Description of business.

No definition available.

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Namespace Prefix:	cto_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Area of land held.

+ References

No definition available.

+ Details

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

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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

- Definition

Indicates the number of mortgages under each classification.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29.3)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

+ Details

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

- Definition

Number of separate real estate development properties located on land subject to ground leases.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_FinancialInstrumentAxis=cto_FixedRateCommercialMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=cto_AdjustableRateCommercialMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=cto_CommercialRealEstateSingleTenantMember
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- Details

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- Details

Name:	us-gaap_StatementGeographicalAxis=cto_AtlantaGeorgiaMember
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DESCRIPTION OF BUSINESS AND PRINCIPLES OF INTERIM STATEMENTS - Description of Business (Details) ft² in Millions	3 Months Ended
	Mar. 31, 2017 ft² a state loan property	Mar. 31, 2016 a
Description of Business [Line Items]
Number of states in which entity operates \| state	10
Gross leasable space \| ft²	1.8
Number of billboards leased for property \| property	19
Fixed Rate Commercial Mortgage [Member]
Description of Business [Line Items]
Number of mortgage loan investments \| loan	1
Adjustable Rate Commercial Mortgage [Member]
Description of Business [Line Items]
Number of mortgage loan investments \| loan	1
Minimum
Description of Business [Line Items]
Acres \| a	8,200
Commercial
Description of Business [Line Items]
Number of real estate properties \| state	33
Acres \| a		3.1
Single-tenant
Description of Business [Line Items]
Number of real estate properties \| property	22
Multi-tenant
Description of Business [Line Items]
Number of real estate properties \| property	11
Atlanta, GA [Member]
Description of Business [Line Items]
Number of mortgage loan investments \| loan	3