BASIS OF PRESENTATION AND CONSOLIDATION AND ACCOUNTING POLICIES (Policies)	3 Months Ended
Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation The accompanying Condensed Consolidated Financial Statements and notes thereto, have been prepared in accordance with U.S. GAAP for interim financial information and in accordance with the rules and regulations of the SEC. Accordingly, they do not include all of the information and notes required by U.S. GAAP for complete financial statements. Results for interim periods are not necessarily indicative of the results that can be expected for a full year and therefore should be read in conjunction with the Company’s audited Financial Statements and notes thereto included within the Company’s 2023 Form 10-K. All intercompany balances and transactions have been eliminated in consolidation. The accompanying Condensed Consolidated Financial Statements reflect the consolidated accounts of the parent company, Group 1 Automotive, Inc. and its subsidiaries, all of which are wholly owned.
Use of Estimates	Use of Estimates The preparation of the Company’s financial statements in conformity with U.S. GAAP requires management to make certain estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities, the disclosures of contingent assets and liabilities at the balance sheet date and the amounts of revenues and expenses recognized during the reporting period. Management analyzes the Company’s estimates based on historical experience and other assumptions that are believed to be reasonable under the circumstances; however, actual results could differ materially from such estimates. Significant estimates were made by management in the accompanying Condensed Consolidated Financial Statements, related to, but not limited to, inventory valuation adjustments, reserves for future chargebacks on finance, insurance and vehicle service contract fees, self-insured property and casualty insurance exposure, the fair value of assets acquired and liabilities assumed in business combinations, the valuation of goodwill and intangible franchise rights and reserves for potential litigation.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-07, Segment Reporting (Topic 820): Improvements to Reportable Segment Disclosures. The amendments require the disclosure of significant segment expenses as well as expanded interim disclosures, along with other changes to segment disclosure requirements. The standard will be effective for fiscal years beginning after December 15, 2023, and interim periods beginning on or after January 1, 2025. The Company is currently evaluating the impact that the adoption of the provisions of the ASU will have on its consolidated financial statements. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. The amendments require the disclosure of a reconciliation between income tax expense from continuing operations and the amount computed by multiplying income from continuing operations before income taxes by the applicable statutory rate as well as an annual disaggregation of the income tax rate reconciliation between certain specified categories by both percentage and reported amounts, along with other changes to income tax disclosure requirements. The standard will be effective for fiscal years beginning after December 15, 2024, and interim periods for fiscal years beginning after December 15, 2025. The Company is currently evaluating the impact that the adoption of the provisions of the ASU will have on its consolidated financial statements.
Fair Value Measurement	Accounting standards define fair value as the price that would be received from selling an asset or paid to transfer a liability in the most advantageous market in an orderly transaction between market participants at the measurement date. Accounting standards establish a fair value hierarchy that requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value and establishes the following three levels of inputs that may be used to measure fair value: •Level 1 — Quoted prices for identical assets or liabilities in active markets. •Level 2 — Observable inputs other than Level 1 prices such as quoted prices for similar assets and liabilities; quoted prices in markets that are not active; or model-derived valuations or other inputs that are observable or that can be corroborated by observable market data for substantially the full term of the assets or liabilities. •Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

BASIS OF PRESENTATION AND CONSOLIDATION AND ACCOUNTING POLICIES (Policies)

3 Months Ended

Mar. 31, 2024

Organization, Consolidation and Presentation of Financial Statements [Abstract]

The accompanying Condensed Consolidated Financial Statements and notes thereto, have been prepared in accordance with U.S. GAAP for interim financial information and in accordance with the rules and regulations of the SEC. Accordingly, they do not include all of the information and notes required by U.S. GAAP for complete financial statements. Results for interim periods are not necessarily indicative of the results that can be expected for a full year and therefore should be read in conjunction with the Company’s audited Financial Statements and notes thereto included within the Company’s 2023 Form 10-K. All intercompany balances and transactions have been eliminated in consolidation. The accompanying Condensed Consolidated Financial Statements reflect the consolidated accounts of the parent company, Group 1 Automotive, Inc. and its subsidiaries, all of which are wholly owned.

Use of Estimates

The preparation of the Company’s financial statements in conformity with U.S. GAAP requires management to make certain estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities, the disclosures of contingent assets and liabilities at the balance sheet date and the amounts of revenues and expenses recognized during the reporting period. Management analyzes the Company’s estimates based on historical experience and other assumptions that are believed to be reasonable under the circumstances; however, actual results could differ materially from such estimates. Significant estimates were made by management in the accompanying Condensed Consolidated Financial Statements, related to, but not limited to, inventory valuation adjustments, reserves for future chargebacks on finance, insurance and vehicle service contract fees, self-insured property and casualty insurance exposure, the fair value of assets acquired and liabilities assumed in business combinations, the valuation of goodwill and intangible franchise rights and reserves for potential litigation.

Recent Accounting Pronouncements

In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-07, Segment Reporting (Topic 820): Improvements to Reportable Segment Disclosures. The amendments require the disclosure of significant segment expenses as well as expanded interim disclosures, along with other changes to segment disclosure requirements. The standard will be effective for fiscal years beginning after December 15, 2023, and interim periods beginning on or after January 1, 2025. The Company is currently evaluating the impact that the adoption of the provisions of the ASU will have on its consolidated financial statements.

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. The amendments require the disclosure of a reconciliation between income tax expense from continuing operations and the amount computed by multiplying income from continuing operations before income taxes by the applicable statutory rate as well as an annual disaggregation of the income tax rate reconciliation between certain specified categories by both percentage and reported amounts, along with other changes to income tax disclosure requirements. The standard will be effective for fiscal years beginning after December 15, 2024, and interim periods for fiscal years beginning after December 15, 2025. The Company is currently evaluating the impact that the adoption of the provisions of the ASU will have on its consolidated financial statements.

Fair Value Measurement

Accounting standards define fair value as the price that would be received from selling an asset or paid to transfer a liability in the most advantageous market in an orderly transaction between market participants at the measurement date. Accounting standards establish a fair value hierarchy that requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value and establishes the following three levels of inputs that may be used to measure fair value:

•Level 1 — Quoted prices for identical assets or liabilities in active markets.

•Level 2 — Observable inputs other than Level 1 prices such as quoted prices for similar assets and liabilities; quoted prices in markets that are not active; or model-derived valuations or other inputs that are observable or that can be corroborated by observable market data for substantially the full term of the assets or liabilities.

•Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.