Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets
Cash	$ 8,407us-gaap_Cash	$ 6,287us-gaap_Cash
Restricted Cash and Investments, Current	609	0
Accounts receivable
Oil and natural gas revenues	28,976us-gaap_AccountsReceivableNetCurrent	25,823us-gaap_AccountsReceivableNetCurrent
Joint interest billings	6,925	4,785
Other	9,091us-gaap_OtherReceivablesNetCurrent	1,066us-gaap_OtherReceivablesNetCurrent
Derivative instruments	55,549us-gaap_DerivativeAssetsCurrent	19us-gaap_DerivativeAssetsCurrent
Deferred income taxes	0us-gaap_DeferredTaxAssetsNetCurrent	1,636us-gaap_DeferredTaxAssetsNetCurrent
Lease and well equipment inventory	1,212mtdr_LeaseAndWellEquipmentInventory	785mtdr_LeaseAndWellEquipmentInventory
Prepaid Expense and Other Assets, Current	2,554	2,474
Total current assets	113,323us-gaap_AssetsCurrent	42,875us-gaap_AssetsCurrent
Oil and natural gas properties, full-cost method
Evaluated	1,617,913	1,090,656
Unproved and unevaluated	264,419	194,306
Other property and equipment	43,472us-gaap_PropertyPlantAndEquipmentOther	29,910us-gaap_PropertyPlantAndEquipmentOther
Less accumulated depletion, depreciation and amortization	(603,732)	(468,995)
Net property and equipment	1,322,072us-gaap_PropertyPlantAndEquipmentNet	845,877us-gaap_PropertyPlantAndEquipmentNet
Other assets
Derivative instruments	0us-gaap_DerivativeAssetsNoncurrent	173us-gaap_DerivativeAssetsNoncurrent
Other assets	896us-gaap_OtherAssetsNoncurrent	1,405us-gaap_OtherAssetsNoncurrent
Total other assets	896us-gaap_OtherAssets	1,578us-gaap_OtherAssets
Total assets	1,436,291us-gaap_Assets	890,330us-gaap_Assets
Current liabilities
Accounts payable	17,526us-gaap_AccountsPayableCurrent	25,358us-gaap_AccountsPayableCurrent
Accrued liabilities	109,502us-gaap_AccruedLiabilitiesCurrent	63,987us-gaap_AccruedLiabilitiesCurrent
Royalties payable	14,461us-gaap_AccruedRoyaltiesCurrent	7,798us-gaap_AccruedRoyaltiesCurrent
Derivative instruments	0us-gaap_DerivativeLiabilitiesCurrent	2,692us-gaap_DerivativeLiabilitiesCurrent
Deferred income taxes	19,751us-gaap_DeferredTaxLiabilitiesCurrent	0us-gaap_DeferredTaxLiabilitiesCurrent
Income taxes payable	444us-gaap_AccruedIncomeTaxesCurrent	404us-gaap_AccruedIncomeTaxesCurrent
Other current liabilities	103us-gaap_OtherLiabilitiesCurrent	88us-gaap_OtherLiabilitiesCurrent
Total current liabilities	161,787us-gaap_LiabilitiesCurrent	100,327us-gaap_LiabilitiesCurrent
Long-term liabilities
Borrowings under Credit Agreement	340,000us-gaap_LongTermLineOfCredit	200,000us-gaap_LongTermLineOfCredit
Asset retirement obligations	11,640	7,309
Derivative instruments	0us-gaap_DerivativeLiabilitiesNoncurrent	253us-gaap_DerivativeLiabilitiesNoncurrent
Deferred income taxes	53,783	10,929
Other long-term liabilities	2,540us-gaap_OtherLiabilitiesNoncurrent	2,588us-gaap_OtherLiabilitiesNoncurrent
Total long-term liabilities	407,963us-gaap_LiabilitiesNoncurrent	221,079us-gaap_LiabilitiesNoncurrent
Commitments and contingencies (Note 13)
Shareholders' equity
Common stock — Class A, $0.01 par value, 80,000,000 shares authorized; 73,373,744 and 66,958,867 shares issued; 73,342,777 and 65,652,690, shares outstanding, respectively	734us-gaap_CommonStockValue	670us-gaap_CommonStockValue
Additional paid-in capital	724,819us-gaap_AdditionalPaidInCapital	548,935us-gaap_AdditionalPaidInCapital
Retained earnings	140,855	30,084
Treasury stock, at cost, 30,967 and 1,306,177 shares, respectively	0us-gaap_TreasuryStockValue	(10,765)us-gaap_TreasuryStockValue
Total shareholders' equity	866,408us-gaap_StockholdersEquity	568,924us-gaap_StockholdersEquity
Stockholders' Equity Attributable to Noncontrolling Interest	133us-gaap_MinorityInterest	0us-gaap_MinorityInterest
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	866,541	568,924
Total liabilities and shareholders' equity	$ 1,436,291	$ 890,330

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Capitalized costs of unproved properties incurred for any combination mineral interests acquisitions and other costs not previously disclosed within this table.

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The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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Current portion of accounts receivable attributable to joint interest partners in oil and gas properties. These are billings to the non-operators associated with the operation of wells and are based on those owners' working interests in the wells. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

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Oil and gas properties, gross, carried under the full cost method.

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Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount before accumulated depreciation, depletion and amortization of other physical assets used in the normal conduct of business to produce goods and services and not intended for resale.

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The current cash, cash equivalents and investments that are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes current cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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