Description of Business and Basis of Presentation (Description of Business) (Details) ft² in Thousands	3 Months Ended
Mar. 31, 2020 ft²
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Distribution of taxable income to qualify as REIT, percentage	100.00%
Interests in portfolio of real estate assets	19,000
Portfolio of real estate assets (sqft)	310
CPLP
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Percentage of partnership units owned by the Company (more than)	99.00%

Company's portfolio of real estate assets - Total square footage of office portfolio.

No definition available.

Name:	cuz_CompanysPortfolioOfRealEstateAssetsConsistOfficeSpace
Namespace Prefix:	cuz_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Company's portfolio of real estate assets - Total square footage of retail portfolio.

+ References

No definition available.

+ Details

Name:	cuz_CompanysPortfolioOfRealEstateAssetsConsistRetailSpace
Namespace Prefix:	cuz_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of taxable income that must be distributed annually to qualify as a REIT.

+ References

No definition available.

+ Details

Name:	cuz_DistributionofTaxableIncometoQualifyasREITMinimum
Namespace Prefix:	cuz_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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

- Definition

Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

+ Details

Name:	us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_OwnershipAxis=cuz_CousinsPropertiesLPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: