Real Estate and Lending Activities - Schedule of Revenue by Operator (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Investment And Revenue From External Customers [Line Items]
Total Revenue	$ 126,555	$ 114,570	$ 387,854	$ 310,333
Revenue [Member] | Credit Concentration Risk [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue			$ 387,854	$ 310,333
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			$ 89,389	$ 75,982
Percentage of Total Revenue			23.10%	24.50%
Revenue [Member] | Credit Concentration Risk [Member] | Median [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue			$ 70,242	$ 56,609
Percentage of Total Revenue			18.10%	18.20%
Revenue [Member] | Credit Concentration Risk [Member] | Ernest [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue			$ 50,564	$ 45,874
Percentage of Total Revenue			13.00%	14.80%
Revenue [Member] | Credit Concentration Risk [Member] | RCCH [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue			$ 42,776	$ 7,155
Percentage of Total Revenue			11.00%	2.30%
Revenue [Member] | Credit Concentration Risk [Member] | Adeptus Health [Member]
Investment And Revenue From External Customers [Line Items]
Total Revenue			$ 25,873	$ 12,982
Percentage of Total Revenue			6.70%	4.20%