Amount of principal due on delinquent mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, acquired from controlled and other affiliates.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Footnote 10(b)
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Footnote 10(b)))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

+ Details

Name:	srt_MortgageLoansOnRealEstateDelinquentPrincipalOrInterestAcquiredFromAffiliates
Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of contractual principal due at origination of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Paragraph Column F
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column F))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

+ Details

Name:	srt_MortgageLoansOnRealEstateFaceAmountOfMortgages
Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Interest rate of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Paragraph Column B
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column B))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

+ Details

Name:	srt_MortgageLoansOnRealEstateInterestRate
Namespace Prefix:	srt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of prior lien on real estate securing mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Paragraph Column E
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column E))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

+ Details

Name:	srt_MortgageLoansOnRealEstatePriorLiens1
Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column G))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

+ Details

Name:	us-gaap_MortgageLoansOnRealEstate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Mortgage Loans on Real Estate.

+ References

No definition available.

+ Details

Name:	well_MortgageLoanOnRealEstateAbstract
Namespace Prefix:	well_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The monthly periodic payment amount paid against the mortgage loans on real estate.

+ References

No definition available.

+ Details

Name:	well_MortgageLoansOnRealEstatePeriodicPaymentAmount
Namespace Prefix:	well_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis=us-gaap_FirstMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=well_TripleNetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	well_MortgageLoansOnRealEstateLocationDescriptionAxis=well_California1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	well_MortgageLoansOnRealEstateLocationDescriptionAxis=well_California2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	well_MortgageLoansOnRealEstateLocationDescriptionAxis=well_UnitedKingdom1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	well_MortgageLoansOnRealEstateLocationDescriptionAxis=well_UnitedKingdom2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	well_MortgageLoansOnRealEstateLocationDescriptionAxis=well_UnitedKingdom3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	well_MortgageLoansOnRealEstateLocationDescriptionAxis=well_UnitedKingdom5Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=well_OutpatientMedicalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	well_MortgageLoansOnRealEstateLocationDescriptionAxis=well_UnitedKingdom4Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Schedule IV - Mortgage Loans on Real Estate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Mortgage Loans on Real Estate
Prior Liens	$ 0
Face Amount of Mortgages	248,861
Carrying Amount of Mortgages	145,686	$ 249,071	$ 306,120	$ 485,735
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
First Mortgage Loans \| Triple-net \| California
Mortgage Loans on Real Estate
Interest Rate	7.95%
Monthly Payment Terms, Periodic Payment Amount	$ 696
Prior Liens	0
Face Amount of Mortgages	131,100
Carrying Amount of Mortgages	53,071
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
First Mortgage Loans \| Triple-net \| United Kingdom
Mortgage Loans on Real Estate
Interest Rate	7.25%
Monthly Payment Terms, Periodic Payment Amount	$ 139
Prior Liens	0
Face Amount of Mortgages	27,828
Carrying Amount of Mortgages	23,788
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
First Mortgage Loans \| Triple-net \| United Kingdom
Mortgage Loans on Real Estate
Interest Rate	8.53%
Monthly Payment Terms, Periodic Payment Amount	$ 140
Prior Liens	0
Face Amount of Mortgages	19,904
Carrying Amount of Mortgages	19,904
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
First Mortgage Loans \| Triple-net \| Pennsylvania
Mortgage Loans on Real Estate
Interest Rate	8.72%
Monthly Payment Terms, Periodic Payment Amount	$ 108
Prior Liens	0
Face Amount of Mortgages	15,530
Carrying Amount of Mortgages	15,108
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
First Mortgage Loans \| Triple-net \| North Carolina
Mortgage Loans on Real Estate
Interest Rate	7.83%
Monthly Payment Terms, Periodic Payment Amount	$ 92
Prior Liens	0
Face Amount of Mortgages	30,883
Carrying Amount of Mortgages	16,259
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
First Mortgage Loans \| Triple-net \| United Kingdom
Mortgage Loans on Real Estate
Interest Rate	8.50%
Monthly Payment Terms, Periodic Payment Amount	$ 92
Prior Liens	0
Face Amount of Mortgages	19,876
Carrying Amount of Mortgages	13,823
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
First Mortgage Loans \| Outpatient Medical \| Texas
Mortgage Loans on Real Estate
Interest Rate	7.86%
Monthly Payment Terms, Periodic Payment Amount	$ 24
Prior Liens	0
Face Amount of Mortgages	3,740
Carrying Amount of Mortgages	3,733
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0