Organization, Business and Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2019
Organization, Business and Basis of Presentation
Interim Consolidated Financial Information	Interim Consolidated Financial Information The accompanying unaudited consolidated financial statements of the Company were prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial reporting pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to the rules and regulations of the SEC. The Company believes that the disclosures made are adequate to make the information presented not misleading. In the opinion of management, all adjustments, consisting only of normal recurring adjustments, necessary to fairly state the financial position, results of operations, comprehensive income, stockholders’ equity and cash flows with respect to the interim consolidated financial statements, have been included. Certain reclassifications were made to prior year amounts to conform to the current year presentation. The consolidated balance sheet as of December 31, 2018 has been derived from the audited financial statements as of that date. The results of operations and comprehensive income are not necessarily indicative of the results for the full year or the results for any future periods. These financial statements should be read in conjunction with the audited financial statements and related notes for the year ended December 31, 2018, included in the Company’s Annual Report on Form 10‑K, which was filed with the SEC on March 6, 2019 (the "2018 Annual Report").
Foreign Currency	Foreign Currency The functional currency for the Company’s Canadian operations is the Canadian dollar. Assets and liabilities denominated in Canadian dollars are translated into U.S. dollars at the end-of-period exchange rate. Revenues and expenses are translated using average exchange rates for the periods reported. Equity accounts are translated at historical rates. Cumulative translation adjustments are included as a separate component of accumulated other comprehensive income in shareholders’ equity. Foreign currency transaction gains and losses, arising primarily from changes in exchange rates on short-term monetary assets and liabilities, and ineffective long-term monetary assets and liabilities are recorded in the “other income, net” line on the consolidated statements of operations. Foreign currency gains, recorded in other income, net, for the nine months ended September 30, 2019 were $0.1 million. Foreign currency gains, recorded in other income, net, for the nine months ended September 30, 2018 were not significant. Effective foreign currency transaction gains and losses, arising primarily from long-term monetary assets and liabilities, are recorded in the foreign currency translation adjustment line on the consolidated statements of comprehensive income.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and revenues and expenses during the period reported. Actual results could differ from those estimates. The most significant estimates are related to estimates of costs to complete contracts, pending change orders and claims, shared savings, insurance reserves, income tax reserves, estimates surrounding stock-based compensation, the recoverability of goodwill and intangibles and allowance for doubtful accounts. The Company estimates a cost accrual every quarter that represents costs incurred but not invoiced for services performed or goods delivered during the period, and estimates revenue from the contract cost portion of these accruals based on current gross margin rates to be consistent with its cost method of revenue recognition. In the nine months ended September 30, 2019 and 2018, the Company recognized revenues of $31.1 million and $8.8 million, respectively, related to significant change orders and/or claims that had been included as contract price adjustments on certain contracts which were in the process of being negotiated in the normal course of business. The cost-to-cost method of accounting requires the Company to make estimates about the expected revenue and gross profit on each of its contracts in process. During the three months ended September 30, 2019, changes in estimates pertaining to certain projects increased consolidated gross margin by 0.2%, which resulted in increases in operating income of $0.9 million, net income attributable to MYR Group Inc. of $0.8 million and diluted earnings per common share attributable to MYR Group Inc. of $0.05. During the nine months ended September 30, 2019, changes in estimates pertaining to certain projects decreased consolidated gross margin by 0.5%, which resulted in decreases in operating income of $7.8 million, net income attributable to MYR Group Inc. of $3.3 million and diluted earnings per common share attributable to MYR Group Inc. of $0.20. During the three months ended September 30, 2018, changes in estimates pertaining to certain projects decreased consolidated gross margin by 0.6%, which resulted in decreases in operating income of $2.1 million, net income attributable to MYR Group Inc. of $1.6 million and diluted earnings per common share attributable to MYR Group Inc of $0.09. During the nine months ended September 30, 2018, changes in estimates pertaining to certain projects decreased consolidated gross margin by 0.4%, which resulted in decreases in operating income of $3.9 million, net income attributable to MYR Group Inc. of $2.8 million and diluted earnings per common share attributable to MYR Group Inc. of $0.17.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Changes to U.S. GAAP are typically established by the Financial Accounting Standards Board (“FASB”) in the form of accounting standards updates (“ASUs”) to the FASB’s Accounting Standards Codification (“ASC”). The Company considers the applicability and impact of all ASUs. The Company, based on its assessment, determined that any recently issued or proposed ASUs not listed below are either not applicable to the Company or adoption will have minimal impact on its consolidated financial statements Recently Adopted Accounting Pronouncements In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The amendments under this pronouncement changed the way all leases with durations in excess of one year are treated. Under this guidance, lessees are required to recognize virtually all leases on the balance sheet as a right-of-use asset and an associated finance lease liability or operating lease liability. The right-of-use asset represents the lessee’s right to use, or control the use of, a specified asset for the specified lease term. The lease liability represents the lessee’s obligation to make lease payments arising from the lease, measured on a discounted basis. Based on certain characteristics, leases are classified as finance leases or operating leases. Finance lease liabilities, which contain provisions similar to capitalized leases under the prior accounting standards, are amortized as amortization expense and interest expense in the statement of operations. Operating lease liabilities and right-of-use assets are adjusted to result in a single straight-line lease expense over the life of the lease. On January 1, 2019, the Company adopted ASU No. 2016-02, Leases (Topic 842) using the modified retrospective method. The modified retrospective basis provides a method for recording existing leases at adoption and in comparative periods that approximates the results of a full retrospective approach using the cumulative-effect approach for recording the transition adjustment as of the effective date. Financial results reported in prior periods are unchanged. See Note 4–Lease Obligations for further information related to the Company’s accounting policy and transition disclosures associated with the adoption of this pronouncement. Recently Issued Accounting Pronouncements In January 2017, the FASB issued ASU No. 2017-04, Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment, which simplifies the subsequent measurement of goodwill, through the elimination of Step 2 from the goodwill impairment test. Instead, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. The update is effective for any annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The guidance requires application on a prospective basis. The Company does not expect that this pronouncement will have a significant impact on its financial statements. In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments, which introduced an expected credit loss methodology for the measurement and recognition of credit losses on most financial instruments, including trade receivables and off-balance sheet credit exposures. Under this guidance, an entity is required to consider a broader range of information to estimate expected credit losses, which may result in earlier recognition of losses. This ASU also requires disclosure of information regarding how a company developed its allowance, including changes in the factors that influenced management’s estimate of expected credit losses and the reasons for those changes. The ASU and its related clarifying updates are effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted. The adoption of this standard will be through a cumulative-effect adjustment to retained earnings as of the effective date. Based on our historical experience, the Company does not expect that this pronouncement will have a significant impact in its financial statements or on the estimate of the allowance for uncollectable accounts. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement, which modifies the disclosure requirements for Level 1, Level 2 and Level 3 instruments in the fair value hierarchy. The guidance is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted for any eliminated or modified disclosures. The adoption of this standard is not expected to have a material impact on the Company’s consolidated financial statements or disclosures. Change in Accounting Policy On January 1, 2019, the Company adopted ASU No. 2016-02, Leases (Topic 842) using the modified retrospective method. Under this guidance, the net present value of future lease payments are recorded as right-of-use assets and liabilities. In addition, the Company elected the ‘package of practical expedients’ permitted under the transition guidance within the new standard, which among other things, allowed the Company to carry forward the historical lease classification. In addition, the Company elected not to utilize the hindsight practical expedient to determine the lease term for existing leases. The Company elected the short-term lease recognition exemption for all leases that qualify. This means, for those leases that qualify, the Company did not recognize right-of-use assets or lease liabilities, including not recognizing right-of-use assets or lease liabilities for existing short-term leases of those assets in transition. The Company also elected the practical expedient to not separate lease and non-lease components for our real estate and vehicle leases. Adoption of the new standard resulted in the recording of additional operating right-of-use assets and operating lease liabilities of approximately $15.1 million, as of January 1, 2019. The adoption of Topic 842 did not impact the Company’s retained earnings, consolidated net earnings or cash flows.
Fair Value Measurements	Fair Value Measurements The Company uses the three-tier hierarchy of fair value measurement, which prioritizes the inputs used in measuring fair value based upon their degree of availability in external active markets. These tiers include: Level 1 (the highest priority), defined as observable inputs, such as quoted prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3 (the lowest priority), defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.
Earnings Per Share	Earnings Per Share The Company computes earnings per share attributable to MYR Group Inc. using the treasury stock method. Under the treasury stock method, basic earnings per share attributable to MYR Group Inc. are computed by dividing net income available to stockholders by the weighted average number of common shares outstanding during the period, and diluted earnings per share are computed by dividing net income available to stockholders by the weighted average number of common shares outstanding during the period plus all potentially dilutive common stock equivalents, except in cases where the effect of the common stock equivalent would be anti-dilutive.