XML 54 R43.htm IDEA: XBRL DOCUMENT
v3.25.1

Geographic and segment information: (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 USD ($) segment | Mar. 31, 2024 USD ($) | Dec. 31, 2024 USD ($)
Geographic and segment information: |  |  |
Number of operating segments | segment | 1 |  |
Revenues | $ 247,048 | $ 266,168 |
Long lived assets, net | 2,227,252 |  | $ 1,738,349
On-net IP |  |  |
Geographic and segment information: |  |  |
Revenues | 129,628 | 138,624 |
Off-net IP |  |  |
Geographic and segment information: |  |  |
Revenues | 107,274 | 118,178 |
Wavelength |  |  |
Geographic and segment information: |  |  |
Revenues | 7,119 | 3,327 |
Non-core |  |  |
Geographic and segment information: |  |  |
Revenues | 3,027 | 6,039 |
North America |  |  |
Geographic and segment information: |  |  |
Revenues | 209,930 | 228,919 |
Long lived assets, net | 2,058,310 |  | 1,579,495
North America | On-net IP |  |  |
Geographic and segment information: |  |  |
Revenues | 99,080 | 108,694 |
North America | Off-net IP |  |  |
Geographic and segment information: |  |  |
Revenues | 101,020 | 111,019 |
North America | Wavelength |  |  |
Geographic and segment information: |  |  |
Revenues | 6,891 | 3,327 |
North America | Non-core |  |  |
Geographic and segment information: |  |  |
Revenues | 2,939 | 5,879 |
Europe |  |  |
Geographic and segment information: |  |  |
Revenues | 28,999 | 29,101 |
Europe | On-net IP |  |  |
Geographic and segment information: |  |  |
Revenues | 23,769 | 23,641 |
Europe | Off-net IP |  |  |
Geographic and segment information: |  |  |
Revenues | 4,962 | 5,339 |
Europe | Wavelength |  |  |
Geographic and segment information: |  |  |
Revenues | 216 |  |
Europe | Non-core |  |  |
Geographic and segment information: |  |  |
Revenues | 52 | 121 |
South America |  |  |
Geographic and segment information: |  |  |
Revenues | 1,979 | 1,992 |
South America | On-net IP |  |  |
Geographic and segment information: |  |  |
Revenues | 1,763 | 1,748 |
South America | Off-net IP |  |  |
Geographic and segment information: |  |  |
Revenues | 208 | 235 |
South America | Non-core |  |  |
Geographic and segment information: |  |  |
Revenues | 8 | 9 |
Oceania |  |  |
Geographic and segment information: |  |  |
Revenues | 6,002 | 5,971 |
Oceania | On-net IP |  |  |
Geographic and segment information: |  |  |
Revenues | 4,904 | 4,380 |
Oceania | Off-net IP |  |  |
Geographic and segment information: |  |  |
Revenues | 1,058 | 1,561 |
Oceania | Wavelength |  |  |
Geographic and segment information: |  |  |
Revenues | 12 |  |
Oceania | Non-core |  |  |
Geographic and segment information: |  |  |
Revenues | 28 | 30 |
Africa |  |  |
Geographic and segment information: |  |  |
Revenues | 138 | 185 |
Africa | On-net IP |  |  |
Geographic and segment information: |  |  |
Revenues | 112 | 161 |
Africa | Off-net IP |  |  |
Geographic and segment information: |  |  |
Revenues | 26 | $ 24 |
Europe and other |  |  |
Geographic and segment information: |  |  |
Long lived assets, net | $ 168,942 |  | $ 158,854

X
- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-41 + Details
Name: | us-gaap_NoncurrentAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-18 + Details
Name: | us-gaap_NumberOfOperatingSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 924 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479941/924-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-30 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-40 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-41 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-4 + Details
Name: | us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_ProductOrServiceAxis=ccoi_OnNetInternetProtocolMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=ccoi_OffNetInternetProtocolMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=ccoi_WavelengthServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=ccoi_NonCoreServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=srt_NorthAmericaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=srt_EuropeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=srt_SouthAmericaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=ccoi_OceaniaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=srt_AfricaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=ccoi_EuropeAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |