Goodwill, Deferred Leasing Costs and Other Intangibles - Future Amortization Expense (Details) $ in Thousands	Jun. 30, 2020 USD ($)
Net increase (decrease) to rental income
Remaining 2020	$ 2,867
2021	6,444
2022	6,077
2023	6,803
2024	(5,634)
2025 and Thereafter	(10,478)
Total	6,079
Amortization expense
Remaining 2020	48,499
2021	80,318
2022	62,220
2023	51,208
2024	47,109
2025 and Thereafter	152,785
Total	$ 442,139

Amortization of Above and Below Market Leases [Abstract]

No definition available.

Name:	clny_AmortizationofAboveandBelowMarketLeasesAbstract
Namespace Prefix:	clny_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amortization of Above and Below Market Leases, After Year Four

+ References

No definition available.

+ Details

Name:	clny_AmortizationofAboveandBelowMarketLeasesAfterYearFour
Namespace Prefix:	clny_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amortization of Above and Below Market Leases, Remainder of Fiscal Year

+ References

No definition available.

+ Details

Name:	clny_AmortizationofAboveandBelowMarketLeasesRemainderofFiscalYear
Namespace Prefix:	clny_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amortization of Above and Below Market Leases, Total

+ References

No definition available.

+ Details

Name:	clny_AmortizationofAboveandBelowMarketLeasesTotal
Namespace Prefix:	clny_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amortization of Above and Below Market Leases, Year Four

+ References

No definition available.

+ Details

Name:	clny_AmortizationofAboveandBelowMarketLeasesYearFour
Namespace Prefix:	clny_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amortization of Above and Below Market Leases, Year One [Member]

+ References

No definition available.

+ Details

Name:	clny_AmortizationofAboveandBelowMarketLeasesYearOne
Namespace Prefix:	clny_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amortization of Above and Below Market Leases, Year Three

+ References

No definition available.

+ Details

Name:	clny_AmortizationofAboveandBelowMarketLeasesYearThree
Namespace Prefix:	clny_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amortization of Above and Below Market Leases, Year Two

+ References

No definition available.

+ Details

Name:	clny_AmortizationofAboveandBelowMarketLeasesYearTwo
Namespace Prefix:	clny_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Finite-Lived Intangible Asset, Expected Amortization, After Year Four

+ References

No definition available.

+ Details

Name:	clny_FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour
Namespace Prefix:	clny_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Finite-Lived Intangible Assets, Amortization

+ References

No definition available.

+ Details

Name:	clny_FiniteLivedIntangibleAssetsAmortization
Namespace Prefix:	clny_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

+ Details

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

- Definition

Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in remainder of current fiscal year.

+ References

No definition available.

+ Details

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

- Definition

Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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

- Definition

Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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

- Definition

Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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

- References

No definition available.

+ Details

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