Income Taxes - Unrecognized Tax Benefits (Details) $ in Millions	Mar. 31, 2020 USD ($)
Income Taxes
Amount of refundable alternative minimum tax carryforwards expected to be refunded within the next 12 months	$ 4.4

Amount of refundable alternative minimum tax carryforwards expected to be refunded within the next twelve months due to the Coronavirus Aid, Relief and Economic Security ("CARES") Act.

No definition available.

Name:	wow_AlternativeMinimumTaxCarryforwardExpectedRefundInNextTwelveMonths
Namespace Prefix:	wow_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant