Name:	cabo_LesseeOperatingAndFinanceLeaseRemainingTermOfContract
Namespace Prefix:	cabo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Term of lessee's operating and finance lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

No definition available.

Name:	cabo_LesseeOperatingAndFinanceLeaseRenewalTerm
Namespace Prefix:	cabo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The length of the period of lessor's option to terminate operating and finance leases.

No definition available.

Name:	cabo_LessorOperatingAndFinanceLeasePeriodOfOptionToTerminate
Namespace Prefix:	cabo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Remaining term of lessor's operating and finance leases, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

No definition available.

Name:	cabo_LessorOperatingAndFinanceLeaseRemainingTermOfContract
Namespace Prefix:	cabo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Term of lessor's operating and finance lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

No definition available.

Name:	cabo_LessorOperatingAndFinanceLeaseRenewalTerm
Namespace Prefix:	cabo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Amount of lessee's right to use underlying asset under finance lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

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

Amount of lessee's right to use underlying asset under operating lease.

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

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Name:	us-gaap_BusinessAcquisitionAxis=cabo_ClearwaveMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	srt_RangeAxis=srt_MinimumMember
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