Investment in Unconsolidated Joint Ventures (AMCO 120 WT Holdings, LLC) (Details) - AMCO 120 WT Holdings, LLC ft² in Thousands, $ in Thousands	Dec. 31, 2019 USD ($) ft² apartment_unit
Schedule of Equity Method Investments [Line Items]
Ownership interest percentage	20.00%
Number of apartment units \| apartment_unit	330
Cash balance of joint venture \| $	$ 49
Office Space
Schedule of Equity Method Investments [Line Items]
Square footage of real estate property (square feet)	33
Retail Space
Schedule of Equity Method Investments [Line Items]
Square footage of real estate property (square feet)	19
AMLI Residential
Schedule of Equity Method Investments [Line Items]
Ownership interest percentage	80.00%

Equity method investments summarized financial information cash.

No definition available.

Name:	cuz_EquityMethodInvestmentsSummarizedFinancialInformationCash
Namespace Prefix:	cuz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of units in a real estate property owned as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfUnitsInRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
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_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=cuz_AMCO120WTHoldingsLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	dei_LegalEntityAxis=cuz_AMLIResidentialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: