Real Estate, net and Real Estate Held for Sale - Summary of Assets And Liabilities Held for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets
Real estate, net	$ 620,403	$ 178,564
Deferred leasing costs and intangible assets, net	23,972	5,890
Total assets held for sale	644,375	184,454
Liabilities
Intangible liabilities, net	12,131	294
Total liabilities related to assets held for sale	$ 12,131	$ 294

Finite-Lived Intangible Assets And Deferred Leasing Costs, Held-for-sale

No definition available.

Name:	clnc_FiniteLivedIntangibleAssetsAndDeferredLeasingCostsHeldforsale
Namespace Prefix:	clnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Finite-Lived Intangible Assets And Deferred Leasing Costs, Liabilities Related to Assets Held-for-sale, Not Part of Disposal Group

+ References

No definition available.

+ Details

Name:	clnc_FiniteLivedIntangibleAssetsAndDeferredLeasingCostsLiabilitiesRelatedtoAssetsHeldforsaleNotPartofDisposalGroup
Namespace Prefix:	clnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Liabilities Related to Assets Held for Sale, Not Part of Disposal Group

+ References

No definition available.

+ Details

Name:	clnc_LiabilitiesRelatedtoAssetsHeldforSaleNotPartofDisposalGroup
Namespace Prefix:	clnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Liabilities Related to Assets Held-for-sale, Not Part of Disposal Group [Abstract]

+ References

No definition available.

+ Details

Name:	clnc_LiabilitiesRelatedtoAssetsHeldforsaleNotPartofDisposalGroupAbstract
Namespace Prefix:	clnc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Real Estate Held-for-sale, Not Part of Disposal Group

+ References

No definition available.

+ Details

Name:	clnc_RealEstateHeldforsaleNotPartofDisposalGroup
Namespace Prefix:	clnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

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

- Definition

Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(f))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

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