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Supplemental Information on Natural Gas and Oil Exploration, Development and Production Activities (Unaudited) - Standardized Measure of Discounted Future Net Cash Flows (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Extractive Industries [Abstract]        
Future cash inflows $ 46,507,646us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows $ 35,143,097us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows    
Future costs:        
Production (15,239,210)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts (10,176,140)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts    
Development (4,275,693)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts [1] (3,938,296)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts [1]    
Future net cash flows before income taxes 26,992,743rrc_DiscountedFutureNetCashFlowsRelatingToProveOilAndGasReservesFutureIncomeBeforeTaxExpense 21,028,661rrc_DiscountedFutureNetCashFlowsRelatingToProveOilAndGasReservesFutureIncomeBeforeTaxExpense    
Future income tax expense (8,900,383)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense (6,913,196)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense    
Total future net cash flows before 10% discount 18,092,360us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows 14,115,465us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows    
10% annual discount (10,499,333)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows (8,253,234)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows    
Standardized measure of discounted future net cash flows $ 7,593,027us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves $ 5,862,231us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves $ 3,223,805us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves $ 4,514,897us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
[1] 2014 includes $439.6 million of undiscounted future asset retirement costs estimated as of December 31, 2014, using current estimates of future abandonment costs.