General - Additional Information (Detail)	Mar. 31, 2017 Property
5 Unconsolidated Limited Liability Companies | Minimum
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Non-controlling equity interest, ownership percentage	33.00%
5 Unconsolidated Limited Liability Companies | Maximum
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Non-controlling equity interest, ownership percentage	95.00%
Medical office buildings | Limited Liability Companies
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of real estate investments	4