Related Party Transactions (Details) - Avista and Crestview, majority unit holders of the Parent of the reporting unit - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Dec. 18, 2015
Related Party Transactions
Quarterly management fees base rate	$ 0.4
Percentage of management fees			50.00%
Payment of management fees	$ 0.0	$ 1.0
Percentage of common shares outstanding held by related party	66.00%

Amount paid to managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP).

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 17
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3367-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of management fees received by related party that is entitled to other related party.

+ References

No definition available.

+ Details

Name:	wow_PercentageOfManagementFees
Namespace Prefix:	wow_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the percentage of outstanding common shares of entity held by related party.

+ References

No definition available.

+ Details

Name:	wow_PercentageOfOutstandingCommonShares
Namespace Prefix:	wow_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The base quarterly management fee for expenses related to the day-to-day business functions, excluding any related travel and miscellaneous expenses.

+ References

No definition available.

+ Details

Name:	wow_QuarterlyManagementFeeBase
Namespace Prefix:	wow_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=wow_AvistaAndCrestviewCapitalPartnersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: