Real Estate and Lending Activities - Development Activities - Additional Information (Detail) $ in Thousands	Apr. 30, 2015 USD ($) Leases	Sep. 30, 2015 USD ($) Facility Property	May. 05, 2015 USD ($)
Business Acquisition [Line Items]
Estimated total development cost		$ 326,698
Ernest Health, Inc [Member] | Rehabilitation Hospital of Northwest Ohio [Member] | Toledo, OH [Member] | Inpatient Rehabilitation Hospital [Member]
Business Acquisition [Line Items]
Estimated total development cost		$ 19,212	$ 19,212
Adeptus Health [Member]
Business Acquisition [Line Items]
Aggregate commitment amount	$ 250,000
Lease agreement term	15 years
Term of lease extension, years	5 years
Number of lease extension options | Leases	3
Percentage of increase in annual rent	2.00%
Development Activities [Member] | First Choice [Member]
Business Acquisition [Line Items]
Number of property leased | Property		2
Development Activities [Member] | First Choice [Member] | 2015 Master Lease [Member]
Business Acquisition [Line Items]
Number of facilities leased | Facility		13
Development Activities [Member] | First Choice [Member] | 2014 Master Lease [Member]
Business Acquisition [Line Items]
Number of facilities leased | Facility		11