Fair Value Disclosures [Abstract] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Subsidiary, Sale of Stock [Axis] Subsidiary, Sale of Stock [Axis] Sale of Stock, Name of Transaction [Domain] Sale of Stock, Name of Transaction [Domain] IPO and secondary offering [Member] IPO and Secondary Offering [Member] IPO and Secondary Offering [Member] IPO [Member] IPO [Member] Secondary offering [Member] Secondary Offering [Member] Secondary Offering [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Term loan [Member] Loans Payable [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving credit facility [Member] Revolving Credit Facility [Member] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] ACTOIL, LLC [Member] ACTOIL, LLC [Member] ACTOIL, LLC [Member] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] Glasscock County [Member] Glasscock County [Member] Glasscock County [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent event [Member] Subsequent Event [Member] Subsidiary, Sale of Stock [Line Items] Subsidiary, Sale of Stock [Line Items] Total number of shares sold in the IPO Sale Of Stock To Public, Number Of Shares Issued In Transaction Aggregate number of shares issued or sold in a transaction, including both new shares issued by the reporting entity and shares sold by existing shareholders. Sale of common stock in IPO (in dollars per share) Share Price Total proceeds raised in the IPO Proceeds From Sale Of Stock To Public, Gross Gross proceeds from sale of stock to the public, including both proceeds received by the reporting entity and those received by existing shareholders. Shares of common stock sold in the IPO by RSP, Inc Stock Issued During Period, Shares, New Issues Issuance of common stock Proceeds from Issuance Initial Public Offering Repayment of term loan Repayments of Other Long-term Debt Repayment of revolving credit facility Repayments of Long-term Lines of Credit Number of shares sold in IPO by existing stockholders Sale of Stock To Public, Number Of Shares Sold By Existing Stockholders Sale of Stock To Public, Number Of Shares Sold By Existing Stockholders Net profits interest (percent) Oil and Gas, Net Profits Interest, Percentage Oil and Gas, Net Profits Interest, Percentage Purchase price to acquire oil and gas properties Payments to Acquire Oil and Gas Property Proceeds from sale of common stock Proceeds from Issuance of Common Stock Earnings Per Share [Abstract] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Pro Forma Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted, Pro Forma Information [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted, Pro Forma Information [Table Text Block] Accounting Policies [Abstract] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Reclassifications Reclassification, Policy [Policy Text Block] Oil and Natural Gas Properties Oil and Gas Properties Policy [Policy Text Block] Asset Retirement Obligation Asset Retirement Obligations, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] New Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation, Restricted Stock Award Activity Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Members' Equity [Member] Member Units [Member] Statement [Line Items] Statement [Line Items] Cash distribution paid to predecessor owner Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Paid Business Combinations [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Collins and Wallace Contributions [Member] Collins and Wallace Contributions [Member] Collins and Wallace Contributions [Member] Spanish Trail Acquisition [Member] Spanish Trail Acquisition [Member] Spanish Trail Acquisition [Member] Significant Acquisitions and Disposals by Transaction [Axis] Significant Acquisitions and Disposals by Transaction [Axis] Significant Acquisitions and Disposals, Transaction [Domain] Significant Acquisitions and Disposals, Transaction [Domain] ACTOIL NPI Repurchase [Member] ACTOIL NPI Repurchase [Member] ACTOIL NPI Repurchase [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Unaudited Pro Forma Financial Information Business Acquisition, Pro Forma Information [Table Text Block] Schedule of Consideration Transferred, Assets Acquired and Liabilities Assumed Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Schedule of Significant Asset Acquisition Property, Plant and Equipment, Schedule of Significant Acquisitions and Disposals [Table Text Block] Income Statement [Abstract] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] REVENUES Revenues [Abstract] Oil sales Oil and Condensate Revenue Natural gas sales Natural Gas Production Revenue NGL sales Natural Gas Midstream Revenue Total revenues Revenues OPERATING EXPENSES Operating Expenses [Abstract] Lease operating expenses Oil and Gas Property, Lease Operating Expense Production and ad valorem taxes Taxes, Miscellaneous Depreciation, depletion and amortization Depreciation, Depletion and Amortization Asset retirement obligation accretion Asset Retirement Obligation, Accretion Expense Exploration Exploration Expense General and administrative expenses General and Administrative Expense Total operating expenses Costs and Expenses (Gain) loss on sale of assets Gain (Loss) on Disposition of Assets OPERATING INCOME Operating Income (Loss) OTHER INCOME (EXPENSE) Other Income and Expenses [Abstract] Other income (expense) Other Nonoperating Income (Expense) Gain (loss) on derivative instruments Gain (Loss) on Derivative Instruments, Net, Pretax Interest expense Interest Expense Total other income (expense) Nonoperating Income (Expense) INCOME BEFORE TAXES Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest INCOME TAX EXPENSE Income Tax Expense (Benefit) NET INCOME (LOSS) Net Income (Loss) Attributable to Parent Income (loss) per common share: Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted average number of common shares outstanding - basic Weighted Average Number of Shares Outstanding, Basic Weighted average number of common shares outstanding - diluted (2) Weighted Average Number of Shares Outstanding, Diluted Derivative Instruments and Hedging Activities Disclosure [Abstract] Offsetting of Derivative Assets and Liabilities [Abstract] Offsetting Derivative Assets [Abstract] Derivative asset, Gross Amount Presented on Balance Sheet Derivative Asset Derivative asset, Netting Adjustments Derivative, Collateral, Obligation to Return Securities and Cash Derivative, Collateral, Obligation to Return Securities and Cash Derivative asset, Net Amount Derivative Asset, Fair Value, Amount Offset Against Collateral Derivative liability, Gross Amount Presented on Balance Sheet Derivative Liability Derivative liability, Netting Adjustments Derivative, Collateral, Right to Reclaim Cash and Securities Derivative, Collateral, Right to Reclaim Cash and Securities Derivative liability, Net Amount Derivative Liability, Fair Value, Amount Offset Against Collateral Credit-Risk Related Contingent Features in Derivatives [Abstract] Derivative, Credit Risk Related Contingent Features [Abstract] Collateral posted for derivative instruments with credit-risk related contingent features Collateral Already Posted, Aggregate Fair Value Debt Disclosure [Abstract] Credit Agreement Debt Disclosure [Text Block] Acquisitions and Sales of Oil and Natural Gas Property Interests Business Combinations and Fixed Asset Acquisitions and Sales Disclosure [Text Block] Business Combinations and Fixed Asset Acquisitions and Sales Disclosure [Text Block] Schedule of Notional Amounts of Outstanding Derivative Positions Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value, Gross Basis Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Derivative Instruments, Gains (Losses) Derivative Instruments, Gain (Loss) [Table Text Block] Gross and Net Derivative Assets Offsetting Assets [Table Text Block] Gross and Net Derivative Liabilities Offsetting Liabilities [Table Text Block] Schedule of Accounts Receivable from Related Parties Schedule of Related Party Transactions [Table Text Block] Schedule of Oil and Natural Gas Properties Capitalized Costs Relating to Oil and Gas Producing Activities Disclosure [Table Text Block] Schedule of Changes in Asset Retirement Obligation Schedule of Change in Asset Retirement Obligation [Table Text Block] Schedule of Income Tax Expense Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Net purchase price Business Combination, Consideration Transferred Percentage of net profit interest transferred Business Combination, Consideration Transferred, Percentage Business Combination, Consideration Transferred, Percentage 25% NPI Sale to ACTOIL Business Combination, Consideration from Sale of Interest in Net Profits Business Combination, Consideration from Sale of Interest in Net Profits Oil and natural gas properties acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Oil and Gas Properties Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Oil and Gas Properties Asset retirement obligation assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Asset Retirement Obligation Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Asset Retirement Obligation Total net assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Term loan, face amount Debt Instrument, Face Amount Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Commodity derivative instruments [Member] Commodity Contract [Member] Interest rate derivative instruments [Member] Interest Rate Contract [Member] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Gain (loss) on derivative instruments Derivative, Gain (Loss) on Derivative, Net Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Commodity contracts [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Current amounts, Assets [Member] Other Current Assets [Member] Current amounts, Liabilities [Member] Other Current Liabilities [Member] Noncurrent amounts, Assets [Member] Other Noncurrent Assets [Member] Noncurrent amounts, Liabilities [Member] Other Noncurrent Liabilities [Member] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Derivative assets Derivative Asset, Fair Value, Gross Asset Derivative liabilities Derivative Liability, Fair Value, Gross Liability Derivative [Table] Derivative [Table] Energy [Axis] Energy [Axis] Energy [Domain] Energy [Domain] Crude Oil [Member] Crude Oil [Member] Natural Gas [Member] Fuel [Member] Derivative, by Nature [Axis] Derivative, by Nature [Axis] Derivative, Name [Domain] Derivative, Name [Domain] Swaps Maturing in 2014 [Member] Swaps Maturing in Current Fiscal Year [Member] Swaps Maturing in Current Fiscal Year [Member] Swaps Maturing in 2015 [Member] Swaps Maturing in Next Fiscal Year [Member] Swaps Maturing in Next Fiscal Year [Member] Collars Maturing in 2014 [Member] Collars Maturing in Current Fiscal Year [Member] Collars Maturing in Current Fiscal Year [Member] Collars Maturing in 2015 [Member] Collars Maturing in Next Fiscal Year [Member] Collars Maturing in Next Fiscal Year [Member] Derivative [Line Items] Derivative [Line Items] Notional volume (Bbl) Derivative, Nonmonetary Notional Amount, Volume Notional volume (Mmbtu) Derivative, Nonmonetary Notional Amount, Energy Measure Weighted average price (in dollars per Bbl) Derivative, Swap Type, Average Fixed Price Weighted average floor price (in dollars per Bbl/Mmbtu) Derivative, Average Floor Price Weighted average ceiling price (in dollars per Bbl/Mmbtu) Derivative, Average Cap Price Provision for deferred income taxes Deferred Tax Liabilities, Net Income Tax Expense (Benefit) [Abstract] Income Tax Expense (Benefit), Continuing Operations [Abstract] Current Current Income Tax Expense (Benefit) Deferred Deferred Income Tax Expense (Benefit) Income Tax Expense Equity-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Numerator: Earnings Per Share, Disclosure, Numerator [Abstract] Earnings Per Share, Disclosure, Numerator [Abstract] Income (loss) available to stockholders Net Income (Loss) Available to Common Stockholders, Basic Basic net income (loss) allocable to participating securities (1) Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units Income (loss) available to stockholders Net Income (Loss) Available to Common Stockholders, Diluted Denominator: Earnings Per Share, Disclosure, Denominator [Abstract] Earnings Per Share, Disclosure, Denominator [Abstract] Net income per share: Earnings Per Share, Basic and Diluted [Abstract] Earnings Per Share, Pro Forma [Abstract] Earnings Per Share, Pro Forma [Abstract] Income before taxes, as reported Pro forma provision for income taxes Business Acquisition, Pro Forma Income Tax Expense (Benefit) Business Acquisition, Pro Forma Income Tax Expense (Benefit) Pro forma net income available to stockholders Business Acquisition, Pro Forma Net Income (Loss) Available to Common Stockholders, Basic and Diluted, Before Adjustments Business Acquisition, Pro Forma Net Income (Loss) Available to Common Stockholders, Basic and Diluted, Before Adjustments Basic net income allocable to participating securities Business Acquisition, Pro Forma Effect on Basic and Diluted Earnings Per Share, Participating Securities, Distributed and Undistributed Business Acquisition, Pro Forma Effect on Basic and Diluted Earnings Per Share, Participating Securities, Distributed and Undistributed Pro forma net income available to stockholders Business Acquisition, Pro Forma Net Income (Loss) Available to Common Stockholders, Basic and Diluted Business Acquisition, Pro Forma Net Income (Loss) Available to Common Stockholders, Basic and Diluted Weighted average number of common shares outstanding - basic Weighted Average Basic Shares Outstanding, Pro Forma Weighted average number of common shares outstanding - diluted Pro Forma Weighted Average Shares Outstanding, Diluted Basic (in dollars per share) Basic Earnings Per Share, Pro Forma Diluted (in dollars per share) Diluted Earnings Per Share Pro Forma Derivative Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Nature of Operations and Basis of Presentation Business Description and Basis of Presentation [Text Block] Schedule of Significant Acquisitions and Disposals [Table] Schedule of Significant Acquisitions and Disposals [Table] Sale of oil and natural gas properties [Member] Sale of Oil and Natural Gas Properties [Member] Sale of Oil and Natural Gas Properties [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] RSP LLC, ACTOIL and other minority non-operating working interest owners [Member] RSP LLC, ACTOIL and Other Minority Non-operating Working Interest Owners [Member] RSP LLC, ACTOIL and Other Minority Non-operating Working Interest Owners [Member] Gain Contingencies, Nature [Axis] Gain Contingencies, Nature [Axis] Gain Contingency, Nature [Domain] Gain Contingency, Nature [Domain] Title and environmental escrow [Member] Title and Environmental Escrow [Member] Title and Environmental Escrow [Member] Indemnity escrow [Member] Indemnity Escrow [Member] Indemnity Escrow [Member] Significant Acquisitions and Disposals [Line Items] Significant Acquisitions and Disposals [Line Items] Interest in oil and natural gas assets sold (percent) Significant Acquisitions and Disposals, Option to Acquire Additional Interests, Percentage Significant Acquisitions and Disposals, Option to Acquire Additional Interests, Percentage Sales price for interest in oil and natural gas properties Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds Option to acquire additional interests Significant Acquisitions and Disposals, Option to Acquire Additional Interests Significant Acquisitions and Disposals, Option to Acquire Additional Interests Gain on sale of interest in oil and natural gas properties Significant Acquisitions and Disposals, Gain (Loss) on Sale or Disposal, Pretax Escrow held back from initial purchase price Escrow Deposit Number of escrow payments received Number of Escrow Payments Number of Escrow Payments Proceeds from collection of funds held in escrow Proceeds from Collection of Escrow Deposit Proceeds from Collection of Escrow Deposit Martin, Glasscock and Dawson counties [Member] Martin, Glasscock and Dawson Counties [Member] Martin, Glasscock and Dawson Counties [Member] Collins [Member] Collins [Member] Collins [Member] Wallace LP [Member] Wallace LP [Member] Wallace LP [Member] Number of oil and gas property acquisitions Number of Oil and Gas Property Acquisitions Number of Oil and Gas Property Acquisitions Capitalized costs, proved oil and natural gas properties Capitalized Costs, Proved Properties Consideration Transferred [Abstract] Business Combination, Consideration Transferred [Abstract] Number of common shares issued in acquisition Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Common stock issued for oil and gas properties Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Cash paid in the Collins and Wallace Contributions Payments to Acquire Businesses, Gross Total consideration for the assets contributed in the Collins and Wallace Contributions Fair Value of Assets Acquired and Liabilities Assumed [Abstract] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] Fair value of oil and natural gas properties Asset retirement obligation Deferred tax liability Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent Tax percentage used to estimate book to tax differences for oil and gas properties acquired Effective Income Tax Rate Reconciliation, Percent Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table] Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table] Pro Forma [Member] Pro Forma [Member] Business Acquisition, Pro Forma Information [Line Items] Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Revenues Net income (loss) Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Eurodollar [Member] Eurodollar [Member] Federal Funds Rate [Member] Federal Funds Rate [Member] Federal Funds Rate [Member] Adjusted LIBOR rate [Member] London Interbank Offered Rate (LIBOR) [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Number of lenders in syndicated bank group Number of Financial Lenders Number of Financial Lenders Number of financial ratios Number of Financial Ratios Number of Financial Ratios Working capital ratio, required Working Capital Ratio Working Capital Ratio Minimum interest coverage ratio, required Minimum Interest Coverage Ratio Minimum Interest Coverage Ratio Leverage ratio, required Ratio of Indebtedness to EBITDAX Ratio of total debt to EBITDAX Variable rate basis, base percentage prior to adjustments Debt Instrument, Variable Rate Basis, Base Percentage Prior to Adjustments Calculation of the adjusted interest rate basis. Percentage of the unadjusted rate used in the calculation to get to the adjusted rate. Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Facility fee (percent) Line of Credit Facility, Commitment Fee Percentage Variable interest rate at period end Line of Credit Facility, Interest Rate at Period End Credit agreement, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Credit agreement, maximum borrowing capacity, lender commitments Line of Credit Facility, Maximum Borrowing Capacity, Additional Lender Commitments Line of Credit Facility, Maximum Borrowing Capacity, Additional Lender Commitments Interest rate terms, percentage of borrowing base utilized margin Debt Instrument, Interest Rate Terms, Percentage of Borrowing Base Utilized Margin Debt Instrument, Interest Rate Terms, Percentage of Borrowing Base Utilized Margin Commitments and Contingencies Disclosure [Abstract] Operating lease, term Lessee Leasing Arrangements, Operating Leases, Term of Contract Rent expense Operating Leases, Rent Expense Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset retirement obligation at beginning of period Asset Retirement Obligation Liabilities assumed Asset Retirement Obligation, Liabilities Incurred Accretion expense Asset retirement obligation at end of period Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts receivable, related party Accounts Receivable, Related Parties, Current Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] General and administrative expenses [Member] General and Administrative Expense [Member] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Restricted stock awards [Member] Restricted Stock [Member] Performance-based restricted stock awards [Member] Performance-Based Restricted Stock Awards [Member] Performance-Based Restricted Stock Awards [Member] Incentive units [Member] Incentive Units [Member] Incentive Units [Member] Incentive units, Tier I and Tier IA [Member] Incentive Units, Tier I and Tier IA [Member] Incentive Units, Tier I and Tier IA [Member] Incentive units, Tier I, Tier IA and Tier II [Member] Incentive Units, Tier I, Tier IA and Tier II [Member] Incentive Units, Tier I, Tier IA and Tier II [Member] Incentive units, Tier IA and Tier II [Member] Incentive Units, Tier IA and Tier II [Member] Incentive Units, Tier IA and Tier II [Member] Incentive units, Tier III and Tier IV [Member] Incentive Units, Tier III and Tier IV [Member] Incentive Units, Tier III and Tier IV [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based compensation expense Allocated Share-based Compensation Expense Unrecognized compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Unrecognized compensation expense, cost to be recognized during remainder of current year Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options, Cost To Be Recognized in Remainder of Fiscal Year Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options, Cost To Be Recognized in Remainder of Fiscal Year Unrecognized compensation expense, cost to be recognized in next fiscal year Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options, Cost To Be Recognized in Next Fiscal Year Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options, Cost To Be Recognized in Next Fiscal Year Unrecognized compensation expense, weighted average recognition period Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Stock awards granted during the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Target payout percentage Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Target Payout Percentage Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Target Payout Percentage Restricted Shares, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Restricted shares outstanding, beginning of period Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number Restricted shares granted Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted Restricted shares outstanding, end of period Restricted Shares, Weighted Average Grant Price [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Restricted shares outstanding, beginning of period, Weighted Average Grant Price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Restricted shares granted, Weighted Average Grant Price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Restricted shares outstanding, end of period, Weighted Average Grant Price (in dollars per share) Earnings Per Share & Pro Forma Earnings Per Share Earnings Per Share [Text Block] Minimum project term to capitalize interest Oil and Gas Property, Minimum Project Term to Capitalize Interest Oil and Gas Property, Minimum Project Term to Capitalize Interest Depletion expense Depletion of Oil and Gas Properties Costs capitalized in connection with exploratory wells in progress Capitalized Exploratory Well Costs Impairment of proved properties Impairment of Oil and Gas Properties Conversion of natural gas volumes to barrel of oil equivalent Production, Barrels of Oil Equivalents Oil and Natural Gas Properties [Abstract] Oil and Gas Property [Abstract] Proved oil and natural gas properties Proved Oil and Gas Property, Successful Effort Method Unproved oil and natural gas properties Unproved Oil and Gas Property, Successful Effort Method Total oil and natural gas properties Oil and Gas