Summary of Significant Accounting Policies - Provision for Doubtful Accounts (Details)	12 Months Ended
Dec. 31, 2020
Bad Debt
Period of delinquency after which Company disconnects services to customers	60 days

Represents the period of delinquency after which the entity disconnect services to customers.

No definition available.

Name:	wow_DelinquencyPeriodAfterWhichEntityDisconnectsServicesToCustomer
Namespace Prefix:	wow_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration