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Supplemental Information on Natural Gas and Oil Exploration, Development and Production Activities (Unaudited) - Changes in Discounted Future Net Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revisions of previous estimates |  |  |
Changes in prices and production costs | $ 5,069 us-gaap_NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts | $ 2,172,704 us-gaap_NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts | $ (2,498,616)us-gaap_NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts
Revisions in quantities | 102,760 us-gaap_RevisionsOfPreviousQuantityEstimates | 513,168 us-gaap_RevisionsOfPreviousQuantityEstimates | 88,190 us-gaap_RevisionsOfPreviousQuantityEstimates
Changes in future development and abandonment costs | (407,688)us-gaap_IncreaseDecreaseInEstimatedFutureDevelopmentCosts | (275,468)us-gaap_IncreaseDecreaseInEstimatedFutureDevelopmentCosts | (354,766)us-gaap_IncreaseDecreaseInEstimatedFutureDevelopmentCosts
Net change in income taxes | (441,935)us-gaap_IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves | (1,299,227)us-gaap_IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves | 832,830 us-gaap_IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves
Accretion of discount | 789,754 us-gaap_AccretionOfDiscount | 395,989 us-gaap_AccretionOfDiscount | 608,381 us-gaap_AccretionOfDiscount
Purchases of reserves in place | 297,358 us-gaap_IncreaseDueToPurchasesOfMineralsInPlace |  |
Additions to proved reserves from extensions, discoveries and improved recovery | 2,713,999 us-gaap_ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts | 1,981,054 us-gaap_ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts | 1,429,340 us-gaap_ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts
Natural gas, NGLs and oil sales, net of production costs | (1,391,663)rrc_OilAndGasProductionCosts | (1,286,103)rrc_OilAndGasProductionCosts | (976,224)rrc_OilAndGasProductionCosts
Development costs incurred during the period | 755,384 us-gaap_PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod | 462,862 us-gaap_PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod | 562,329 us-gaap_PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod
Sales of reserves in place | (249,055)us-gaap_SalesOfOilAndGasProspects | (162,463)us-gaap_SalesOfOilAndGasProspects | (120,637)us-gaap_SalesOfOilAndGasProspects
Timing and other | (443,187)us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther | 135,910 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther | (861,919)us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther
Net change for the year | 1,730,796 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease | 2,638,426 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease | (1,291,092)us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease
Beginning of year | 5,862,231 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | 3,223,805 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | 4,514,897 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
End of year | $ 7,593,027 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | $ 5,862,231 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | $ 3,223,805 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves

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