Real Estate and Loans Receivable - Development Activities - Additional Information (Detail) $ in Thousands		12 Months Ended
	Apr. 30, 2015 USD ($) Leases	Dec. 31, 2016 USD ($) Facility	Dec. 31, 2015 USD ($) RenewalOptions Facility Property	Dec. 31, 2014 USD ($) RenewalOptions	Aug. 23, 2016 USD ($)
Business Acquisition [Line Items]
Current development project		$ 162,770
Ernest [Member]
Business Acquisition [Line Items]
Current development project		28,067
Ernest [Member] | Inpatient Rehabilitation Hospital [Member] | Flagstaff Arizona [Member]
Business Acquisition [Line Items]
Current development project					$ 28,100
Ernest [Member] | Rehabilitation Hospital of Northwestern Ohio [Member] | Inpatient Rehabilitation Hospital [Member] | Toledo, OH [Member]
Business Acquisition [Line Items]
Current development project		$ 18,400
Adeptus Health [Member]
Business Acquisition [Line Items]
Term of lease extension, years	5 years
Aggregate commitment amount	$ 250,000
Lease agreement term	15 years
Number of lease extension options | Leases	3
Percentage of increase in annual rent	2.00%
Development Activities [Member] | Acute Care Facilities in Altoona [Member]
Business Acquisition [Line Items]
Number of facilities constructed | Facility		19
Development Activities [Member] | Oakleaf Surgical Hospital [Member] | Acute Care Hospital [Member] | Altoona, WI [Member] | National Surgical Hospitals [Member]
Business Acquisition [Line Items]
Current development project			$ 30,000
Term of lease, years			15 years
Number of lease extension options in current lease contract | RenewalOptions			2
Term of lease extension, years			5 years
Development Activities [Member] | UAB Medical West [Member]
Business Acquisition [Line Items]
Estimated total development cost			$ 8,600
Term of lease, years			15 years
Number of lease extension options in current lease contract | RenewalOptions			4
Term of lease extension, years			5 years
Lease rent increase percentage			2.00%
Development Activities [Member] | Adeptus Health [Member]
Business Acquisition [Line Items]
Aggregate commitment amount		$ 500,000
Number of facilities completed | Facility		54
Number of facilities under construction | Facility		5
Development Activities [Member] | Northern Utah Rehabilitation Hospital [Member]
Business Acquisition [Line Items]
Estimated total development cost		$ 19,000
Development Activities [Member] | First Choice [Member]
Business Acquisition [Line Items]
Number of facilities leased | RenewalOptions				17
Estimated total development cost				$ 83,000
Development Activities [Member] | Acute Care Facilities in Altoona [Member]
Business Acquisition [Line Items]
Number of property leased | Property			3
Development Activities [Member] | Acute Care Facilities in Altoona [Member] | 2015 Master Lease [Member]
Business Acquisition [Line Items]
Number of facilities leased | Facility			17
Estimated total development cost			$ 102,600
Development Activities [Member] | Acute Care Facilities in Altoona [Member] | 2014 Master Lease [Member]
Business Acquisition [Line Items]
Number of facilities leased | Facility			14