DIRECT FINANCING LEASES (Schedule of Components of Investment in Direct Financing Leases) (Detail) $ in Thousands	Dec. 31, 2019 USD ($) lease facility	Dec. 31, 2018 USD ($) lease facility
Lessee, Lease, Description [Line Items]
Minimum lease payments receivable	$ 27,227	$ 28,294
Less unearned income	(15,522)	(16,577)
Investment in direct financing leases	11,705
Investment in direct financing leases - net	$ 11,488	$ 132,262
Number of real estate properties \| facility	987
Number of direct financing leases \| lease	2	3
Orianna
Lessee, Lease, Description [Line Items]
Investment in direct financing leases		$ 223,745
Less allowance for loss on direct financing leases		(103,200)
Non-Orianna
Lessee, Lease, Description [Line Items]
Investment in direct financing leases	$ 11,705	$ 11,717
Less allowance for loss on direct financing leases	$ (217)
Facilities Subject to Direct Financing Leases [Member]
Lessee, Lease, Description [Line Items]
Number of real estate properties \| facility	2	17

Direct financing lease lease receivable allowance for loss.

No definition available.

Name:	ohi_DirectFinancingLeaseLeaseReceivableAllowanceForLoss
Namespace Prefix:	ohi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Direct financing lease lease receivable including allowance for loss.

+ References

No definition available.

+ Details

Name:	ohi_DirectFinancingLeaseLeaseReceivableIncludingAllowanceForLoss
Namespace Prefix:	ohi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents number of direct financing leases.

+ References

No definition available.

+ Details

Name:	ohi_NumberOfDirectFinancingLeases
Namespace Prefix:	ohi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of deferred selling profit from direct financing lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919379-209981

+ Details

Name:	us-gaap_DirectFinancingLeaseDeferredSellingProfit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Present value of lease payments not yet received by lessor and amount expected to be derived from underlying asset, following end of lease term, guaranteed by lessee or other third party unrelated to lessor, from direct financing lease.

+ References

+ Details

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

- Definition

Amount of net investment in direct financing lease.

+ References

+ Details

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

- Definition

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.

+ References

No definition available.

+ Details

Name:	us-gaap_LesseeLeaseDescriptionLineItems
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

- Details

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- Details

Name:	dei_LegalEntityAxis=ohi_NonOriannaEntitiesMember
Namespace Prefix:
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- Details

Name:	ohi_PropertyCategoryAxis=ohi_FacilitiesSubjectToDirectFinancingLeasesMember
Namespace Prefix:
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