Limited Liability Companies Accounted for Under Equity Method (Parenthetical) (Detail)	3 Months Ended
	Mar. 31, 2016 USD ($)
Brunswick Associates
Schedule Of Equity Method Investments [Line Items]
Third-party term loan	$ 8,700,000
Arlington Medical Properties
Schedule Of Equity Method Investments [Line Items]
Committed investment in equity and debt financing, funded	5,200,000
Commitment to investment	623,000
Proceeds from Lines of Credit	$ 22,800,000
Percentage of minority ownership purchased from third-party members	10.00%
Business acquisition additional consideration	$ 4,800,000
Cash payment made purchased addition of ownership interest	85.00%
Grayson Properties
Schedule Of Equity Method Investments [Line Items]
Third-party term loan	$ 14,600,000
Committed investment in equity and debt financing, funded	2,800,000
Commitment to investment	100,000
FTX MOB Phase II limited partnership
Schedule Of Equity Method Investments [Line Items]
Third-party term loan	5,400,000
Committed investment in equity and debt financing, funded	2,000,000
Commitment to investment	$ 2,500,000