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Separation from Windstream Holdings Inc and Description of Transferred Assets (Details) (Stock Distribution, Subsequent Event, Distribution Systems, Windstream)
 0 Months Ended
Apr. 24, 2015
Stock Distribution | Subsequent Event | Distribution Systems | Windstream
  
Related Party Transaction [Line Items]  
Percentage of stock distributed 80.40%csal_DistributionMadeToLimitedLiabilityCompanyMemberPercentageDistribution
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= us-gaap_StockDistributionMember
/ dei_LegalEntityAxis
= csal_DistributionSystemsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= csal_WindstreamMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember