Real Estate and Lending Activities - Schedule of Revenue by Operator (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Investment And Revenue From External Customers [Line Items]
Total Revenue		$ 205,046	$ 156,397
Revenue [Member] | Credit Concentration Risk [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue		$ 205,046	$ 156,397
Percentage of Total Revenue		100.00%	100.00%
Revenue [Member] | Prime [Member] | Credit Concentration Risk [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue		$ 31,778	$ 31,511
Percentage of Total Revenue		15.50%	20.10%
Revenue [Member] | Steward [Member] | Credit Concentration Risk [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue	[1]	$ 73,227	$ 33,704
Percentage of Total Revenue	[1]	35.70%	21.60%
Revenue [Member] | MEDIAN [Member] | Credit Concentration Risk [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue		$ 29,088	$ 23,450
Percentage of Total Revenue		14.20%	15.00%
Revenue [Member] | Ernest [Member] | Credit Concentration Risk [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue		$ 16,416	$ 17,520
Percentage of Total Revenue		8.00%	11.20%
Revenue [Member] | RCCH [Member] | Credit Concentration Risk [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue		$ 9,537	$ 9,306
Percentage of Total Revenue		4.70%	6.00%
Revenue [Member] | Other Operators [Member] | Credit Concentration Risk [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue		$ 45,000	$ 40,906
Percentage of Total Revenue		21.90%	26.10%

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