Real Estate and Loans Receivable - Assets Acquired (Parenthetical) (Detail) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Loans repaid	[1]		$ 259,378
Steward Health Care System LLC [Member]
Business Acquisition [Line Items]
Loans repaid		$ 259,400
Intangible Lease Assets - Subject to Amortization [Member]
Business Acquisition [Line Items]
Weighted average useful life of acquired intangible lease assets (in years)		18 years 6 months	20 years

[1] Includes $259.4 million of loans advanced to Steward Health Care System LLC (“Steward”) in 2017 and repaid in 2018 as described more fully below.