Indebtedness - Guarantees and Debt Covenants and Maturity - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014
Debt Instrument [Line Items]
Debt instrument, Covenant compliance	Our bank credit facility contains negative covenants that limit our ability, among other things, to pay cash dividends, incur additional indebtedness, sell assets, enter into certain hedging contracts, change the nature of our business or operations, merge, consolidate, or make certain investments. In addition, we are required to maintain a ratio of debt to EBITDAX (as defined in the credit agreement) of no greater than 4.25 to 1.0 and a current ratio (as defined in the credit agreement) of no less than 1.0 to 1.0. During an investment grade period in which Range has only one investment grade rating, an additional covenant is imposed whereby the ratio of the present value of proved reserves (as defined in the credit agreement) to total debt must be equal to or greater than 1.5 to 1.0. We were in compliance with applicable covenants under the bank credit facility at December 31, 2014. The indentures governing our senior subordinated notes contain various restrictive covenants that are substantially identical to each other and may limit our ability to, among other things, pay cash dividends, incur additional indebtedness, sell assets, enter into transactions with affiliates, or change the nature of our business. At December 31, 2014, we were in compliance with these covenants.
Maximum
Debt Instrument [Line Items]
Ratio of debt to EBITDAX	4.25
Present Value Of Proved Reserves To Total Debt.	1.5
Minimum
Debt Instrument [Line Items]
Current ratio	1.0
Present Value Of Proved Reserves To Total Debt.	1.0