Real Estate Transactions - MOB JV (Details) - Forecast - MOB JV $ in Millions	3 Months Ended
Sep. 30, 2018 USD ($) property
Real Estate [Line Items]
Number of properties contributed to joint venture \| property	9
Value of contributed properties \| $	$ 320
Lease term	10 years
Percentage of rentable area leased	94.00%

Value of property contributed in noncash investing and financing activities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration