Real Estate and Lending Activities - Capella Transaction - Additional Information (Detail) - Capella [Member] $ in Millions		3 Months Ended	9 Months Ended
Apr. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2016 Hospital
Business Acquisition [Line Items]
Net proceeds from transaction	$ 550.0
Net proceeds from equity investment and loans	492.0
Proceeds from prepayment of mortgage loans	210.0
New loan for hospital property	93.3
Investment on unsecured senior notes	50.0
Transaction costs incurred	$ 6.3
Number of hospital owned \| Hospital			5
Write off of unbilled direct finance lease rent		$ 2.6

Number of hospitals owned.

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Unbilled direct finance lease rent write off.

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Total amount of new mortgage loans on real estate during the reporting period.

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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