Real Estate and Lending Activities - Schedule of Revenue by Operator (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Investment And Revenue From External Customers [Line Items]
Total Revenue	$ 166,807	$ 126,300	$ 323,204	$ 261,299
Revenue [Member] | Credit Concentration Risk [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue			$ 323,204	$ 261,299
Percentage of Total Revenue			100.00%	100.00%
Revenue [Member] | Credit Concentration Risk [Member] | Prime [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue			$ 63,059	$ 58,859
Percentage of Total Revenue			19.50%	22.50%
Revenue [Member] | Credit Concentration Risk [Member] | Steward [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue			$ 58,278
Percentage of Total Revenue			18.00%
Revenue [Member] | Credit Concentration Risk [Member] | MEDIAN [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue			$ 47,744	$ 47,745
Percentage of Total Revenue			14.80%	18.30%
Revenue [Member] | Credit Concentration Risk [Member] | Ernest [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue			$ 35,269	$ 33,322
Percentage of Total Revenue			10.90%	12.80%
Revenue [Member] | Credit Concentration Risk [Member] | Adeptus Health [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue			$ 26,137	$ 16,205
Percentage of Total Revenue			8.10%	6.20%
Revenue [Member] | Credit Concentration Risk [Member] | RCCH [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue			$ 19,632	$ 32,909
Percentage of Total Revenue			6.10%	12.60%
Revenue [Member] | Credit Concentration Risk [Member] | Other Operators [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue			$ 73,085	$ 72,259
Percentage of Total Revenue			22.60%	27.60%