Real Estate and Lending Activities - Schedule of Revenue by Operator (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Investment And Revenue From External Customers [Line Items]
Total Revenue		$ 176,580	$ 126,555	$ 499,784	$ 387,854
Revenue [Member] | Credit Concentration Risk [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue				$ 499,784	$ 387,854
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]			$ 114,776	$ 20,969
Percentage of Total Revenue	[1]			23.00%	5.40%
Revenue [Member] | Credit Concentration Risk [Member] | Prime [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue				$ 94,644	$ 89,389
Percentage of Total Revenue				18.90%	23.10%
Revenue [Member] | Credit Concentration Risk [Member] | MEDIAN [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue				$ 73,793	$ 70,242
Percentage of Total Revenue				14.80%	18.10%
Revenue [Member] | Credit Concentration Risk [Member] | Ernest [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue				$ 53,007	$ 50,564
Percentage of Total Revenue				10.60%	13.00%
Revenue [Member] | Credit Concentration Risk [Member] | Adeptus Health [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue				$ 39,638	$ 25,873
Percentage of Total Revenue				7.90%	6.70%
Revenue [Member] | Credit Concentration Risk [Member] | RCCH [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue				$ 30,668	$ 42,776
Percentage of Total Revenue				6.10%	11.00%
Revenue [Member] | Credit Concentration Risk [Member] | Other Operators [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue				$ 93,258	$ 88,041
Percentage of Total Revenue				18.70%	22.70%

[1] Includes approximately $21.6 million and $21 million of revenue for the nine months ended September 30, 2017 and 2016, respectively, from facilities leased to IASIS prior to it being acquired by Steward on September 29, 2017.