Real Estate and Lending Activities - 2015 Activity - Additional Information (Detail) (2015 [Member]) In Millions, unless otherwise specified	0 Months Ended		0 Months Ended					0 Months Ended
	Jan. 31, 2015 MEDIAN Transaction [Member] EUR (€)	Jan. 31, 2015 MEDIAN Transaction [Member] EUR (€)	Apr. 30, 2015 Subsequent Event [Member] MEDIAN Transaction [Member] Hospital	Apr. 30, 2015 Subsequent Event [Member] MEDIAN Transaction [Member] Minimum [Member]	Apr. 30, 2015 Subsequent Event [Member] MEDIAN Transaction [Member] Maximum [Member]	Feb. 13, 2015 Acute Care Hospital [Member] Kansas [Member] USD ($) Facility RenewalOptions	Feb. 13, 2015 Acute Care Hospital [Member] Kansas [Member] USD ($) RenewalOptions	Feb. 27, 2015 Inpatient Rehabilitation Hospital [Member] Ernest Health, Inc [Member] Weslaco, Texas [Member] USD ($) Leases
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired						2
Purchase price of acquisition							$ 110
Term of lease, years						10 years
Number of lease extensions options in current lease contract							2
Term of lease extensions, years						5 years		5 years
Mortgage financing						40
Mortgage financing term						10 years
Acquisition costs								10.7
Payments to fund long-term loans to related parties								5
Lease remaining term								17 years
Number of lease extension options								3
Advanced interim acquisition loan	63.1
Interim acquisition loan		€ 425
Number of hospitals purchased and leased			31
Lease expiration period				30 days	60 days