Limited Liability Companies Accounted for Under Equity Method (Detail) - Equity Method Investments	12 Months Ended
	Dec. 31, 2017
Suburban Properties
Schedule Of Equity Method Investments [Line Items]
Ownership	33.00%
Property Owned by LLC	St. Matthews Medical Plaza II
Brunswick Associates
Schedule Of Equity Method Investments [Line Items]
Ownership	74.00%	[1],[2]
Property Owned by LLC	Mid Coast Hospital MOB	[1],[2]
Grayson Properties
Schedule Of Equity Method Investments [Line Items]
Ownership	95.00%	[3],[4]
Property Owned by LLC	Texoma Medical Plaza	[3],[4]
FTX MOB Phase II limited partnership
Schedule Of Equity Method Investments [Line Items]
Ownership	95.00%	[5]
Property Owned by LLC	Forney Medical Plaza II	[5]

[1] At December 31, 2017, we are the lessee with a third party on a ground lease for land.

[2] This LLC has a third-party term loan of $8.4 million, which is non-recourse to us, outstanding as of December 31, 2017.

[3] At December 31, 2017, we are the lessee with a UHS-related party on a ground lease for land.

[4] This building is on the campus of a UHS hospital and has tenants that include subsidiaries of UHS. This LP has a third-party term loan of $14.2 million, which is non-recourse to us, outstanding as of December 31, 2017.

[5] We have committed to invest up to $2.5 million in equity and debt financing, of which $2.1 million has been funded as of December 31, 2017. This LP has a third-party term loan of $5.2 million, which is non-recourse to us, outstanding as of December 31, 2017.