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Income Taxes - Reconciliation Between Statutory Federal Income Tax Rate and Effective Income Tax (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract]      
Federal statutory tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State 3.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (2.30%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 0.70%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
State apportionment rate change (0.20%)rrc_EffectiveIncomeTaxRateReconciliationStateApportionmentRateChange (14.90%)rrc_EffectiveIncomeTaxRateReconciliationStateApportionmentRateChange  
Non-deductible executive compensation 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost 0.70%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost 1.40%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Valuation allowances 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 3.50%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 8.80%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 2.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Consolidated effective tax rate 38.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations 22.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations 48.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations