Real Estate and Loans Receivable - Adeptus Health - Additional Information (Detail) $ in Millions					12 Months Ended
	Dec. 07, 2017 USD ($) Leases	Oct. 18, 2017 RenewalOptions	Sep. 29, 2017 USD ($) Facility	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2015 RenewalOptions	Apr. 04, 2017 USD ($)
Business Acquisition [Line Items]
Gain offset by non-cash charges				$ 0.6
Louisiana [Member] | Ochsner [Member]
Business Acquisition [Line Items]
Total budgeted investment							$ 24.5
Term of lease, years		15 years
Number of lease extension options | RenewalOptions		3
Term of lease extension, years		5 years
Average minimum lease rate on development and construction cost		9.20%
Gain offset by non-cash charges					$ 0.5
Colorado [Member] | University of Colorado Hospital [Member]
Business Acquisition [Line Items]
Number of leased properties | Leases	11
Total budgeted investment	$ 58.6
Term of lease, years	15 years
Number of lease extension options | Leases	3
Term of lease extension, years	5 years
Lease rent increase percentage	2.00%
Adeptus Health [Member]
Business Acquisition [Line Items]
Date plan of reorganization confirmed			Sep. 29, 2017
Date plan of reorganization confirmed effective			Oct. 02, 2017
Number of facilities expected to sell re-lease or sell | Facility			16
Number of leased properties | Facility			56
Amortization of straight line rent receivable			$ 4.2
Number of lease extension options | RenewalOptions						3
Term of lease extension, years						5 years
Lease rent increase percentage						2.00%