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.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

+ Details

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-13

+ Details

Name:	us-gaap_PaymentsToAcquireRealEstate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The net book value of the asset(s) sold in connection with the sale of the property to another party and lease back to the seller.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 840
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 50
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481266/840-40-55-50

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 840
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 52
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481266/840-40-55-52

Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 840
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 51
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481266/840-40-55-51

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479741/842-40-50-2

+ Details

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

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=wpc_BuildToSuitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstatePropertiesAxis=wpc_RealEstateAssociatedWithSalesLeaseBackMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstatePropertiesAxis=wpc_RealEstateSubjectToOperatingLeaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=wpc_RightOfUseLiabilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=wpc_BlythevilleArkansasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_UseRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=wpc_McDonaldTennesseeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=wpc_VariousUnitedKingdomCzechAndSlovakiaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=wpc_DelphosOhioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=wpc_ExpansionAtFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Finance Receivables - Sale-leaseback (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($) property	Dec. 31, 2024 USD ($) property	Dec. 31, 2023 USD ($) property
Accounts, Notes, Loans and Financing Receivable
Payment to acquire real estate	$ 1,657,339	$ 1,128,809	$ 1,211,397
Build to Suit
Accounts, Notes, Loans and Financing Receivable
Number of properties (property) \| property	9
Real Estate Associated with Sale-leaseback
Accounts, Notes, Loans and Financing Receivable
Number of properties (property) \| property	9
Total Investment	$ 370,043
Real Estate Subject to Operating Leases
Accounts, Notes, Loans and Financing Receivable
Number of properties (property) \| property	173	25	12
Payment to acquire real estate	$ 1,656,317	$ 1,200,000	$ 1,200,000
Real Estate Subject to Operating Leases \| Operating lease liabilities
Accounts, Notes, Loans and Financing Receivable
Payment to acquire real estate	$ 2,296
Blytheville, Arkansas \| Real Estate Associated with Sale-leaseback
Accounts, Notes, Loans and Financing Receivable
Number of properties (property) \| property	1
Total Investment	$ 91,910
Blytheville, Arkansas \| Real Estate Associated with Sale-leaseback \| Land lease right-of-use assets
Accounts, Notes, Loans and Financing Receivable
Payment to acquire real estate	1,500
Blytheville, Arkansas \| Real Estate Subject to Operating Leases \| Operating lease liabilities
Accounts, Notes, Loans and Financing Receivable
Payment to acquire real estate	$ 1,500
McDonald, Tennessee \| Real Estate Associated with Sale-leaseback
Accounts, Notes, Loans and Financing Receivable
Number of properties (property) \| property	1
Total Investment	$ 166,060
Various, United Kingdom, Czech and Slovakia \| Real Estate Associated with Sale-leaseback
Accounts, Notes, Loans and Financing Receivable
Number of properties (property) \| property	6
Total Investment	$ 103,380
Delphos, Ohio \| Build to Suit
Accounts, Notes, Loans and Financing Receivable
Payment to acquire real estate	36,000
Delphos, Ohio \| Expansion at Facility
Accounts, Notes, Loans and Financing Receivable
Payment to acquire real estate	$ 2,000
Delphos, Ohio \| Real Estate Associated with Sale-leaseback
Accounts, Notes, Loans and Financing Receivable
Number of properties (property) \| property	1
Total Investment	$ 8,693