Revolving credit agreement.

No definition available.

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Namespace Prefix:	mtdr_
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Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
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-Section S99
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-Subparagraph (SX 210.7-03(a)(16))
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-Subparagraph (SX 210.5-02(22))
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
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+ Details

Name:	us-gaap_LongTermLineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

+ References

+ Details

Name:	us-gaap_SecuredLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mtdr_SeniorNotesDue2026Member
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mtdr_SBALoanCARESActMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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Debt (Details) - USD ($) $ in Thousands	Oct. 27, 2020	Sep. 30, 2020	Dec. 31, 2019
Revolving Credit Agreement [Line Items]
Line of credit facility		$ 475,000	$ 255,000
Unsecured SBA loan		1,040,602	1,039,416
Borrowings under San Mateo Credit Facility		326,400	$ 288,000
Unsecured Debt \| Senior Notes Due 2026
Revolving Credit Agreement [Line Items]
Long-term debt outstanding		1,050,000
Unsecured Debt \| SBA Loan, CARES Act
Revolving Credit Agreement [Line Items]
Long-term debt outstanding		7,500
Letter of Credit
Revolving Credit Agreement [Line Items]
Outstanding letters of credit		45,100
Line of Credit \| San Mateo Credit Facility
Revolving Credit Agreement [Line Items]
Outstanding letters of credit		9,000
Borrowings under San Mateo Credit Facility		$ 326,400
Subsequent Event
Revolving Credit Agreement [Line Items]
Line of credit facility	$ 475,000
Subsequent Event \| Unsecured Debt \| Senior Notes Due 2026
Revolving Credit Agreement [Line Items]
Long-term debt outstanding	1,050,000
Subsequent Event \| Unsecured Debt \| SBA Loan, CARES Act
Revolving Credit Agreement [Line Items]
Long-term debt outstanding	7,500
Subsequent Event \| Letter of Credit
Revolving Credit Agreement [Line Items]
Outstanding letters of credit	45,100
Subsequent Event \| Line of Credit \| San Mateo Credit Facility
Revolving Credit Agreement [Line Items]
Outstanding letters of credit	9,000
Borrowings under San Mateo Credit Facility	$ 326,400