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Note 9 - Fair Value Measurements - Carrying Amounts and Fair Values (Details) $ in Thousands | Mar. 31, 2018 USD ($)
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Reported Value Measurement [Member] | Senior Credit Facilities [Member] |
Long-term debt, including current portion | $ 741,563
Estimate of Fair Value Measurement [Member] | Senior Credit Facilities [Member] |
Long-term debt, including current portion | 741,563
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Notes [Member] |
Long-term debt, including current portion | 450,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Notes [Member] |
Long-term debt, including current portion | 459,000
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member] |
Cash and cash equivalents | 21,508
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] |
Cash and cash equivalents | 21,508
Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] |
Cash and cash equivalents | 144,699
Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] |
Cash and cash equivalents | $ 144,612

X
- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
Name: | us-gaap_CashAndCashEquivalentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByLiabilityClassAxis=cabo_SeniorCreditFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByLiabilityClassAxis=cabo_NotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_CommercialPaperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |