Supplemental Information on Natural Gas and Oil Exploration, Development and Production Activities (Unaudited) - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014 MMcfe Mcfe	Dec. 31, 2013 MMcfe	Dec. 31, 2012 MMcfe
Reserve Quantities [Line Items]
Percentage of proved resources reviewed by consultants	96.00%
Statement That Reserve Estimates Differ From Auditors	more than 10%
Proved Reserve And Pretax Present Value of Reserve Discounted	10.00%
Variance in reserve estimates	less than 5%.
Scheduled to be drilling period maximum for undeveloped reserves	Scheduled to be drilled within five years
Proved reserves from drilling activities and evaluations of proved areas	2,398,709	1,732,944	1,767,202
Reserve attributable to natural gas	58.00%rrc_ReservesAttributableToNaturalGas	49.00%rrc_ReservesAttributableToNaturalGas	56.00%rrc_ReservesAttributableToNaturalGas
Positive performance energy revisions for ethane reserves	1,170,000	676,000	307,000
Revisions of previous estimates	90,822	448,898	109,036
Proved undeveloped reserves dropped	611,341rrc_ProvedUnDevelopedReservesDropped
Cost spent on undeveloped reserves transferred to developed reserves	$ 591.0
Volume of Mmcfe of reserves that have been reported for five or more years included in proved undeveloped reserves, approximately	3
Period for which the reserves have been reported to be included in proved undeveloped reserves	Five or more years.
Maximum
Reserve Quantities [Line Items]
Percentage of proved undeveloped reserves	1.00%
Year 2015
Reserve Quantities [Line Items]
Estimated future development costs	981.1
Year 2016
Reserve Quantities [Line Items]
Estimated future development costs	1,000.0
Year 2017
Reserve Quantities [Line Items]
Estimated future development costs	$ 993.5
Crude Oil
Reserve Quantities [Line Items]
Estimate reserve information average realized prices	79.04	86.66	86.91
NGLs
Reserve Quantities [Line Items]
Estimate reserve information average realized prices	27.20	25.93	32.23
Positive performance revisions for ethane reserves	264,300	155,800	51,200
Natural Gas
Reserve Quantities [Line Items]
Estimate reserve information average realized prices	4.14	3.75	2.75
Crude Oil and NGL
Reserve Quantities [Line Items]
Benchmark price used for calculating average realized prices	94.42	97.33	95.05
Natural Gas, Per Thousand Cubic Feet
Reserve Quantities [Line Items]
Benchmark price used for calculating average realized prices	4.35	3.67	2.76

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Estimated future development costs.

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The historical amount range that the internal calculations from reserve engineers have differed from the reserve consultants.

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Percentage of proved resources reviewed by consultants.

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Percentage of proved undeveloped reserves that have been reported for five or more years.

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Period for which the reserves have been reported to be included in proved undeveloped reserves.

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Proved developed and undeveloped energy reserves ethane additions.

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Proved developed and undeveloped reserves ethane additions.

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Proved reserve and pre - tax present value of reserve discounted.

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The number of Proved Undeveloped Reserves dropped in the current year due to the application of the five year rule.

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Proved undeveloped reserves transferred to developed dollar spent.

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Reserves attributable to natural gas.

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Scheduled drilling period maximum for undeveloped reserves.

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Volume of mmcfe of reserves that have been reported for five or more years included in proved undeveloped reserves approximately.

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Energy measure of increase in quantity of proved reserve of oil and gas resulting from the extension of the proved acreage of previously discovered reservoir or discovery of new field with proved reserve or of new reservoir of proved reserve in old field, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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Energy measure of increase (decrease) in quantity of proved reserve of oil and gas related to revision of a previous estimate resulting from new information, except for an increase in proved acreage, or change in economic factors, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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