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Derivative Instruments, Hedging Activities and Accumulated Other Comprehensive Income (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2012
Derivative Instruments, Hedging Activities and Accumulated Other Comprehensive Income [Abstract]      
Notional amount of cash flow hedges $ 165,900,000us-gaap_DerivativeAssetNotionalAmount    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Accumulated Other Comprehensive Income (Loss), net of tax   1,122,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Accumulated Other Comprehensive Income (Loss), net of tax 215,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 1,122,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Gains and (Losses) on Cash Flow Hedges [Member]      
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]      
Accumulated Other Comprehensive Income (Loss), before Tax 1,871,000us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		    
Other comprehensive loss before reclassifications, before tax (1,922,000)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		    
Amounts reclassified from accumulated other comprehensive income (to interest expense), before tax 404,000us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		    
Net current period other comprehensive loss, before tax (1,518,000)us-gaap_OtherComprehensiveIncomeLossBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		    
Accumulated Other Comprehensive Income (Loss), before Tax 353,000us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		    
Accumulated Other Comprehensive Income (Loss), Tax [Abstract]      
Accumulated Other Comprehensive Income (Loss), tax (749,000)shen_AccumulatedOtherComprehensiveIncomeLossTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		    
Other comprehensive income before reclassifications, tax 773,000shen_OtherComprehensiveIncomeLossBeforeReclassificationsTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		    
Amounts reclassified From accumulated other comprehensive income (to interest expense), tax (162,000)shen_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		    
Net current period other comprehensive income (loss), tax 611,000us-gaap_OtherComprehensiveIncomeLossTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		    
Accumulated Other Comprehensive Income (Loss), tax (138,000)shen_AccumulatedOtherComprehensiveIncomeLossTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Accumulated Other Comprehensive Income (Loss), net of tax 1,122,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		    
Other comprehensive income before reclassifications, net of tax (1,149,000)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		    
Amounts reclassified from accumulated other comprehensive income (to interest expense), net of tax 242,000us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		    
Net current period other comprehensive income (loss), net of tax (907,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		    
Accumulated Other Comprehensive Income (Loss), net of tax 215,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		    
Interest Rate Swap [Member]      
Derivatives, Fair Value [Line Items]      
Amount of notional principal interest rate swap     174,600,000us-gaap_DerivativeAmountOfHedgedItem
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Assets (Liabilities), at Fair Value, Net 353,000us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 1,871,000us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		  
Designated as Hedging Instrument [Member] | Accrued liabilities and other [Member] | Interest Rate Swap [Member]      
Derivatives, Fair Value [Line Items]      
Derivatives Liabilities, Fair Value (1,257,000)us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 (1,309,000)us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		  
Designated as Hedging Instrument [Member] | Deferred charges, and other assets net [Member] | Interest Rate Swap [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Assets, Fair Value 1,610,000us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= shen_DeferredChargesAndOtherAssetsNetMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 3,180,000us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= shen_DeferredChargesAndOtherAssetsNetMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		  
Interest Expense [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount reclassified as an increase to interest expense during next twelve months $ 1,300,000us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember