Description of Business and Basis of Presentation	9 Months Ended
Sep. 30, 2021
Accounting Policies [Abstract]
Description of Business and Basis of Presentation	Description of Business and Basis of Presentation Description of Business Mistras Group, Inc. and subsidiaries (the Company) is a leading “one source” multinational provider of integrated technology-enabled asset protection solutions helping to maximize the safety and operational uptime for civilization's most critical industrial and civil assets. Backed by an innovative, data-driven asset protection portfolio, proprietary technologies, and decades-long legacy of industry leadership, the Company helps clients with asset-intensive infrastructure in the oil and gas, aerospace and defense, industrials, power generation and transmission (including alternative and renewable energy), other process industries and infrastructure, research and engineering and other industries towards achieving and maintaining operational excellence. By supporting these organizations that help fuel our vehicles and power our society; inspecting components that are trusted for commercial, defense, and space craft; and building real-time monitoring equipment to enable safe travel across bridges, the Company helps the world at large. The Company enhances value for its clients by integrating asset protection throughout supply chains and centralizing integrity data through a suite of Industrial IoT-connected digital software and monitoring solutions, including OneSuite™, which serves as an ecosystem platform, pulling together all of the Company’s software and data services capabilities, for the benefit of its customers. The Company's core capabilities also include non-destructive testing (“NDT”) field inspections enhanced by advanced robotics, laboratory quality control and assurance testing, sensing technologies and NDT equipment, asset and mechanical integrity engineering services, and light mechanical maintenance and access services. Recent Developments The COVID-19 coronavirus (COVID-19) pandemic has continued to cause disruption and volatility in domestic and international markets and conditions continue to improve during 2021 as compared to 2020. The Company's businesses have been classified as non-healthcare critical infrastructure as defined by the U.S. Centers for Disease Control and Prevention (CDC). Our facilities, and the Company's customers facilities as well, have remained open with staffing modifications and precautionary procedures taken as necessary. Overall, the Company has taken actions to help ensure the health and safety of Company employees and those of its customers and suppliers; maintain business continuity and financial strength and stability; and serve customers as they provide essential products and services to the world. The COVID-19 pandemic uncertainty, significant volatility in oil prices, and decreased traffic in the aerospace industry have adversely affected the operations of the Company's customers, suppliers and contractors beginning in the first quarter of 2020, and as a consequence, the Company's results of operations were adversely impacted. These negative factors continue to cause volatility and uncertainty in the markets in which the Company operates, although the Company in 2021 has nevertheless begun approaching pre-pandemic levels of activity in certain end markets, particularly oil and gas where crude oil prices have exceeded pre-pandemic levels. While the Company cannot fully assess the impact that the factors discussed above will have on its operations at this time, there were certain impacts that the Company identified resulting in impairment charges in 2020. See Note 8-Goodwill, Note 9-Intangible Assets and Note 13-Leases for additional information. The Company has eliminated substantially all of the cost reduction initiatives undertaken in 2020, including re-installment of the savings plan employer match and increasing wages back to pre-pandemic amounts. The Company is currently unable to predict with certainty the overall impact that the factors discussed above may have on its business, results of operations or liquidity or in other ways which the Company cannot yet determine. The Company will continue to monitor market conditions and respond accordingly. As of September 30, 2021, the cash balance was approximately $22.6 million. Basis of Presentation The Unaudited Condensed Consolidated Financial Statements contained in this report have been prepared in conformity with U.S. generally accepted accounting principles ("GAAP") and Securities and Exchange Commission guidance allowing for reduced disclosure for interim periods. In the opinion of management, the Unaudited Condensed Consolidated Financial Statements include all adjustments, which are of a normal recurring nature, necessary for a fair presentation of the results for the interim periods of the years ending December 31, 2021 and December 31, 2020. Certain items included in these statements are based on management’s estimates. Actual results may differ from those estimates. The results of operations for any interim period are not necessarily indicative of the results expected for the year. The accompanying Unaudited Condensed Consolidated Financial Statements should be read in conjunction with the notes to the Audited Consolidated Financial Statements contained in the Company's 2020 Annual Report on Form 10-K ("2020 Annual Report"). Principles of Consolidation The accompanying Unaudited Condensed Consolidated Financial Statements include the accounts of Mistras Group, Inc. as well as its wholly-owned subsidiaries, majority-owned subsidiaries and consolidated variable interest entities (VIE). For subsidiaries in which the Company’s ownership interest is less than 100%, the non-controlling interests are reported in stockholders’ equity in the accompanying Condensed Consolidated Balance Sheets. The non-controlling interests in net results, net of tax, is classified separately in the accompanying Unaudited Condensed Consolidated Statements of Income (Loss). All significant intercompany accounts and transactions have been eliminated in consolidation. The results of operations of companies acquired are included from the date of acquisition. Reclassification Certain amounts in prior periods have been reclassified to conform to the current year presentation. Such reclassifications did not have a material effect on the Company's financial condition or results of operations as previously reported. Customers For each of the three and nine months ended September 30, 2021 and 2020, no customer represented 10% or more of the Company's revenue. Significant Accounting Policies The Company’s significant accounting policies are disclosed in Note 1–Summary of Significant Accounting Policies and Practices in the 2020 Annual Report. On an ongoing basis, the Company evaluates its estimates and assumptions, including among other things, those related to revenue recognition, long-lived assets, goodwill and acquisitions. Since the date of the 2020 Annual Report, there have been no material changes to the Company's significant accounting policies. Income Taxes Income taxes are accounted for under the asset and liability method. We recognize deferred tax assets and liabilities at enacted income tax rates for the temporary differences between the financial reporting bases and the tax bases of our assets and liabilities. Any effects of changes in income tax rates or tax laws are included in the provision for income taxes in the period of enactment. Our net deferred tax assets primarily consist of net operating loss carry forwards, or NOLs. A valuation allowance is provided if it is more likely than not that some or all of a deferred income tax asset will not be realized. A current tax liability or asset is recognized for the estimated taxes payable or refundable on tax returns for the current and prior years. As of September 30, 2021, management concluded that it is more likely than not that a substantial portion of the Company's deferred tax assets will be realized. We recognize the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the financial statements from such a position are measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate resolution. The Company’s effective income tax rate was approximately 50.8% and 25.9% for the three months ended September 30, 2021 and 2020, respectively. The Company’s effective income tax rate was approximately 44.4% and 13.6% for the nine months ended September 30, 2021 and 2020, respectively. The effective income tax rate for the three months ended September 30, 2021, was higher than the statutory rate due to a $1.2 million valuation allowance recorded during the period related to various state deferred tax assets and earnings in jurisdictions with higher income tax rates than the United States. The effective income tax rate for the three months ended September 30, 2020 approximated the statutory rate, as the favorable impact of the CARES Act was offset by the unfavorable impact of taxes in other jurisdictions and other permanent book to tax differences. The effective income tax rate for the nine months ended September 30, 2021 was higher than the statutory rate due to a $1.2 million valuation allowance recorded during the period which was related to various state deferred tax assets offset by the capitalization of certain non-US intercompany balances which resulted in a deductible foreign exchange loss in the US. The effective income tax rate for the nine months ended September 30, 2020 was lower than the statutory rate primarily due to the income tax benefits of the CARES Act, partially offset by impairments for which the Company did not realize income tax benefits. Recent Accounting Pronouncements On January 1, 2021, the Company adopted new guidance to simplify the accounting for income taxes by, among other things, removing certain exceptions related to intra-period tax allocations, interim calculations and the recognition of deferred tax liabilities for outside basis differences. The guidance did not have a material impact on the Company's consolidated financial statements. In March 2020 and updated in January 2021, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” The amendments provide optional guidance for a limited period of time to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform on financial reporting. The guidance provides optional expedients and exceptions for applying U.S. GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another rate that is expected to be discontinued. The amendments in ASU 2020-04 are effective for all entities as of March 12, 2020 through December 31, 2022. The Company is currently evaluating applicable contracts and the available expedients provided by the new guidance.

Mistras Group, Inc. and subsidiaries (the Company) is a leading “one source” multinational provider of integrated technology-enabled asset protection solutions helping to maximize the safety and operational uptime for civilization's most critical industrial and civil assets.

Backed by an innovative, data-driven asset protection portfolio, proprietary technologies, and decades-long legacy of industry leadership, the Company helps clients with asset-intensive infrastructure in the oil and gas, aerospace and defense, industrials, power generation and transmission (including alternative and renewable energy), other process industries and infrastructure, research and engineering and other industries towards achieving and maintaining operational excellence. By supporting these organizations that help fuel our vehicles and power our society; inspecting components that are trusted for commercial, defense, and space craft; and building real-time monitoring equipment to enable safe travel across bridges, the Company helps the world at large.

The Company enhances value for its clients by integrating asset protection throughout supply chains and centralizing integrity data through a suite of Industrial IoT-connected digital software and monitoring solutions, including OneSuite™, which serves as an ecosystem platform, pulling together all of the Company’s software and data services capabilities, for the benefit of its customers.

The Company's core capabilities also include non-destructive testing (“NDT”) field inspections enhanced by advanced robotics, laboratory quality control and assurance testing, sensing technologies and NDT equipment, asset and mechanical integrity engineering services, and light mechanical maintenance and access services.

The COVID-19 coronavirus (COVID-19) pandemic has continued to cause disruption and volatility in domestic and international markets and conditions continue to improve during 2021 as compared to 2020. The Company's businesses have been classified as non-healthcare critical infrastructure as defined by the U.S. Centers for Disease Control and Prevention (CDC). Our facilities, and the Company's customers facilities as well, have remained open with staffing modifications and precautionary procedures taken as necessary.

Overall, the Company has taken actions to help ensure the health and safety of Company employees and those of its customers and suppliers; maintain business continuity and financial strength and stability; and serve customers as they provide essential products and services to the world.

The COVID-19 pandemic uncertainty, significant volatility in oil prices, and decreased traffic in the aerospace industry have adversely affected the operations of the Company's customers, suppliers and contractors beginning in the first quarter of 2020, and as a consequence, the Company's results of operations were adversely impacted. These negative factors continue to cause volatility and uncertainty in the markets in which the Company operates, although the Company in 2021 has nevertheless begun approaching pre-pandemic levels of activity in certain end markets, particularly oil and gas where crude oil prices have exceeded pre-pandemic levels.

While the Company cannot fully assess the impact that the factors discussed above will have on its operations at this time, there were certain impacts that the Company identified resulting in impairment charges in 2020. See Note 8-Goodwill, Note 9-Intangible Assets and Note 13-Leases for additional information.

The Company has eliminated substantially all of the cost reduction initiatives undertaken in 2020, including re-installment of the savings plan employer match and increasing wages back to pre-pandemic amounts.

The Company is currently unable to predict with certainty the overall impact that the factors discussed above may have on its business, results of operations or liquidity or in other ways which the Company cannot yet determine. The Company will

The Unaudited Condensed Consolidated Financial Statements contained in this report have been prepared in conformity with U.S. generally accepted accounting principles ("GAAP") and Securities and Exchange Commission guidance allowing for reduced disclosure for interim periods. In the opinion of management, the Unaudited Condensed Consolidated Financial Statements include all adjustments, which are of a normal recurring nature, necessary for a fair presentation of the results for the interim periods of the years ending December 31, 2021 and December 31, 2020.

Certain items included in these statements are based on management’s estimates. Actual results may differ from those estimates. The results of operations for any interim period are not necessarily indicative of the results expected for the year. The accompanying Unaudited Condensed Consolidated Financial Statements should be read in conjunction with the notes to the Audited Consolidated Financial Statements contained in the Company's 2020 Annual Report on Form 10-K ("2020 Annual Report").

The accompanying Unaudited Condensed Consolidated Financial Statements include the accounts of Mistras Group, Inc. as well as its wholly-owned subsidiaries, majority-owned subsidiaries and consolidated variable interest entities (VIE). For subsidiaries in which the Company’s ownership interest is less than 100%, the non-controlling interests are reported in stockholders’ equity in the accompanying Condensed Consolidated Balance Sheets. The non-controlling interests in net results, net of tax, is classified separately in the accompanying Unaudited Condensed Consolidated Statements of Income (Loss). All significant intercompany accounts and transactions have been eliminated in consolidation. The results of operations of companies acquired are included from the date of acquisition.

Certain amounts in prior periods have been reclassified to conform to the current year presentation. Such reclassifications did not have a material effect on the Company's financial condition or results of operations as previously reported.

The Company’s significant accounting policies are disclosed in Note 1–Summary of Significant Accounting Policies and Practices in the 2020 Annual Report. On an ongoing basis, the Company evaluates its estimates and assumptions, including among other things, those related to revenue recognition, long-lived assets, goodwill and acquisitions. Since the date of the 2020 Annual Report, there have been no material changes to the Company's significant accounting policies.

Income taxes are accounted for under the asset and liability method. We recognize deferred tax assets and liabilities at enacted income tax rates for the temporary differences between the financial reporting bases and the tax bases of our assets and liabilities. Any effects of changes in income tax rates or tax laws are included in the provision for income taxes in the period of enactment. Our net deferred tax assets primarily consist of net operating loss carry forwards, or NOLs. A valuation allowance is provided if it is more likely than not that some or all of a deferred income tax asset will not be realized. A current tax liability or asset is recognized for the estimated taxes payable or refundable on tax returns for the current and prior years.

We recognize the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the financial statements from such a position are measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate resolution.

The Company’s effective income tax rate was approximately 50.8% and 25.9% for the three months ended September 30, 2021 and 2020, respectively. The Company’s effective income tax rate was approximately 44.4% and 13.6% for the nine months ended September 30, 2021 and 2020, respectively.

The effective income tax rate for the three months ended September 30, 2021, was higher than the statutory rate due to a $1.2 million valuation allowance recorded during the period related to various state deferred tax assets and earnings in jurisdictions with higher income tax rates than the United States. The effective income tax rate for the three months ended September 30, 2020 approximated the statutory rate, as the favorable impact of the CARES Act was offset by the unfavorable impact of taxes in other jurisdictions and other permanent book to tax differences.

The effective income tax rate for the nine months ended September 30, 2021 was higher than the statutory rate due to a $1.2 million valuation allowance recorded during the period which was related to various state deferred tax assets offset by the capitalization of certain non-US intercompany balances which resulted in a deductible foreign exchange loss in the US. The effective income tax rate for the nine months ended September 30, 2020 was lower than the statutory rate primarily due to the income tax benefits of the CARES Act, partially offset by impairments for which the Company did not realize income tax benefits.

On January 1, 2021, the Company adopted new guidance to simplify the accounting for income taxes by, among other things, removing certain exceptions related to intra-period tax allocations, interim calculations and the recognition of deferred tax liabilities for outside basis differences. The guidance did not have a material impact on the Company's consolidated financial statements.

In March 2020 and updated in January 2021, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” The amendments provide optional guidance for a limited period of time to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform on financial reporting. The guidance provides optional expedients and exceptions for applying U.S. GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another rate that is expected to be discontinued. The amendments in ASU 2020-04 are effective for all entities as of March 12, 2020 through December 31, 2022. The Company is currently evaluating applicable contracts and the available expedients provided by the new guidance.