BASIS OF PRESENTATION (Policies)	6 Months Ended
Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The accompanying unaudited condensed consolidated financial statements include the accounts of U.S. Concrete, Inc. and its subsidiaries (collectively, "we," "us," "our," the "Company," or "U.S. Concrete") and have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the "SEC") for reporting interim financial information. Some information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States ("U.S. GAAP") have been condensed or omitted pursuant to the SEC’s rules and regulations. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes in our Annual Report on Form 10-K for the year ended December 31, 2019 (the "2019 10-K"). In the opinion of our management, all material adjustments necessary to state fairly the information in our unaudited condensed consolidated financial statements have been included. All adjustments are of a normal, recurring nature. All amounts are presented in United States dollars, unless otherwise noted. Certain computations may be impacted by the effect of rounding in this report. Operating results for interim periods are not necessarily indicative of the results that may be expected for the full year due to the impact of the coronavirus ("COVID-19") pandemic, weather patterns, and general economic conditions in our markets. Certain reclassifications have been made to prior year amounts to conform with the current year presentation.
Use of Estimates	The preparation of financial statements and accompanying notes in conformity with U.S. GAAP requires the use of estimates and assumptions by management in determining the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. We base our estimates on the information available at the time, our experiences and various other assumptions believed to be reasonable under the circumstances, including estimates of the impact of the COVID-19 pandemic. Actual results could differ from those estimates, including the impact of the COVID-19 pandemic. Estimates and assumptions that we consider significant in the preparation of our financial statements include those related to our business combinations, goodwill, intangibles, accruals for self-insurance, income taxes, valuation of contingent consideration, allowance for doubtful accounts, the valuation of inventory and the valuation and useful lives of property, plant and equipment.
Fair Value Measurement, Policy	The fair value of acquired receivables, inventory, machinery and equipment, land and buildings are based on inputs derived principally from, or corroborated by, observable market data (i.e., Level 2 inputs). The fair value of machinery and equipment, land and buildings was based on a market valuation approach or a cost valuation approach when a market valuation approach was unavailable. The estimates used for determining the fair value of the mineral reserves were unobservable and significant to the overall measurement (i.e., Level 3 inputs). The fair value of the mineral reserves was determined using an excess earnings approach, which required management to estimate future cash flows, net of capital investments in the specific operation. Management’s cash flow projections involved the use of significant estimates and assumptions with respect to the expected production of the aggregate facility over the estimated time period, sales prices, shipment volumes, and expected profit margins. The present value of the projected net cash flows represents the preliminary fair value assigned to mineral reserves. The discount rate is a significant assumption used in the valuation model.

BASIS OF PRESENTATION (Policies)

6 Months Ended

Jun. 30, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

The accompanying unaudited condensed consolidated financial statements include the accounts of U.S. Concrete, Inc. and its subsidiaries (collectively, "we," "us," "our," the "Company," or "U.S. Concrete") and have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the "SEC") for reporting interim financial information. Some information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States ("U.S. GAAP") have been condensed or omitted pursuant to the SEC’s rules and regulations. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes in our Annual Report on Form 10-K for the year ended December 31, 2019 (the "2019 10-K"). In the opinion of our management, all material adjustments necessary to state fairly the information in our unaudited condensed consolidated financial statements have been included. All adjustments are of a normal, recurring nature. All amounts are presented in United States dollars, unless otherwise noted. Certain computations may be impacted by the effect of rounding in this report. Operating results for interim periods are not necessarily indicative of the results that may be expected for the full year due to the impact of the coronavirus ("COVID-19") pandemic, weather patterns, and general economic conditions in our markets. Certain reclassifications have been made to prior year amounts to conform with the current year presentation.

Use of Estimates

The preparation of financial statements and accompanying notes in conformity with U.S. GAAP requires the use of estimates and assumptions by management in determining the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. We base our estimates on the information available at the time, our experiences and various other assumptions believed to be reasonable under the circumstances, including estimates of the impact of the COVID-19 pandemic. Actual results could differ from those estimates, including the impact of the COVID-19 pandemic. Estimates and assumptions that we consider significant in the preparation of our financial statements include those related to our business combinations, goodwill, intangibles, accruals for self-insurance, income taxes, valuation of contingent consideration, allowance for doubtful accounts, the valuation of inventory and the valuation and useful lives of property, plant and equipment.

Fair Value Measurement, Policy

The fair value of acquired receivables, inventory, machinery and equipment, land and buildings are based on inputs derived principally from, or corroborated by, observable market data (i.e., Level 2 inputs). The fair value of machinery and equipment, land and buildings was based on a market valuation approach or a cost valuation approach when a market valuation approach was unavailable. The estimates used for determining the fair value of the mineral reserves were unobservable and significant to the overall measurement (i.e., Level 3 inputs). The fair value of the mineral reserves was determined using an excess earnings approach, which required management to estimate future cash flows, net of capital investments in the specific operation. Management’s cash flow projections involved the use of significant estimates and assumptions with respect to the expected production of the aggregate facility over the estimated time period, sales prices, shipment volumes, and expected profit margins. The present value of the projected net cash flows represents the preliminary fair value assigned to mineral reserves. The discount rate is a significant assumption used in the valuation model.