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Customer List Intangible Assets - Schedule of Estimated Amortization Expense (Details) (Consumer CLEC Business, USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Finite Lived Intangible Assets [Line Items]      
Net Carrying Value $ 13,438us-gaap_FiniteLivedIntangibleAssetsNet $ 14,452us-gaap_FiniteLivedIntangibleAssetsNet  
Scenario, Forecast
     
Finite Lived Intangible Assets [Line Items]      
2016     3,258us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ dei_LegalEntityAxis
= csal_ConsumerCLECBusinessMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
2017     2,607us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ dei_LegalEntityAxis
= csal_ConsumerCLECBusinessMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
2018     1,994us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ dei_LegalEntityAxis
= csal_ConsumerCLECBusinessMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
2019     1,384us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ dei_LegalEntityAxis
= csal_ConsumerCLECBusinessMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
2020     870us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ dei_LegalEntityAxis
= csal_ConsumerCLECBusinessMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
Thereafter     416us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
/ dei_LegalEntityAxis
= csal_ConsumerCLECBusinessMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
Net Carrying Value     $ 10,529us-gaap_FiniteLivedIntangibleAssetsNet
/ dei_LegalEntityAxis
= csal_ConsumerCLECBusinessMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember