Nature of Operations and Presentation of Condensed Consolidated Financial Statements (Policies)	6 Months Ended
Jun. 30, 2024
Accounting Policies [Abstract]
Nature of Operations	Nature of Operations The principal business of Superior Industries International, Inc. (referred herein as the “Company,” “Superior,” or “we” and “our”) is the design and manufacture of aluminum wheels for sale to original equipment manufacturers (“OEMs”) in North America and Europe and to the aftermarket in Europe. Our aluminum wheels are primarily sold to OEMs for factory installation on new light vehicles. We also sell aluminum wheels to the European aftermarket under the brands ATS, RIAL, ALUTEC and ANZIO. North America and Europe represent the primary markets for our products, but we have a diversified global customer base consisting of North American, European and Asian OEMs.
Presentation of Condensed Consolidated Financial Statements	Presentation of Condensed Consolidated Financial Statements The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with generally accepted accounting principles in the United States (“U.S. GAAP”) pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) for interim financial information. Accordingly, they do not include all the information and notes required by U.S. GAAP for complete financial statements. These unaudited condensed consolidated financial statements include all adjustments, of a normal and recurring nature, which management believes are necessary for fair presentation of the financial statements. This Quarterly Report on Form 10-Q should be read in conjunction with our consolidated financial statements and notes thereto filed with the SEC in our 2023 Annual Report on Form 10-K. These unaudited condensed consolidated financial statements include the accounts of the Company and its subsidiaries. All intercompany transactions are eliminated in consolidation. Interim financial reporting standards require us to make estimates that are based on assumptions regarding the outcome of future events and circumstances not known at that time. Inevitably, some assumptions will not materialize, unanticipated events or circumstances may occur which vary from those estimates and such variations may significantly affect our future results. Additionally, interim results may not be indicative of our results for future interim periods or our annual results.
Accounting Standards Issued But Not Yet Adopted	Accounting Standards Issued But Not Yet Adopted Accounting Standards Update (ASU) 2023-07, “Segment Reporting.” In November 2023, the FASB issued ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures,” which is intended to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses, allowing financial statement users to better understand the components of a segment's profit or loss to assess potential future cash flows for each reportable segment and the entity as a whole. The amendments expand a public entity's segment disclosures by requiring disclosure of significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”), clarifying when an entity may report one or more additional measures to assess segment performance, requiring enhanced interim disclosures, providing new disclosure requirements for entities with a single reportable segment, and requiring other new disclosures. The amendments are effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, and early adoption is permitted. The Company is currently evaluating the effects of adopting this guidance. Accounting Standards Update (ASU) 2023-09, “Income Taxes (Topic 740).” In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures,” which is intended to enhance the transparency, decision usefulness and effectiveness of income tax disclosures. The amendments in this ASU require a public entity to disclose a tabular tax rate reconciliation, using both percentages and currency, with specific categories. A public entity is also required to provide a qualitative description of the states and local jurisdictions that make up the majority of the effect of the state and local income tax category and the net amount of income taxes paid, disaggregated by federal, state and foreign taxes and also disaggregated by individual jurisdictions. The amendments are effective prospectively for annual periods beginning after December 15, 2024, and early adoption and retrospective application are permitted. The Company is currently evaluating the effects of adopting this guidance.
Fair Value Measurements	The carrying values for cash and cash equivalents, accounts receivable, accounts payable and accrued expenses approximate their fair values due to the short period of time until maturity.
Derivatives, Methods of Accounting, Hedging Derivatives	The Company is exposed to market risks such as fluctuations in foreign currency exchange rates, interest rates, and aluminum and other commodity prices. Derivatives may be used to offset some of the effects of these market risks on the expected future cash flows and on certain existing assets and liabilities. In certain cases, the Company may or may not designate certain derivative instruments as hedges for accounting purposes. The Company may choose not to hedge certain exposures for a variety of reasons including, but not limited to, accounting considerations and the prohibitive economic cost of hedging particular exposures. Market Risks Foreign Currency Exchange Rate Risk The Company has manufacturing locations primarily in Mexico and Poland, and sells its products globally. As a result, the Company’s financial results could be significantly affected by foreign currency exchange rates. To help mitigate gross margin and cash flow fluctuations due to changes in foreign currency exchange rates, certain subsidiaries in Mexico and Poland, whose functional currency is the U.S. dollar or the Euro, hedge a portion of their forecasted foreign currency costs denominated in the Mexican Peso and Polish Zloty. The Company may hedge portions of its forecasted foreign currency exposure up to 48 months. Interest Rate Risk The Company has borrowings under its Senior Secured Credit Facilities that are at variable rates of interest and expose it to interest rate risk. If interest rates increase, debt service obligations on the variable rate indebtedness will increase even though the amount borrowed remains the same. The Company has entered into interest rate swaps exchanging floating for fixed rate interest payments in order to reduce its interest rate volatility. Commodity Price Risk The principal raw material used in manufacturing aluminum wheels is aluminum alloys. While wheel prices under OEM customer contracts are adjusted for fluctuations in the cost of this material, the prices of our aftermarket wheels are generally fixed months in advance of the spring and winter sales seasons. Accordingly, the Company hedges a portion of its aftermarket aluminum purchases to offset the effect of fluctuating aluminum cost on its margins. In addition, the manufacture of aluminum wheels is energy intensive, so the Company fixes a portion of its natural gas and electricity purchases with derivatives or contractual arrangements with energy suppliers. Derivative Financial Instruments The Company has derivatives designated as cash flow hedges that hedge the exposure to variability in expected future cash flows. These derivatives are accounted for as either assets or liabilities and adjusted to fair value each period with the resulting gain or loss recognized in other comprehensive income or loss ("OCI" or "OCL") until the underlying hedged transaction is recognized in earnings. Once the hedged transaction is recognized in earnings for foreign exchange and commodity derivatives, the gain or loss initially recorded in accumulated OCI or OCL is recognized in cost of sales, while gains or losses on interest rate swaps are recognized in interest expense, net. Derivatives that have not been designated as hedges are adjusted to fair value each period and any gain or loss is recognized in other income (expense), net

Nature of Operations and Presentation of Condensed Consolidated Financial Statements (Policies)

6 Months Ended

Jun. 30, 2024

The principal business of Superior Industries International, Inc. (referred herein as the “Company,” “Superior,” or “we” and “our”) is the design and manufacture of aluminum wheels for sale to original equipment manufacturers (“OEMs”) in North America and Europe and to the aftermarket in Europe. Our aluminum wheels are primarily sold to OEMs for factory installation on new light vehicles. We also sell aluminum wheels to the European aftermarket under the brands ATS, RIAL, ALUTEC and ANZIO. North America and Europe represent the primary markets for our products, but we have a diversified global customer base consisting of North American, European and Asian OEMs.

Presentation of Condensed Consolidated Financial Statements

The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with generally accepted accounting principles in the United States (“U.S. GAAP”) pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) for interim financial information. Accordingly, they do not include all the information and notes required by U.S. GAAP for complete financial statements. These unaudited condensed consolidated financial statements include all adjustments, of a normal and recurring nature, which management believes are necessary for fair presentation of the financial statements. This Quarterly Report on Form 10-Q should be read in conjunction with our consolidated financial statements and notes thereto filed with the SEC in our 2023 Annual Report on Form 10-K.

These unaudited condensed consolidated financial statements include the accounts of the Company and its subsidiaries. All intercompany transactions are eliminated in consolidation.

Interim financial reporting standards require us to make estimates that are based on assumptions regarding the outcome of future events and circumstances not known at that time. Inevitably, some assumptions will not materialize, unanticipated events or circumstances may occur which vary from those estimates and such variations may significantly affect our future results. Additionally, interim results may not be indicative of our results for future interim periods or our annual results.

Accounting Standards Issued But Not Yet Adopted

Accounting Standards Update (ASU) 2023-07, “Segment Reporting.” In November 2023, the FASB issued ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures,” which is intended to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses, allowing financial statement users to better understand the components of a segment's profit or loss to assess potential future cash flows for each reportable segment and the entity as a whole. The amendments expand a public entity's segment disclosures by requiring disclosure of significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”), clarifying when an entity may report one or more additional measures to assess segment performance, requiring enhanced interim disclosures, providing new disclosure requirements for entities with a single reportable segment, and requiring other new disclosures. The amendments are effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, and early adoption is permitted. The Company is currently evaluating the effects of adopting this guidance.

Accounting Standards Update (ASU) 2023-09, “Income Taxes (Topic 740).” In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures,” which is intended to enhance the transparency, decision usefulness and effectiveness of income tax disclosures. The amendments in this ASU require a public entity to disclose a tabular tax rate reconciliation, using both percentages and currency, with specific categories. A public entity is also required to provide a qualitative description of the states and local jurisdictions that make up the majority of the effect of the state and local income tax category and the net amount of income taxes paid, disaggregated by federal, state and foreign taxes and also disaggregated by individual jurisdictions. The amendments are effective prospectively for annual periods beginning after December 15, 2024, and early adoption and retrospective application are permitted. The Company is currently evaluating the effects of adopting this guidance.

Fair Value Measurements

The carrying values for cash and cash equivalents, accounts receivable, accounts payable and accrued expenses approximate their fair values due to the short period of time until maturity.

Derivatives, Methods of Accounting, Hedging Derivatives

The Company is exposed to market risks such as fluctuations in foreign currency exchange rates, interest rates, and aluminum and other commodity prices. Derivatives may be used to offset some of the effects of these market risks on the expected future cash flows and on certain existing assets and liabilities. In certain cases, the Company may or may not designate certain derivative instruments as hedges for accounting purposes. The Company may choose not to hedge certain exposures for a variety of reasons including, but not limited to, accounting considerations and the prohibitive economic cost of hedging particular exposures.

Market Risks

Foreign Currency Exchange Rate Risk

The Company has manufacturing locations primarily in Mexico and Poland, and sells its products globally. As a result, the Company’s financial results could be significantly affected by foreign currency exchange rates. To help mitigate gross margin and cash flow fluctuations due to changes in foreign currency exchange rates, certain subsidiaries in Mexico and Poland, whose functional currency is the U.S. dollar or the Euro, hedge a portion of their forecasted foreign currency costs denominated in the Mexican Peso and Polish Zloty. The Company may hedge portions of its forecasted foreign currency exposure up to 48 months.

Interest Rate Risk

The Company has borrowings under its Senior Secured Credit Facilities that are at variable rates of interest and expose it to interest rate risk. If interest rates increase, debt service obligations on the variable rate indebtedness will increase even though the amount borrowed remains the same. The Company has entered into interest rate swaps exchanging floating for fixed rate interest payments in order to reduce its interest rate volatility.

Commodity Price Risk

The principal raw material used in manufacturing aluminum wheels is aluminum alloys. While wheel prices under OEM customer contracts are adjusted for fluctuations in the cost of this material, the prices of our aftermarket wheels are generally fixed months in advance of the spring and winter sales seasons. Accordingly, the Company hedges a portion of its aftermarket aluminum purchases to offset the effect of fluctuating aluminum cost on its margins. In addition, the manufacture of aluminum wheels is energy intensive, so the Company fixes a portion of its natural gas and electricity purchases with derivatives or contractual arrangements with energy suppliers.

Derivative Financial Instruments

The Company has derivatives designated as cash flow hedges that hedge the exposure to variability in expected future cash flows. These derivatives are accounted for as either assets or liabilities and adjusted to fair value each period with the resulting gain or loss recognized in other comprehensive income or loss ("OCI" or "OCL") until the underlying hedged transaction is recognized in earnings. Once the hedged transaction is recognized in earnings for foreign exchange and commodity derivatives, the gain or loss initially recorded in accumulated OCI or OCL is recognized in cost of sales, while gains or losses on interest rate swaps are recognized in interest expense, net. Derivatives that have not been designated as hedges are adjusted to fair value each period and any gain or loss is recognized in other income (expense), net