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Income Taxes - Additional Information (Details) (USD $)
1 Months Ended 12 Months Ended
May 31, 2013
Dec. 31, 2014
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2011
Operating Loss Carryforwards [Line Items]          
Change in valuation allowance     $ (151,394,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance    
Statutory federal income tax rate (in hundredths)   35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate      
Gross unrecognized tax benefits   3,700,000us-gaap_UnrecognizedTaxBenefits 3,700,000us-gaap_UnrecognizedTaxBenefits 3,700,000us-gaap_UnrecognizedTaxBenefits  
Accrued interest on unrecognized tax benefits     0us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued 0us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued 0us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued
Increase of equity if deferred tax assets are ultimately realized   14,800,000nxst_EffectOfEquityIfDeferredTaxAssetsAreUltimatelyRealized      
Conversion of stock shares by principal stockholder (in shares) 3,865,384nxst_ConversionOfStockSharesByPrincipalStockholder        
2015   209,000,000nxst_OperatingLossCarryforwardsLimitationsOnUseYearOne      
2016   91,000,000nxst_OperatingLossCarryforwardsLimitationsOnUseYearTwo      
2017   91,000,000nxst_OperatingLossCarryforwardsLimitationsOnUseYearThree      
2018   45,000,000nxst_OperatingLossCarryforwardsLimitationsOnUseYearFour      
Annually thereafter   21,000,000nxst_OperatingLossCarryforwardsLimitationsOnUseYearThereafter      
Federal [Member]          
Operating Loss Carryforwards [Line Items]          
Operating loss carryforwards   333,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
     
State [Member]          
Operating Loss Carryforwards [Line Items]          
Operating loss carryforwards   $ 69,900,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember