| Component: (Network and Table) | |
|---|---|
| Network | 40406 - Disclosure - Long-term debt: Long-term debt maturities (Details) (http://www.cogentco.com/role/DisclosureLongTermDebtLongTermDebtMaturitiesDetails) |
| Table | (Implied) |
| Reporting Entity [Axis] | 0001158324 (http://www.sec.gov/CIK) |
| Long-term debt: | Period [Axis] |
|---|---|
2016-12-31 | |
Long-term debt: | |
Long-term debt maturities | |
2017 | |
2018 | |
2021 | |
Thereafter | |
Total |