Real Estate and Loans Receivable - Schedule of Revenue by Operator (Detail) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investment And Revenue From External Customers [Line Items]
Total Revenue		$ 204,961	$ 176,580	$ 166,807	$ 156,397	$ 153,283	$ 126,555	$ 126,300	$ 134,999	$ 704,745	$ 541,137	$ 441,878
Revenue [Member] | Credit Concentration Risk [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue										$ 704,745	$ 541,137
Percentage of Total Revenue										100.00%	100.00%
Revenue [Member] | Credit Concentration Risk [Member] | Steward [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue	[1]									$ 190,172	$ 54,068
Percentage of Total Revenue	[1]									27.00%	10.00%
Revenue [Member] | Credit Concentration Risk [Member] | Prime [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue										$ 126,269	$ 120,558
Percentage of Total Revenue										17.90%	22.30%
Revenue [Member] | Credit Concentration Risk [Member] | Median [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue										$ 100,531	$ 93,425
Percentage of Total Revenue										14.30%	17.30%
Revenue [Member] | Credit Concentration Risk [Member] | Ernest [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue										$ 70,665	$ 67,742
Percentage of Total Revenue										10.00%	12.50%
Revenue [Member] | Credit Concentration Risk [Member] | RCCH [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue										$ 41,890	$ 52,720
Percentage of Total Revenue										5.90%	9.70%
Revenue [Member] | Credit Concentration Risk [Member] | Other Operators [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue										$ 175,218	$ 152,624
Percentage of Total Revenue										24.90%	28.20%

[1] Includes revenue from IASIS prior to being acquired by Steward on September 29, 2017.