,000,000
Loans provided for acquisition \| €	€ 240,000,000
Term of lease, years									27 years
Number of properties closed \| Property	31
Number of hospitals acquired \| Hospital	32								32
Lease rent increase percentage									70.00%
Lease agreement, end date									2042-03
Value of properties closed \| €	€ 646,000,000
Loan amount outstanding \| €	€ 0
2015 [Member] \| Capella [Member]
Business Acquisition [Line Items]
Combined purchase price and investment amount													$ 900,000
Ownership interests acquired													49.00%
Acquisition costs				$ 25,800									$ 600,000
Loans provided for acquisition				$ 9,200									$ 290,000
Term of lease, years												15 years
Number of lease extension options \| Leases												4
Term of lease extension, years												5 years
Number of properties closed \| Property												6
Increase in consumer price-index, floor rate												2.00%
Increase in consumer price-index, ceiling rate												4.00%
2015 [Member] \| Capella [Member] \| Acute Care Hospital [Member]
Business Acquisition [Line Items]
Number of portfolio investments \| Investment							7					7	7
Number of investment in form of mortgage loan \| Investment							2					2	2
2015 [Member] \| Capella [Member] \| Joint Venture Partner [Member]
Business Acquisition [Line Items]
Fixed interest rate							8.00%					8.00%
2015 [Member] \| Business Acquisitions [Member]
Business Acquisition [Line Items]
Revenue contributed by the acquired entity																102,700
Income contributed by the acquired entity																87,700
Acquisition related costs																$ 58,000