Property, Successful Effort Method, Gross Less: accumulated depletion Oil and Gas Property, Successful Effort Method, Accumulated Depreciation, Depletion and Amortization Total oil and natural gas properties, net Oil and Gas Property, Successful Effort Method, Net Document and Entity Information [Abstract] Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Recurring basis [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Derivative liabilities Derivative assets Number of shares issued for ACTOIL NPI Repurchase Significant Acquisitions and Disposals, Equity Interests Issued Or Issuable, Number Of Shares Issued Significant Acquisitions and Disposals, Equity Interests Issued Or Issuable, Number Of Shares Issued Value of the 10,816,626 shares of the Company’s common stock issued in the ACTOIL NPI Repurchase Significant Acquisitions and Disposals, Consideration Transferred, Equity Interests Issued and Issuable Significant Acquisitions and Disposals, Consideration Transferred, Equity Interests Issued and Issuable Elimination of NPI payable Significant Acquisitions and Disposals, Consideration Transferred, Liabilities Released Significant Acquisitions and Disposals, Consideration Transferred, Liabilities Released Oil and natural gas properties cost Significant Acquisitions and Disposals, Consideration Transferred, Oil and Gas Property Significant Acquisitions and Disposals, Consideration Transferred, Oil and Gas Property Asset retirement obligation Significant Acquisitions and Disposals, Consideration Transferred, Asset Retirement Obligation Significant Acquisitions and Disposals, Consideration Transferred, Asset Retirement Obligation Deferred tax asset Significant Acquisitions and Disposals, Consideration Transferred, Deferred Tax Asset Significant Acquisitions and Disposals, Consideration Transferred, Deferred Tax Asset Total consideration for the assets contributed in the ACTOIL NPI Repurchase Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Common Stock [Member] Common Stock [Member] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Accumulated Deficit [Member] Retained Earnings [Member] Stockholders' Equity/Members' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Total Stockholders' Equity/Members' Equity, beginning balance Stockholders' Equity Attributable to Parent Issued Shares of Common Stock, beginning balance Common Stock, Shares, Issued Distribution of net assets to predecessor owner, including cash of $1,663 Adjustments to Additional Paid in Capital, Distribution of Net Assets to Predecessor Adjustments to Additional Paid in Capital, Distribution of Net Assets to Predecessor The corporate reorganization Adjustments to Additional Paid in Capital, Corporate Reorganization Adjustments to Additional Paid in Capital, Corporate Reorganization RSP Permian Holdco, L.L.C.’s contributions of interests in RSP Permian, L.L.C. in exchange for RSP Permian, Inc.’s common stock, Shares Stock Issued During Period, Shares, Transactions to Affect Change in Corporate Structure Stock Issued During Period, Shares, Transactions to Affect Change in Corporate Structure RSP Permian Holdco, L.L.C.’s contributions of interests in RSP Permian, L.L.C. in exchange for RSP Permian, Inc.’s common stock, Value Stock Issued During Period, Value, Transactions to Affect Change in Corporate Structure Stock Issued During Period, Value, Transactions to Affect Change in Corporate Structure Ted Collins, Jr., Wallace Family Partnership, LP, Collins & Wallace Holdings, LLC, Pecos Energy Partners, L.P. and ACTOIL LLC’s contributions in exchange for RSP Permian, Inc.’s common stock Stock Issued During Period, Value, Acquisitions and Purchase of Assets Stock Issued During Period, Value, Acquisitions and Purchase of Assets Shares of common stock sold in initial public offering net of offering costs, Shares Shares of common stock sold in initial public offering net of offering costs, Value Stock Issued During Period, Value, New Issues Equity-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Net loss Total Stockholders' Equity/Members' Equity, ending balance Issued Shares of Common Stock, ending balance Fair Value Measurements Fair Value Disclosures [Text Block] Statement of Financial Position [Abstract] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common stock, shares outstanding Common Stock, Shares, Outstanding ASSETS Assets [Abstract] CURRENT ASSETS Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable Accounts Receivable, Net, Current Escrow receivable Other Receivables, Gross, Current Escrow deposit Derivative instruments Derivative Asset, Current Total current assets Assets, Current PROPERTY, PLANT AND EQUIPMENT Property, Plant and Equipment [Abstract] Oil and natural gas properties, successful efforts method Accumulated depletion Other property and equipment, net Property, Plant and Equipment, Other, Net Total property, plant and equipment Property, Plant and Equipment, Net LONG-TERM ASSETS Assets, Noncurrent [Abstract] Derivative instruments Derivative Asset, Noncurrent Restricted cash Restricted Cash and Cash Equivalents, Noncurrent Other assets Other Assets, Noncurrent Total long-term assets Assets, Noncurrent TOTAL ASSETS Assets LIABILITIES AND STOCKHOLDERS’/MEMBERS’ EQUITY Liabilities and Equity [Abstract] CURRENT LIABILITIES Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued expenses Accrued Liabilities, Current Interest payable Interest Payable, Current Derivative instruments Derivative Liability, Current Total current liabilities Liabilities, Current LONG-TERM LIABILITIES Liabilities, Noncurrent [Abstract] Asset retirement obligations Asset Retirement Obligations, Noncurrent Derivative instruments Derivative Liability, Noncurrent Term loan Notes Payable, Noncurrent Revolving credit facility Long-term Line of Credit, Noncurrent NPI payable Other Liabilities, Noncurrent Deferred taxes Deferred Tax Liabilities, Net, Noncurrent Total long-term liabilities Liabilities, Noncurrent Total liabilities Liabilities STOCKHOLDERS’/MEMBERS’ EQUITY Equity [Abstract] Members’ equity Members' Equity Common stock, $.01 par value; 300,000,000 shares authorized, 72,500,000 shares issued and outstanding at June 30, 2014; no shares authorized, issued or outstanding at December 31, 2013 Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Accumulated deficit Retained Earnings (Accumulated Deficit) Total stockholders’/members’ equity TOTAL LIABILITIES AND STOCKHOLDERS’/MEMBERS’ EQUITY Liabilities and Equity Statement of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation, depletion and amortization Depreciation, Amortization and Accretion, Net Abandoned equipment and intangibles Asset Impairment Charges Accretion of asset retirement obligations Equity based compensation Share-based Compensation Amortization of loan fees Amortization of Financing Costs Deferred income taxes Equity in earnings of investment Income (Loss) from Equity Method Investments (Gain) on sale of assets Loss on derivative instruments Net cash payments on settled derivatives (Payments for) Proceeds from Derivative Instrument, Operating Activities (Payments for) Proceeds from Derivative Instrument, Operating Activities Changes in operating assets and liabilities: Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract] Accounts receivable and accounts receivable from related parties Increase (Decrease) in Accounts Receivable and Accounts Receivable, Related Parties Increase (Decrease) in Accounts Receivable and Accounts Receivable, Related Parties Other assets Increase (Decrease) in Other Operating Assets Interest payable Increase (Decrease) in Interest Payable, Net Accounts payable Increase (Decrease) in Accounts Payable Accrued expenses Increase (Decrease) in Accrued Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations CASH FLOWS FROM INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities [Abstract] Proceeds from sale of assets Proceeds from Sale of Productive Assets Additions to other property and equipment Payments to Acquire Other Property, Plant, and Equipment Additions to oil and natural gas properties Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations CASH FLOWS FROM FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities [Abstract] Distributions Payments of Capital Distribution Payment of deferred loan costs Payments of Debt Issuance Costs Borrowings under long-term debt Proceeds from Issuance of Long-term Debt Payments on long-term debt Repayments of Long-term Debt NPI payable Net Profit Interest Payable, Financing Activities Net Profit Interest Payable, Financing Activities Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations NET CHANGE IN CASH Cash and Cash Equivalents, Period Increase (Decrease) CASH AT BEGINNING OF PERIOD CASH AT END OF PERIOD SUPPLEMENTAL CASH FLOW INFORMATION Supplemental Cash Flow Information [Abstract] Cash paid for interest Interest Paid Cash paid for taxes Income Taxes Paid NON-CASH ACTIVITIES Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Asset retirement obligation acquired Noncash or Part Noncash Acquisition, Asset Retirement Obligations Assumed Noncash or Part Noncash Acquisition, Asset Retirement Obligations Assumed Deferred tax liabilities recorded for oil and gas property acquisitions Noncash or Part Noncash Acquisition, Deferred Tax Liabilities Noncash or Part Noncash Acquisition, Deferred Tax Liabilities Elimination of NPI payable Noncash or Part Noncash Acquisition, Value of Liabilities Released Noncash or Part Noncash Acquisition, Value of Liabilities Released