Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document Type Amendment Flag Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Filer Category Trading Symbol Entity Common Stock, Shares Outstanding Entity Emerging Growth Company Entity Small Business Statement of Financial Position [Abstract] Statement [Table] Class of Stock [Axis] Class of Stock [Domain] Statement [Line Items] Assets [Abstract] ASSETS Assets, Current Total current assets Property, Plant and Equipment, Net Property and equipment, net of accumulated depreciation of $260,743 and $253,495, respectively Assets, Current [Abstract] Current assets: Accounts Receivable, Net, Current Accounts receivable, net of allowances of $2,020 and $1,331, respectively Contract with Customer, Asset, Net, Current Contract assets Contract assets Insurance Settlements Receivable, Current Current portion of receivable for insurance claims in excess of deductibles Other Assets, Current Other current assets Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Beginning of period End of period Goodwill Goodwill Intangible Assets, Net (Excluding Goodwill) Intangible assets, net of accumulated amortization of $7,765 and $7,031, respectively Insurance Settlements Receivable, Noncurrent Receivable for insurance claims in excess of deductibles Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Investment in joint ventures Other Assets, Noncurrent Other assets Assets Total assets Operating Lease, Right-of-Use Asset Operating lease right-of-use assets Additional right of use lease assets Liabilities [Abstract] LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities Stockholders' Equity Attributable to Parent [Abstract] Stockholders' equity: Stockholders' Equity Attributable to Noncontrolling Interest Noncontrolling interest Preferred Stock, Value, Outstanding Preferred stock—$0.01 par value per share; 4,000,000 authorized shares; none issued and outstanding at March 31, 2019 and December 31, 2018 Common Stock, Value, Issued Common stock—$0.01 par value per share; 100,000,000 authorized shares; 16,610,032 and 16,564,961 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively Stockholders' Equity Attributable to Parent Total stockholders' equity attributable to MYR Group Inc. Additional Paid in Capital, Common Stock Additional paid-in capital Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated other comprehensive loss Retained Earnings (Accumulated Deficit) Retained earnings Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total stockholders' equity Balance Balance Deferred Income Tax Liabilities, Net Deferred income tax liabilities Long-term Debt, Excluding Current Maturities Long-term debt Long-term debt Long-term principal obligations Self Insurance Reserve, Noncurrent Accrued self-insurance Other Liabilities, Noncurrent Other liabilities Liabilities Total liabilities Commitments and Contingencies Commitments and contingencies Liabilities and Equity Total liabilities and stockholders' equity Liabilities, Current [Abstract] Current liabilities: Current Self Insurance Reserve, Current Current portion of accrued self-insurance Accrued Income Taxes, Current Income taxes payable, net Other Liabilities, Current Other current liabilities Liabilities, Current Total current liabilities Accounts Payable, Current Accounts payable Contract with Customer, Liability, Current Contract liabilities Contract liabilities Contract liabilities Long-term Debt, Current Maturities Current portion of long-term debt Less: Current portion of long-term debt Less: Current portion of equipment notes Operating Lease, Liability, Current Current portion of operating lease obligations Operating lease obligations Less: Current portion of financing and operating lease obligations Finance Lease, Liability, Current Current portion of finance lease obligations Finance lease obligations Less: Current portion of financing and operating lease obligations Operating Lease, Liability, Noncurrent Operating lease obligations, net of current maturities Operating lease obligations Long-term financing and operating lease obligations Finance Lease, Liability, Noncurrent Finance lease obligations, net of current maturities Finance lease obligations Long-term financing and operating lease obligations Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock, Shares Authorized Common stock, shares authorized (in shares) Common Stock, Shares, Issued Common stock, shares issued (in shares) Common Stock, Shares, Outstanding Common stock, shares outstanding (in shares) Allowance for Doubtful Accounts Receivable, Current Allowance for doubtful accounts receivable Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property and equipment, accumulated depreciation Finite-Lived Intangible Assets, Accumulated Amortization Intangible assets, accumulated amortization Preferred Stock, Par or Stated Value Per Share Preferred stock, par value (in dollars per share) Preferred Stock, Shares Authorized Preferred stock, shares authorized (in shares) Preferred Stock, Shares Outstanding Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Issued Preferred stock, shares issued (in shares) Income Statement [Abstract] Restatement [Axis] Restatement [Domain] Revenue from Contract with Customer, Excluding Assessed Tax Contract revenues Amount Amount Contract revenues Contract revenues Cost of Goods and Services Sold Contract costs Earnings Per Share [Abstract] Income per common share attributable to MYR Group Inc.: Income per common share attributable to MYR Group Inc.: Earnings Per Share, Basic Basic (in dollars per share) Basic (in dollars per share) Earnings Per Share, Diluted Diluted (in dollars per share) Increase (decrease) in diluted earnings per common share (in dollars per share) Diluted (in dollars per share) Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted average number of common shares and potential common shares outstanding: Weighted Average Number of Shares Outstanding, Diluted Diluted (in shares) Weighted average common shares outstanding, diluted (in shares) Weighted Average Number of Shares Outstanding, Basic Basic (in shares) Weighted average common shares outstanding (in shares) Gross Profit Gross profit Selling, General and Administrative Expense Selling, general and administrative expenses Amortization of Intangible Assets Amortization of intangible assets Gain (Loss) on Disposition of Property Plant Equipment Gain on sale of property and equipment Gain on sale of property and equipment Operating Income (Loss) Income from operations Increase (decrease) in operating income Income from operations Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income Net income Net income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Other comprehensive loss: Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Foreign currency translation adjustment Other Comprehensive Income (Loss), Net of Tax Other comprehensive loss Other comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Total comprehensive income Net Income (Loss) Attributable to Parent Net income attributable to MYR Group Inc Increase (decrease) in net income Net income attributable to MYR Group Inc. Net Income (Loss) Attributable to Noncontrolling Interest Less: net loss attributable to noncontrolling interest Less: net loss attributable to noncontrolling interest Net income attributable to noncontrolling interest Nonoperating Income (Expense) [Abstract] Other income (expense): Other Nonoperating Income (Expense) Other income, net Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income before provision for income taxes Income Tax Expense (Benefit) Income tax expense Interest Expense Interest expense Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total comprehensive income attributable to MYR Group Inc. Statement of Stockholders' Equity [Abstract] Stock Issued During Period, Value, Other Stock issued - other Shares, Outstanding Balance (in shares) Balance (in shares) Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Stock issued under compensation plans, net Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Stock issued under compensation plans, net (in shares) Stock Repurchased and Retired During Period, Value Shares repurchased Stock Repurchased and Retired During Period, Shares Shares repurchased (in shares) Cumulative Effect of New Accounting Principle in Period of Adoption Adjustment to adopt ASU No. 2016-09 Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock-based compensation expense Equity Components [Axis] Equity Component [Domain] Preferred Stock [Member] Common Stock [Member] Additional Paid-In Capital [Member] Retained Earnings [Member] Parent [Member] MYR Group Inc. Stockholders' Equity [Member] Noncontrolling Interest [Member] Noncontrolling Interest [Member] AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Income (loss) [Member] Statement of Cash Flows [Abstract] Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash flows provided by (used in) operating activities: Depreciation Depreciation and amortization of property and equipment Share-based Compensation Stock-based compensation expense Deferred Income Taxes and Tax Credits Deferred income taxes Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable, net Increase (Decrease) in Contract with Customer, Asset Contract assets Changes in contract assets Changes in contract assets Increase (Decrease) in Insurance Settlements Receivable Receivable for insurance claims in excess of deductibles Increase (Decrease) in Other Operating Assets Other assets Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Contract with Customer, Liability Contract liabilities Changes in contract liabilities Increase (Decrease) in Self Insurance Reserve Accrued self insurance Increase (Decrease) in Other Operating Liabilities Other liabilities Other Noncash Income (Expense), Total Other non-cash items Net Cash Provided by (Used in) Operating Activities Net cash flows provided by (used in) operating activities Cash and Cash Equivalents, Period Increase (Decrease) Net decrease in cash and cash equivalents Cash and Cash Equivalents, at Carrying Value [Abstract] Cash and cash equivalents: Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities: Proceeds from (Repayments of) Lines of Credit Net borrowings (repayments) under revolving lines of credit Net Cash Provided by (Used in) Financing Activities Net cash flows provided by (used in) financing activities Effect of Exchange Rate on Cash Effect of exchange rate changes on cash Repayments of Long-term Capital Lease Obligations Payment of principal obligations under capital leases Proceeds from Stock Options Exercised Proceeds from exercise of stock options Payments for Repurchase of Common Stock Repurchase of common shares Proceeds from (Payments for) Other Financing Activities Other financing activities Repayments of Notes Payable Payment of principal obligations under equipment notes Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities: Proceeds from Sale of Property, Plant, and Equipment Proceeds from sale of property and equipment Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment Net Cash Provided by (Used in) Investing Activities Net cash flows used in investing activities Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Organization, Business and Basis of Presentation Business Combinations [Abstract] Business Combination Disclosure [Text Block] Acquisition Contractors [Abstract] Long-term Contracts or Programs Disclosure [Text Block] Contract Assets and Liabilities Leases [Abstract] Lessee Operating And Finance Leases [Text Block] Lease Obligations The entire disclosure for lessee, operating and finance leases. Fair Value Disclosures [Abstract] Fair Value Disclosures [Text Block] Fair Value Measurements Debt Disclosure [Abstract] Debt Disclosure [Text Block] Debt Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Text Block] Revenue Recognition Income Tax Disclosure [Abstract] Income Tax Disclosure [Text Block] Income Taxes Commitments and Contingencies Disclosure [Abstract] Commitments Contingencies and Guarantees [Text Block] Commitments and Contingencies Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock-Based Compensation Segment Reporting [Abstract] Segment Reporting Disclosure [Text Block] Segment Information Noncontrolling Interest [Abstract] Noncontrolling Interest Disclosure [Text Block] Noncontrolling Interest Earnings Per Share [Text Block] Earnings Per Share Consolidation, Policy [Policy Text Block] Interim Consolidated Financial Information Foreign Currency Transactions and Translations Policy [Policy Text Block] Foreign Currency Use of Estimates, Policy [Policy Text Block] Use of Estimates New Accounting Pronouncements, Policy [Policy Text Block] Recent Accounting Pronouncements Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Earnings Per Share, Policy [Policy Text Block] Earnings Per Share Fair Value Measurement, Policy [Policy Text Block] Fair Value Measurements Schedule of Business Acquisitions, by Acquisition [Table Text Block] Schedule of acquisition Costs in Excess of Billings and Billings in Excess of Costs [Table Text Block] Schedule of net asset position for contracts in process Contract with Customer, Asset and Liability [Table Text Block] Schedule of contract assets and liabilities from contracts with customers Lease, Cost [Table Text Block] Summary of lease costs Schedule Of Lease Supplemental Cash Flow And Other Disclosures [Table Text Block] Summary of other and supplemental cash flow information related to leases Tabular disclosure of lease supplemental cash flow and other disclosures. Schedule of Supplemental Balance Sheet Information Related to Leases [Table Text Block] Summary of lease related assets and liabilities Schedule of supplemental balance sheet information related to leases. Schedule Of Summary Of The Lease Terms And Discount Rates [Table Text Block] Summary of lease terms and discount rates Schedule of summary of the lease terms and discount rates. Lessee, Operating Lease, Liability, Maturity [Table Text Block] Schedule of future minimum operating lease payments Finance Lease, Liability, Maturity [Table Text Block] Schedule of future minimum finance lease payments