Statement of Financial Position [Abstract] ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Receivables, net of allowance Accounts Receivable, Net, Current Inventories: Inventory, Net [Abstract] Raw materials and supplies Inventory, Raw Materials and Supplies, Net of Reserves Work in process Inventory, Work in Process, Net of Reserves Finished goods Inventory, Finished Goods, Net of Reserves Total inventory Inventory, Net Other Other Assets, Current Total current assets Assets, Current Property, plant, and equipment, net Property, Plant and Equipment, Net Goodwill Goodwill Deferred income taxes Deferred Tax Assets, Net, Noncurrent Other assets Other Assets, Noncurrent Total assets Assets LIABILITIES AND PARENT EQUITY Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued liabilities Accrued Liabilities, Current Current portion of long-term debt Long-term Debt and Capital Lease Obligations, Current Total current liabilities Liabilities, Current Debt Long-term Debt and Capital Lease Obligations Deferred income taxes Deferred Tax Liabilities, Net, Noncurrent Other liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Parent equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Net parent investment Stockholders' Equity, Parent Company Investment, Net Stockholders' Equity, Parent Company Investment, Net Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total stockholders' equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders' equity Liabilities and Equity Property, Plant and Equipment [Abstract] Components of property, plant, and equipment Property, Plant and Equipment [Table Text Block] Accounting Policies [Abstract] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Transportation Products Group Transportation Products Group [Domain] Transportation Products Group [Domain] Energy Equipment Group Energy Equipment Group [Member] Energy Equipment Group. Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Wind towers and utility structures Wind towers and utility structures [Domain] Wind towers and utility structures Other Other [Member] Other [Member] Inland barge Inland barge [Domain] Inland barge [Domain] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Unsatisfied performance obligations, Amount Revenue, Remaining Performance Obligation, Amount Unsatisfied performance obligations, Percent expected to be delivered in 2018 Revenue, remaining performance obligation expected to be delivered in current year Revenue, remaining performance obligation expected to be delivered in current year Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Sales by Arcosa to Trinity businesses Revenue from Related Parties Purchases by Arcosa from Trinity businesses Related Party Transaction, Purchases from Related Party Segment Reporting [Abstract] Segment Information Segment Reporting Disclosure [Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Construction aggregates Construction aggregates [Domain] Construction aggregates [Domain] Steel components Steel components [Domain] Steel components [Domain] Construction Products Group Construction Products Group [Member] Construction products group. All Other Other Segments [Member] Corporate Segment Corporate Segment [Member] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Intersegment Intersegment Eliminations [Member] Total Operating Segments [Member] Corporate Corporate, Non-Segment [Member] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Eliminations Consolidation, Eliminations [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Total revenues Revenues Operating profit (loss) Operating Income (Loss) Basis of Presentation Consolidation, Policy [Policy Text Block] Relationship with Parent and Related Entities Related Party Transactions Disclosure [Text Block] Revenue Recognition Revenue Recognition, Policy [Policy Text Block] Income Tax Income Tax, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Concentration of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Other Comprehensive Income (Loss) Comprehensive Income, Policy [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Transactions with Other Trinity Businesses Schedule of Related Party Transactions [Table Text Block] Unsatisfied Performance Obligations Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] ASU 2014-09 Adoption Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] Other Income and Expenses [Abstract] Other, Net Other Income and Other Expense Disclosure [Text Block] Income Tax Disclosure [Abstract] Reconciliation between the statutory United States Federal income tax rate and the Company's effective income tax rate Effective Income Tax Rate Reconciliation, Percent [Abstract] Statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent State taxes Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Foreign adjustments Effective Income Tax Rate Reconciliation, Tax Settlement, Foreign, Percent Domestic production activities deduction ARC Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Percent ARC Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Percent Impairment and other foreign losses EffectiveIncomeTaxRateReconciliationImpairmentandOtherForeignLossesPercent EffectiveIncomeTaxRateReconciliationImpairmentandOtherForeignLossesPercent Changes in valuation allowance and reserves Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Effect of Federal Tax Reform Effective Income Tax Rate Reconciliation, Effect of Tax Cuts and Jobs Act, Percent Effective Income Tax Rate Reconciliation, Effect of Tax Cuts and Jobs Act, Percent Prior year true-ups Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent Equity compensation Effective Income Tax Reconciliation, Equity Compensation Effective Income Tax Reconciliation, Equity Compensation Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective rate Effective Income Tax Rate Reconciliation, Percent Guarantees [Abstract] Guarantees Guarantees [Text Block] Number of principal business segments of Company Number of Reportable Segments Line of Credit Facility [Table] Line of Credit Facility [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Trinity Industries, Inc. Trinity Industries, Inc. [Member] Trinity Industries, Inc. [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Senior Notes Senior Notes [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility Revolving Credit Facility [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Senior notes Senior Notes Interest rate Debt Instrument, Interest Rate, Effective Percentage Borrowings under Revolving Credit Facility Line of Credit Facility, Amount Outstanding Exclusive of Letters of Credit Line of Credit Facility, Amount Outstanding Exclusive of Letters of Credit New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2014-09 [Member] Accounting Standards Update 2014-09 [Member] Balance without adjustment for ASU 2014-09 [Domain] Balance without adjustment for ASU 2014-09 [Domain] Balance without adjustment for ASU 2014-09 [Domain] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Revenues Cost of revenues Cost of Goods and Services Sold Operating profit Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Provision for income taxes Income Tax Expense (Benefit) Net income Net Income (Loss) Attributable to Parent Provision for deferred income taxes Deferred Income Tax Expense (Benefit) (Increase) decrease in receivables Increase (Decrease) in Accounts Receivable (Increase) decrease in inventories Increase (Decrease) in Inventories Increase (decrease) in accrued liabilities Increase (Decrease) in Accrued Liabilities Net cash provided (required) by operating activities Net Cash Provided by (Used in) Operating Activities Goodwill and Intangible Assets Disclosure [Abstract] Goodwill by segment Schedule of Goodwill [Table Text Block] Commitments and Contingencies Disclosure [Abstract] Contingencies Commitments and Contingencies Disclosure [Text Block] Income Statement [Abstract] Operating costs: Operating Expenses [Abstract] Selling, engineering, and administrative expenses Selling, General and Administrative Expense Impairment charge Asset Impairment Charges Total operating costs Operating Expenses Total operating profit Other, net (income) expense Nonoperating Income (Expense) Income before income taxes Net income Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Statement of Cash Flows [Abstract] Cash, Cash Equivalents, and Restricted Cash Period Increase (Decrease), Excluding Exchange Rate Effect [Abstract] Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect [Abstract] Operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Stock-based compensation expense Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Gains on dispositions of property and other assets Gain (Loss) on Disposition of Property Plant Equipment (Increase) decrease in other assets Increase (Decrease) in Other Noncurrent Assets Increase (decrease) in other liabilities Increase (Decrease) in Other Noncurrent Liabilities Other Other Noncash Income (Expense) Changes in current assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] (Increase) decrease in other current assets Increase (Decrease) in Other Current Assets Increase (decrease) in accounts payable Increase (Decrease) in Accounts Payable Net cash provided by operating activities Investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Proceeds from dispositions of property and other assets Proceeds from Sale of Property, Plant, and Equipment Capital expenditures Payments to Acquire Property, Plant, and Equipment Acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Net cash required by investing activities Net Cash Provided by (Used in) Investing Activities Financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Payments to retire debt Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities Proceeds from issuance of debt Proceeds from Issuance of Long-term Debt and Capital Securities, Net Net transfers from/(to) parent and affiliates Net Transfers From To Parent and Affiliates Net Transfers From To Parent and Affiliates Payment for contingent consideration liability Holdback Payment for Contingent Consideration Liability, Financing Activities Holdback Payment for Contingent Consideration Liability, Financing Activities Net cash required by financing activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Reconciliation between the statutory U.S. federal income tax rate and the Company's effective income tax rate on income before income taxes Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Loss Contingencies [Table] Loss Contingencies [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Environmental and workplace