Nature of Operations and Basis of Presentation	6 Months Ended
Jun. 30, 2020
Accounting Policies [Abstract]
Nature of Operations and Basis of Presentation	NATURE OF OPERATIONS AND BASIS OF PRESENTATION Martin Midstream Partners L.P. (the "Partnership") is a publicly traded limited partnership with a diverse set of operations focused primarily in the United States ("U.S.") Gulf Coast region. Its four primary business lines include: terminalling, processing, storage and packaging services for petroleum products and by-products including the refining of naphthenic crude oil; land and marine transportation services for petroleum products and by-products, chemicals, and specialty products; sulfur and sulfur-based products processing, manufacturing, marketing and distribution; and natural gas liquids marketing, distribution, and transportation services. The Partnership’s unaudited consolidated and condensed financial statements have been prepared in accordance with the requirements of Form 10-Q and U.S. Generally Accepted Accounting Principles ("U.S. GAAP") for interim financial reporting. Accordingly, these financial statements have been condensed and do not include all of the information and footnotes required by U.S. GAAP for annual audited financial statements of the type contained in the Partnership’s annual reports on Form 10-K. In the opinion of the management of the Partnership’s general partner, all adjustments and elimination of significant intercompany balances necessary for a fair presentation of the Partnership’s financial position, results of operations, and cash flows for the periods shown have been made. All such adjustments are of a normal recurring nature. Results for such interim periods are not necessarily indicative of the results of operations for the full year. These financial statements should be read in conjunction with the Partnership’s audited consolidated financial statements and notes thereto included in the Partnership’s annual report on Form 10-K for the year ended December 31, 2019, filed with the Securities and Exchange Commission (the "SEC") on February 14, 2020. Management has made a number of estimates and assumptions relating to the reporting of assets and liabilities and the disclosure of contingent assets and liabilities to prepare these consolidated and condensed financial statements in conformity with U.S. GAAP. Actual results could differ from those estimates. Restructuring Support Agreement. On June 25, 2020, the Partnership entered into a restructuring support agreement (as amended on July 7, 2020, the "Restructuring Support Agreement") with certain holders (the "Supporting Holders") that beneficially own, as of July 24, 2020, over 74% in principal amount of the Partnership’s 7.25% senior unsecured notes due 2021 (the "2021 Notes"), pursuant to which such holders and the Partnership agreed to enter into and implement a proposed debt restructuring transaction through an exchange offer with respect to the 2021 Notes (the "Exchange Offer") and a cash tender offer (the "Cash Tender Offer"). The Restructuring Support Agreement contemplates the following transactions: •The Partnership agreed to commence the Exchange Offer to exchange the 2021 Notes, held by eligible holders of record, for either of: (1)$650 in cash for each $1,000 in principal amount of 2021 Notes tendered (together with the Cash Tender Offer, the "Cash Offers"), (2)$1,000 in principal amount of 11.50% senior secured second lien notes due 2025 (the "Exchange Notes") for each $1,000 in principal amount of 2021 Notes tendered, and (3) (a)The right to acquire such holder’s pro rata share of $50 million of 10.00% senior secured 1.5 lien notes due 2024 (the "New Notes", and the offer of the right to acquire such New Notes, the "Rights Offering"), the proceeds of which will be used to fund the Cash Offers; (b)Holders that participate in the Rights Offering will receive Unused Proceeds (as described below) on a pro rata basis based on the principal amount of 2021 Notes participating in the Rights Offering, and $1,000 in principal amount of Exchange Notes for each $1,000 in principal amount of such holder’s 2021 Notes remaining after application of an amount (the "Unused Proceeds") equal to (i) the difference between $50 million and the amount of cash actually used in the Cash Offers multiplied by (ii) 0.85. •In connection with the Exchange Offer, the Partnership agreed to (x) commence a consent solicitation to make certain proposed amendments to the terms of the indenture governing the 2021 Notes to (i) eliminate substantially all of the restrictive covenants in the indenture governing the 2021 Notes, (ii) delete certain events of default and (iii) reduce the required time period for the Partnership to deliver a notice of redemption from at least 30 days before a redemption date to at least three business days before a redemption date and (y) solicit votes to accept the Plan, as further described below. •The Partnership also agreed to commence a Cash Tender Offer to purchase 2021 Notes for $650 in cash for each $1,000 in principal amount of 2021 Notes tendered, to the extent held by holders of record not eligible to participate in the Exchange Offer. In connection with the Cash Tender Offer, the Partnership also agreed to commence a consent solicitation to make certain proposed amendments to the terms of the indenture governing the 2021 Notes, as described above. •Each Supporting Holder agreed to tender its 2021 Notes pursuant to the terms of the Exchange Offer and to deliver corresponding consents. The Restructuring Support Agreement contemplates various closing conditions, including, among other things, the negotiation of definitive documentation and a minimum tender condition (the "Minimum Participation Condition"), as described below. If the Exchange Offer and Cash Tender Offer are unsuccessful, the Restructuring Support Agreement provides agreed-upon terms for a pre-packaged financial restructuring plan (the "Plan") to be filed in cases commenced under chapter 11 of title 11 of the United States Code (the "Bankruptcy Code" and such cases, the "Chapter 11 Cases"), subject to the terms and conditions of the Restructuring Support Agreement, including in the term sheet and the Plan attached thereto. As of 5:00 p.m., New York City time, on July 23, 2020 (the “Early Participation Date”), the Partnership received tenders of approximately $335.5 million aggregate principal amount of the 2021 Notes in the Exchange Offer and Cash Tender Offer, which represented approximately 92.045% in principal amount of the 2021 Notes. On July 31, 2020, the required amount of Supporting Holders and the Partnership entered into an amendment to the Restructuring Support Agreement that, among other things, reduced the Minimum Participation Condition from 95% to 92% in principal amount of 2021 Notes tendered. As a result, the Minimum Participation Condition has been satisfied and, subject to satisfaction of other customary closing conditions, the Exchange offer and Cash Tender Offer will be consummated on or about August 12, 2020 and the Plan will not be filed. The Supporting Holders may terminate the Restructuring Support Agreement if, among other customary termination events, the Partnership files for bankruptcy other than as contemplated by the Restructuring Support Agreement. The Partnership expects to continue the operation of its business in the ordinary course and does not anticipate interruption in its operations during the restructuring regardless of whether the Partnership conducts its restructuring in or out of the chapter 11 process. The transactions contemplated by the Restructuring Support Agreement are not intended to impact trade vendors, employees, customers, or any related contractual agreements or obligations. The Partnership’s common units will remain outstanding and are not a part of the transactions contemplated by the Restructuring Support Agreement. See Note 18, "Subsequent Events" for further discussion of the Exchange Offer and the related transactions that are being conducted pursuant to the Restructuring Support Agreement. Divestiture of Natural Gas Storage Assets. On June 28, 2019, the Partnership completed the sale of its membership interests in Arcadia Gas Storage, LLC, Cadeville Gas Storage LLC, Monroe Gas Storage Company, LLC and Perryville Gas Storage LLC (the "Natural Gas Storage Assets") to Hartree Cardinal Gas, LLC ("Hartree"), a subsidiary of Hartree Bulk Storage, LLC. The Natural Gas Storage Assets consist of approximately 50 billion cubic feet of working capacity located in northern Louisiana and Mississippi. In consideration of the sale of the Natural Gas Storage Assets, the Partnership received cash proceeds of $210,067 after transaction fees and expenses. The net proceeds were used to reduce outstanding borrowings under the Partnership's revolving credit facility. The Partnership concluded the disposition represented a strategic shift which had a major effect on its financial results going forward. As a result, the Partnership has presented the results of operations and cash flows relating to the Natural Gas Storage Assets as discontinued operations for the three and six months ended June 30, 2019. See Note 3 for more information. Impact of COVID-19 Pandemic. A novel strain of coronavirus ("COVID-19") surfaced in late 2019 and has spread around the world, including to the United States. In March 2020, the World Health Organization declared COVID-19 a pandemic. Due to the economic impacts of the COVID-19 pandemic, the markets have experienced a decline in oil prices in response to oil demand concerns. These concerns were further exacerbated by the price war among members of the Organization of Petroleum Exporting Countries ("OPEC") and other non-OPEC producer nations during the first quarter of 2020 and global storage considerations. Travel restrictions and stay-at-home orders implemented by governments in many regions and countries across the globe, including the United States, have greatly impacted the demand for refined products resulting in a significant reduction in refinery utilization. The COVID-19 pandemic has impacted the Partnership's 2020 performance to date, and the Partnership expects to continue to experience the impacts of COVID-19 throughout the remainder of 2020 as a result of continued reduction in refined product demand across the industries the Partnership serves. The extent to which the duration and severity of the pandemic impacts our business, results of operations, and financial condition, will depend on future developments, which are highly uncertain and cannot be predicted at this time. Accordingly, it is possible that the impact of the COVID-19 pandemic could have a material adverse effect on the Partnership's results of operations, financial position and cash flows for the year ended December 31, 2020, including the recoverability of long-lived assets and goodwill, the valuation of inventory, and the amount of expected credit losses. Management considered the impact of the COVID-19 pandemic on the assumptions and estimates used in the preparation of the financial statements. Management identified triggering events requiring the performance of impairment testing of long-lived assets and goodwill related to both the performance of the Partnership's unit price during the first quarter of 2020 and certain of the Partnership's businesses that are sensitive to reductions in refined product demand and refinery utilization. As a result, the Partnership recorded impairment charges totaling $4,352 related to long-lived assets during the first quarter of 2020. See Note 3 for more information. No impairments were identified related to goodwill. A sustained reduction in refinery demand and utilization could lead to future asset impairments as well as adversely affect access to capital and financing to be able to meet future obligations. Management also assessed the extent to which the current macroeconomic events brought about by COVID-19 and significant declines in refined product demand impacted the valuation of expected credit losses on accounts receivable and certain inventory items or resulted in modifications to any significant contracts. Ultimately the results of these assessments did not have a material impact on the Partnership's results as of June 30, 2020.

Martin Midstream Partners L.P. (the "Partnership") is a publicly traded limited partnership with a diverse set of operations focused primarily in the United States ("U.S.") Gulf Coast region. Its four primary business lines include: terminalling, processing, storage and packaging services for petroleum products and by-products including the refining of naphthenic crude oil; land and marine transportation services for petroleum products and by-products, chemicals, and specialty products; sulfur and sulfur-based products processing, manufacturing, marketing and distribution; and natural gas liquids marketing, distribution, and transportation services.

The Partnership’s unaudited consolidated and condensed financial statements have been prepared in accordance with the requirements of Form 10-Q and U.S. Generally Accepted Accounting Principles ("U.S. GAAP") for interim financial reporting. Accordingly, these financial statements have been condensed and do not include all of the information and footnotes required by U.S. GAAP for annual audited financial statements of the type contained in the Partnership’s annual reports on Form 10-K. In the opinion of the management of the Partnership’s general partner, all adjustments and elimination of significant intercompany balances necessary for a fair presentation of the Partnership’s financial position, results of operations, and cash flows for the periods shown have been made. All such adjustments are of a normal recurring nature. Results for such interim periods are not necessarily indicative of the results of operations for the full year. These financial statements should be read in conjunction with the Partnership’s audited consolidated financial statements and notes thereto included in the Partnership’s annual report on Form 10-K for the year ended December 31, 2019, filed with the Securities and Exchange Commission (the "SEC") on February 14, 2020.

Management has made a number of estimates and assumptions relating to the reporting of assets and liabilities and the disclosure of contingent assets and liabilities to prepare these consolidated and condensed financial statements in conformity with U.S. GAAP. Actual results could differ from those estimates.

Restructuring Support Agreement. On June 25, 2020, the Partnership entered into a restructuring support agreement (as amended on July 7, 2020, the "Restructuring Support Agreement") with certain holders (the "Supporting Holders") that beneficially own, as of July 24, 2020, over 74% in principal amount of the Partnership’s 7.25% senior unsecured notes due 2021 (the "2021 Notes"), pursuant to which such holders and the Partnership agreed to enter into and implement a proposed debt restructuring transaction through an exchange offer with respect to the 2021 Notes (the "Exchange Offer") and a cash tender offer (the "Cash Tender Offer").

(a)The right to acquire such holder’s pro rata share of $50 million of 10.00% senior secured 1.5 lien notes due 2024 (the "New Notes", and the offer of the right to acquire such New Notes, the "Rights Offering"), the proceeds of which will be used to fund the Cash Offers;

(b)Holders that participate in the Rights Offering will receive Unused Proceeds (as described below) on a pro rata basis based on the principal amount of 2021 Notes participating in the Rights Offering, and $1,000 in principal amount of Exchange Notes for each $1,000 in principal amount of such holder’s 2021 Notes remaining after application of an amount (the "Unused Proceeds") equal to (i) the difference between $50 million and the amount of cash actually used in the Cash Offers multiplied by (ii) 0.85.

•In connection with the Exchange Offer, the Partnership agreed to (x) commence a consent solicitation to make certain proposed amendments to the terms of the indenture governing the 2021 Notes to (i) eliminate substantially all of the restrictive covenants in the indenture governing the 2021 Notes, (ii) delete certain events of default and (iii) reduce the required time period for the Partnership to deliver a notice of redemption from at least 30 days before a redemption date to at least three business days before a redemption date and (y) solicit votes to accept the Plan, as further described below.

•The Partnership also agreed to commence a Cash Tender Offer to purchase 2021 Notes for $650 in cash for each $1,000 in principal amount of 2021 Notes tendered, to the extent held by holders of record not eligible to participate in the Exchange Offer. In connection with the Cash Tender Offer, the Partnership also agreed to commence a consent solicitation to make certain proposed amendments to the terms of the indenture governing the 2021 Notes, as described above.

The Restructuring Support Agreement contemplates various closing conditions, including, among other things, the negotiation of definitive documentation and a minimum tender condition (the "Minimum Participation Condition"), as described below. If the Exchange Offer and Cash Tender Offer are unsuccessful, the Restructuring Support Agreement provides agreed-upon terms for a pre-packaged financial restructuring plan (the "Plan") to be filed in cases commenced under chapter 11 of title 11 of the United States Code (the "Bankruptcy Code" and such cases, the "Chapter 11 Cases"), subject to the terms and conditions of the Restructuring Support Agreement, including in the term sheet and the Plan attached thereto.

As of 5:00 p.m., New York City time, on July 23, 2020 (the “Early Participation Date”), the Partnership received tenders of approximately $335.5 million aggregate principal amount of the 2021 Notes in the Exchange Offer and Cash Tender Offer, which represented approximately 92.045% in principal amount of the 2021 Notes. On July 31, 2020, the required amount of Supporting Holders and the Partnership entered into an amendment to the Restructuring Support Agreement that, among other things, reduced the Minimum Participation Condition from 95% to 92% in principal amount of 2021 Notes tendered. As a result, the Minimum Participation Condition has been satisfied and, subject to satisfaction of other customary closing conditions, the Exchange offer and Cash Tender Offer will be consummated on or about August 12, 2020 and the Plan will not be filed.

The Partnership expects to continue the operation of its business in the ordinary course and does not anticipate interruption in its operations during the restructuring regardless of whether the Partnership conducts its restructuring in or out of the chapter 11 process. The transactions contemplated by the Restructuring Support Agreement are not intended to impact trade vendors, employees, customers, or any related contractual agreements or obligations. The Partnership’s common units will remain outstanding and are not a part of the transactions contemplated by the Restructuring Support Agreement.

Divestiture of Natural Gas Storage Assets. On June 28, 2019, the Partnership completed the sale of its membership interests in Arcadia Gas Storage, LLC, Cadeville Gas Storage LLC, Monroe Gas Storage Company, LLC and Perryville Gas Storage LLC (the "Natural Gas Storage Assets") to Hartree Cardinal Gas, LLC ("Hartree"), a subsidiary of Hartree Bulk Storage, LLC. The Natural Gas Storage Assets consist of approximately 50 billion cubic feet of working capacity located in northern Louisiana and Mississippi. In consideration of the sale of the Natural Gas Storage Assets, the Partnership received cash proceeds of $210,067 after transaction fees and expenses. The net proceeds were used to reduce outstanding borrowings under the Partnership's revolving credit facility. The Partnership concluded the disposition represented a strategic shift which had a major effect on its financial results going forward. As a result, the Partnership has presented the results of operations and

Impact of COVID-19 Pandemic. A novel strain of coronavirus ("COVID-19") surfaced in late 2019 and has spread around the world, including to the United States. In March 2020, the World Health Organization declared COVID-19 a pandemic. Due to the economic impacts of the COVID-19 pandemic, the markets have experienced a decline in oil prices in response to oil demand concerns. These concerns were further exacerbated by the price war among members of the Organization of Petroleum Exporting Countries ("OPEC") and other non-OPEC producer nations during the first quarter of 2020 and global storage considerations. Travel restrictions and stay-at-home orders implemented by governments in many regions and countries across the globe, including the United States, have greatly impacted the demand for refined products resulting in a significant reduction in refinery utilization.

The COVID-19 pandemic has impacted the Partnership's 2020 performance to date, and the Partnership expects to continue to experience the impacts of COVID-19 throughout the remainder of 2020 as a result of continued reduction in refined product demand across the industries the Partnership serves. The extent to which the duration and severity of the pandemic impacts our business, results of operations, and financial condition, will depend on future developments, which are highly uncertain and cannot be predicted at this time. Accordingly, it is possible that the impact of the COVID-19 pandemic could have a material adverse effect on the Partnership's results of operations, financial position and cash flows for the year ended December 31, 2020, including the recoverability of long-lived assets and goodwill, the valuation of inventory, and the amount of expected credit losses.

Management considered the impact of the COVID-19 pandemic on the assumptions and estimates used in the preparation of the financial statements. Management identified triggering events requiring the performance of impairment testing of long-lived assets and goodwill related to both the performance of the Partnership's unit price during the first quarter of 2020 and certain of the Partnership's businesses that are sensitive to reductions in refined product demand and refinery utilization. As a result, the Partnership recorded impairment charges totaling $4,352 related to long-lived assets during the first quarter of 2020. See Note 3 for more information. No impairments were identified related to goodwill. A sustained reduction in refinery demand and utilization could lead to future asset impairments as well as adversely affect access to capital and financing to be able to meet future obligations. Management also assessed the extent to which the current macroeconomic events brought about by COVID-19 and significant declines in refined product demand impacted the valuation of expected credit losses on accounts receivable and certain inventory items or resulted in modifications to any significant contracts. Ultimately the results of these assessments did not have a material impact on the Partnership's results as of June 30, 2020.