Summarized Financial Information of Equity Affiliates - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2016 Property
Limited Liability Companies | Medical office buildings
Schedule Of Equity Method Investments [Line Items]
Number of real estate investments	5
Minimum
Schedule Of Equity Method Investments [Line Items]
Number of days for Non-Offering Member either to purchase or sell its entire ownership interest to or from Offering Member	60 days
Maximum
Schedule Of Equity Method Investments [Line Items]
Number of days for Non-Offering Member either to purchase or sell its entire ownership interest to or from Offering Member	90 days
5 Unconsolidated Limited Liability Companies / Limited Partner | Minimum
Schedule Of Equity Method Investments [Line Items]
Non-controlling equity interest, ownership percentage	33.00%
5 Unconsolidated Limited Liability Companies / Limited Partner | Maximum
Schedule Of Equity Method Investments [Line Items]
Non-controlling equity interest, ownership percentage	95.00%
Arlington Medical Properties
Schedule Of Equity Method Investments [Line Items]
Non-controlling equity interest, ownership percentage	85.00%
Percentage of minority ownership purchased from third-party members	10.00%