Real Estate Activities - Assets Acquired (Parenthetical) (Detail) $ in Thousands		12 Months Ended
		Dec. 31, 2018 USD ($)	Dec. 31, 2017 Hospital	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Weighted average useful life of acquired intangible lease assets (in years)		26 years
Loans repaid	[1]	$ 764,447		$ 193,262
Number of sale leaseback conversion properties | Hospital			4
Steward [Member]
Business Acquisition [Line Items]
Loans repaid		$ 800,000
Capella [Member]
Business Acquisition [Line Items]
Loans repaid				93,300
Prime Healthcare Services, Inc [Member]
Business Acquisition [Line Items]
Loans repaid				$ 100,000
Intangible Lease Assets - Subject to Amortization [Member]
Business Acquisition [Line Items]
Weighted average useful life of acquired intangible lease assets (in years)		27 years 10 months 24 days	27 years 8 months 12 days	28 years 6 months

[1] The 2018 column includes $0.8 billion of loans advanced to Steward in 2016 and repaid in 2018 as part of sale leaseback conversion described below. The 2016 column includes $93.3 million of loans advanced to Capella(2) in 2015 and repaid in 2016 as a part of the Capella transaction (2), along with $100.0 million of loans advanced to Prime Healthcare Services, Inc. (“Prime”) in 2015 and repaid in 2016 as part of the sale leaseback conversion of four properties in New Jersey.