Organization and Basis of Presentation - Markets and segments (Details)	12 Months Ended
Dec. 31, 2020 item
Organization and Basis of Presentation
Number of markets	19

Represents the number of markets in which services are provided by the entity.

No definition available.

Name:	wow_NumberOfMarketsInWhichServicesAreProvided
Namespace Prefix:	wow_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration