Schedule IV - Schedule of Mortgage Loans on Real Estate (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	1,274,995,000
Carrying Amount of Mortgages	1,274,995,000	$ 1,213,283,000	$ 1,778,264,000	$ 1,060,336,000
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Long-Term First Mortgage Loan [Member]
Mortgage Loans on Real Estate [Line Items]
Periodic Payment Terms	Payable in monthly installments of interest plus principal payable in full at maturity
Long-Term First Mortgage Loan [Member] | Desert Valley Hospital [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	11.00%
Final Maturity Date	2022
Face Amount of Mortgages	$ 70,000,000
Carrying Amount of Mortgages	70,000,000
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Long-Term First Mortgage Loan [Member] | Desert Valley Hospital [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	12.40%
Final Maturity Date	2022
Face Amount of Mortgages	$ 20,000,000
Carrying Amount of Mortgages	20,000,000
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Long-Term First Mortgage Loan [Member] | Desert Valley Hospital [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	11.00%
Final Maturity Date	2021
Face Amount of Mortgages	$ 12,500,000
Carrying Amount of Mortgages	12,500,000
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Long-Term First Mortgage Loan [Member] | Chino Valley Medical Center [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	11.00%
Final Maturity Date	2022
Face Amount of Mortgages	$ 50,000,000
Carrying Amount of Mortgages	50,000,000
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Long-Term First Mortgage Loan [Member] | Paradise Valley Hospital [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	11.20%
Final Maturity Date	2022
Face Amount of Mortgages	$ 25,000,000
Carrying Amount of Mortgages	25,000,000
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Long-Term First Mortgage Loan [Member] | Ernest [member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	10.20%
Final Maturity Date	2032
Face Amount of Mortgages	$ 115,000,000
Carrying Amount of Mortgages	115,000,000
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Long-Term First Mortgage Loan [Member] | Centinela Hospital Medical Center [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	11.90%
Final Maturity Date	2022
Face Amount of Mortgages	$ 100,000,000
Carrying Amount of Mortgages	100,000,000
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Long-Term First Mortgage Loan [Member] | Olympia Medical Center [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	10.90%
Final Maturity Date	2024
Face Amount of Mortgages	$ 25,000,000
Carrying Amount of Mortgages	25,000,000
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Long-Term First Mortgage Loan [Member] | St. Joseph Medical Center [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	9.30%
Final Maturity Date	2025
Face Amount of Mortgages	$ 30,000,000
Carrying Amount of Mortgages	30,000,000
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Long-Term First Mortgage Loan [Member] | St. Mary's Medical Center [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	9.30%
Final Maturity Date	2025
Face Amount of Mortgages	$ 10,000,000
Carrying Amount of Mortgages	10,000,000
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Long-Term First Mortgage Loan [Member] | Lake Huron Medical Center [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	9.30%
Final Maturity Date	2025
Face Amount of Mortgages	$ 10,000,000
Carrying Amount of Mortgages	10,000,000
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Long-Term First Mortgage Loan [Member] | Steward [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	7.80%
Final Maturity Date	2031
Face Amount of Mortgages	$ 737,242,000
Carrying Amount of Mortgages	737,242,000
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Long-Term First Mortgage Loan [Member] | Vibra [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	11.50%
Final Maturity Date	2024
Face Amount of Mortgages	$ 18,986,000
Carrying Amount of Mortgages	18,986,000
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Long-Term First Mortgage Loan [Member] | Prospect [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	7.50%
Final Maturity Date	2034
Face Amount of Mortgages	$ 51,267,000
Carrying Amount of Mortgages	51,267,000
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0