matters Environmental and Workplace Matters [Member] Environmental and Workplace Matters Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Accrued liabilities Accrued Liabilities [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Total accruals Loss Contingency Accrual Range of possible loss Loss Contingency, Estimate of Possible Loss Financial information for segments Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Property Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Land Land [Member] Buildings and improvements Building and Building Improvements [Member] Machinery and other Machinery and Equipment [Member] Construction in progress Construction in Progress [Member] Property Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Components of property, plant, and equipment Property, Plant and Equipment, Net [Abstract] Property, plant and equipment, at cost Property, Plant and Equipment, Gross Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Other, net (income) expense Other Nonoperating Income (Expense) [Abstract] Foreign currency exchange transactions Foreign Currency Transaction Gain (Loss), before Tax Other Other Income (Expense), Nonoperating Other Income (Expense), Nonoperating Other, net (income) expense Other Nonoperating Income (Expense) Other, net (income) expense Schedule of Other Nonoperating Income (Expense) [Table Text Block] Property, Plant, and Equipment Property, Plant and Equipment Disclosure [Text Block] Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Document and Entity Information [Abstract] Document and entity information. Entities [Table] Entities [Table] Entity Information [Line Items] Entity Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Subsequent Event [Table] Subsequent Event [Table] Line of Credit Line of Credit [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Common stock distribution Dividends, Common Stock, Stock Cash contribution received in connection with separation Proceeds from Contributions from Parent LIBOR variable rate spread Debt Instrument, Basis Spread on Variable Rate Line of credit facility, commitment fee amount Line of Credit Facility, Commitment Fee Percentage Letters of credit outstanding, amount Letters of Credit Outstanding, Amount Retirement Benefits [Abstract] Employee Benefits and Share-based Compensation Employee Benefits and Share-based Compensation Contributions to multiemployer plan Multiemployer Plan, Contributions by Employer Expected full year contributions by the employer to the multiemployer plan Multiemployer Plan, Expected Contributions in Current Fiscal Year Multiemployer Plan, Expected Contributions in Current Fiscal Year Income Taxes Income Tax Disclosure [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Business Combinations [Abstract] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] ACG Materials ACG Materials [Member] ACG Materials [Member] Acquisition price Business Combination, Consideration Transferred Goodwill acquired Goodwill, Acquired During Period Business Combination, Consideration Disclosed in Definitive Agreement Business Combination, Consideration Disclosed in Definitive Agreement Business Combination, Consideration Disclosed in Definitive Agreement Revenue from divested businesses Disposal Group, Including Discontinued Operation, Revenue Assets held for sale Disposal Group, Including Discontinued Operation, Assets, Current Liabilities held for sale Disposal Group, Including Discontinued Operation, Liabilities, Current Stock-based compensation Allocated Share-based Compensation Expense Acquisitions and Divestitures Mergers, Acquisitions and Dispositions Disclosures [Text Block] Goodwill Goodwill Disclosure [Text Block] Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] AOCI attributable to parent AOCI Attributable to Parent [Member] ASU 2014-09 retained earnings decrease New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets Employee Retirement Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Statement of Parent Equity [Abstract] Statement of Parent Equity [Abstract] Statement [Table] Statement [Table] Restatement [Axis] Restatement [Axis] Restatement [Domain] Restatement [Domain] Report Date [Axis] Report Date [Axis] Financial Statement Filing Date [Domain] Financial Statement Filing Date [Domain] Net parent investment Net Parent Investment [Domain] Net Parent Investment [Domain] Parent Parent [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Adjustments for Change in Accounting Principle [Axis] Adjustments for Change in Accounting Principle [Axis] Adjustments for Change in Accounting Principle [Domain] Adjustments for Change in Accounting Principle [Domain] Adjustments for Error Corrections [Axis] Adjustments for Error Corrections [Axis] Adjustments for Error Correction [Domain] Adjustments for Error Correction [Domain] Statement [Line Items] Statement [Line Items] Cumulative effect of adopting accounting standards (see Note 1) CumulativeEffectofNewAccountingPrincipleinPeriodofAdoption(Duration) CumulativeEffectofNewAccountingPrincipleinPeriodofAdoption(Duration) Net transfers from parent and affiliates Restricted shares, net Net Parent Investment Total stockholders' equity Schedule of Goodwill [Table] Schedule of Goodwill [Table] Goodwill [Line Items] Goodwill [Line Items] Corporate overhead costs Cost, Overhead