Business - Joint Venture Transactions (Details) $ in Millions		9 Months Ended
Nov. 01, 2017 USD ($) property agreement	Sep. 30, 2017
RIDEA I
Variable Interest Entity [Line Items]
Ownership percentage (as a percent)		90.00%
RIDEA III
Variable Interest Entity [Line Items]
Ownership percentage (as a percent)		90.00%
CCRC JV \| SHOP
Variable Interest Entity [Line Items]
Investment ownership percentage		49.00%
Master Lease Transactions \| Affiliated Entity \| Subsequent Event \| RIDEA I
Variable Interest Entity [Line Items]
Percentage of interest acquired	10.00%
Master Lease Transactions \| Affiliated Entity \| Subsequent Event \| RIDEA III
Variable Interest Entity [Line Items]
Percentage of interest acquired	10.00%
Master Lease Transactions \| Affiliated Entity \| Assets Leased to Others \| RIDEA Facilities \| Subsequent Event
Variable Interest Entity [Line Items]
Number of properties	58
Number of assets under management agreement	2
Master Lease Transactions \| Affiliated Entity \| SHOP \| Assets Leased to Others \| RIDEA Facilities \| Subsequent Event
Variable Interest Entity [Line Items]
Number of properties	36
Base management fee, percentage of gross revenue	5.00%
Percentage of annual increase in management fee	1.00%
Management fee annual rent increase period	2 years
Number of assets to be sold	4
Total consideration for disposition of real estate \| $	$ 239
Number of assets under management agreement	18
Number of management agreement with termination rights \| agreement	7
Management agreements with termination rights period	10 years
Master Lease Transactions \| Affiliated Entity \| Maximum \| SHOP \| Assets Leased to Others \| RIDEA Facilities \| Subsequent Event
Variable Interest Entity [Line Items]
Base management fee, percentage of gross revenue	7.00%
Master Lease Transactions \| Affiliated Entity \| CCRC JV \| SHOP
Variable Interest Entity [Line Items]
Investment ownership percentage		49.00%
Ownership interest held by Parent		51.00%

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Number Of Properties To Be Sold

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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The percentage charged for managing real estate properties.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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-Publisher FASB
-Name Accounting Standards Codification
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