Description of Business and Basis of Presentation	12 Months Ended
Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Basis of Presentation	1.Description of Business and Basis of Presentation Description of Business Orion Group Holdings, Inc., its subsidiaries and affiliates (hereafter collectively referred to as the “Company”), provide a broad range of specialty construction services in the infrastructure, industrial, and building sectors of the continental United States, Alaska, Canada and the Caribbean Basin. The Company’s marine segment services the infrastructure sector through marine transportation facility construction, marine pipeline construction, marine environmental structures, dredging of waterways, channels and ports, environmental dredging, design, and specialty services. Its concrete segment services the building sector by providing turnkey concrete construction services including place and finish, site preparation, layout, forming, and rebar placement for large commercial, structural and other associated business areas. The Company is headquartered in Houston, Texas with offices throughout its operating areas. The tools used by the chief operating decision maker (“CODM”) to allocate resources and assess performance are based on two reportable and operating segments: marine, which operates under the Orion brand and logo, and concrete, which operates under the TAS Commercial Concrete brand and logo. Although we describe the business in this report in terms of the services the Company provides, its base of customers and the areas in which it operates, the Company has determined that its operations currently comprise two reportable segments pursuant to Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 280, Segment Reporting. In making this determination, the Company considered the similar economic characteristics of its operations that comprise its marine segment. For the marine segment, the methods used, and the internal processes employed, to deliver marine construction services are similar throughout the segment, including standardized estimating, project controls and project management. This segment has the same customers with similar funding drivers and are subject to similar regulatory regimes driven through Federal agencies such as the U.S. Army Corps of Engineers, U.S. Fish and Wildlife Service, U.S. Environmental Protection Agency and U.S. Occupational Safety and Health Administration (“OSHA”), among others. Additionally, the segment is driven by macro-economic considerations including the level of import/export seaborne transportation, development of energy-related infrastructure, cruise line expansion and operations, marine bridge infrastructure development, waterway pipeline crossings and the maintenance of waterways. These considerations, and others, are key catalysts for future prospects and are similar across the segment. For the concrete segment, the Company also considered the similar economic characteristics of these operations. The methods used, and the internal processes employed, to deliver concrete construction services are similar throughout the segment, including standardized estimating, project controls and project management. The projects of this segment are subject to similar regulatory regimes such as OSHA. Additionally, this segment is driven by macro-economic considerations, including movements in population, commercial real estate development, institutional funding and expansion, and recreational development, specifically in metropolitan areas of Texas. These considerations, and others, are key catalysts for current operations and future prospects and are similar across the segment. Basis of Presentation These consolidated financial statements include the accounts of the parent company, Orion Group Holdings, Inc. and its wholly-owned subsidiaries and have been prepared in accordance with U.S. GAAP on the going concern basis of accounting, which assumes the Company will continue to operate as a going concern and which contemplates the realization of assets and the satisfaction of liabilities and commitments in the normal course of business. All intercompany balances and transactions have been eliminated in consolidation. In connection with preparing consolidated financial statements for each annual and interim reporting period, the Company is required to evaluate whether there are conditions or events, considered in aggregate, that raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date that the financial statements are issued. Substantial doubt exists when conditions and events, considered in aggregate, indicate that it is probable that a company will be unable to meet its obligations as they become due within one year after the date that the consolidated financial statements are issued. This evaluation initially does not take into consideration the potential mitigating effect of management’s plans and actions that have not been fully implemented as of the date that the financial statements are issued. When substantial doubt exists, management evaluates whether the mitigating effect of its plans sufficiently alleviates substantial doubt about the Company’s ability to continue as a going concern. The mitigating effect of management’s plans, however, is only considered if both: (1) it is probable that the plans will be effectively implemented within one year after the date that the financial statements are issued; and (2) it is probable that the plans, when implemented, will mitigate the relevant conditions or events that raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date that the financial statements are issued. Generally, to be considered probable of being effectively implemented, the plans must have been approved before the date that the financial statements are issued. The Company has sustained operating losses for the years ended December 31, 2022 and 2021. The assessment of the liquidity and going concern requires the Company to make estimates of future activity and judgments about whether the Company is compliant with financial covenant calculations under its debt and other agreements and has adequate liquidity to operate. Significant assumptions used in the Company's forecasted model of liquidity include forecasted sales, costs, and capital expenditures; expected timing and proceeds of planned real estate transactions. Also as described in Note 11, the Company had $35.0 million of outstanding indebtedness under its Credit Facility as of December 31, 2022 which matures on July 31, 2023. As of the date of these financial statements, the Company’s existing cash and cash equivalents are not sufficient to satisfy the Company’s operating cash needs for at least one year after the issuance of these financial statements. To alleviate these conditions, the Company is engaged in a syndication process to refinance the outstanding debt. Based on the advanced nature of our discussions, the completion of substantial due diligence by potential lenders, agreement among the parties on key terms of a new credit facility, and the expected timeline for documentation and execution of a new credit agreement, Management believes it will successfully complete a refinancing transaction prior to the maturity of the current credit facility. Additionally, the Company is exploring sales of underutilized assets as a source of liquidity. The Company’s ability to continue as a going concern is dependent upon obtaining sufficient liquidity to repay its existing credit facility through a combination of proceeds from new debt, proceeds from the sale of underutilized assets, and operating cash flow. As the Company’s refinancing activities are ongoing, there can be no assurances that the Company will be able to secure financing on terms that are acceptable to the Company or at all. These conditions raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date the financial statements are issued. While management has developed and is in process to implement plans that management believes could alleviate in the future the substantial doubt that was raised, management concluded at the date of the issuance of the financial statements that substantial doubt exists as those plans are not within the control of management. The Company’s consolidated financial statements do not include adjustments, if any, that may arise from the outcome of this uncertainty. There is an explanatory paragraph included in the report of the Company’s independent registered public accounting firm describing the uncertainty about the Company’s ability to continue as a going concern, which is considered an event of noncompliance under the Company’s Credit Facility. Management has obtained a consent with respect to the delivery of annual financial statements with an audit opinion unqualified as to going concern from the Credit Facility lenders, and the Company is compliant with the financial covenants of the credit agreement.

Description of Business and Basis of Presentation

12 Months Ended

Dec. 31, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Description of Business and Basis of Presentation

1.Description of Business and Basis of Presentation

Description of Business

Orion Group Holdings, Inc., its subsidiaries and affiliates (hereafter collectively referred to as the “Company”), provide a broad range of specialty construction services in the infrastructure, industrial, and building sectors of the continental United States, Alaska, Canada and the Caribbean Basin. The Company’s marine segment services the infrastructure sector through marine transportation facility construction, marine pipeline construction, marine environmental structures, dredging of waterways, channels and ports, environmental dredging, design, and specialty services. Its concrete segment services the building sector by providing turnkey concrete construction services including place and finish, site preparation, layout, forming, and rebar placement for large commercial, structural and other associated business areas. The Company is headquartered in Houston, Texas with offices throughout its operating areas.

The tools used by the chief operating decision maker (“CODM”) to allocate resources and assess performance are based on two reportable and operating segments: marine, which operates under the Orion brand and logo, and concrete, which operates under the TAS Commercial Concrete brand and logo.

Although we describe the business in this report in terms of the services the Company provides, its base of customers and the areas in which it operates, the Company has determined that its operations currently comprise two reportable segments pursuant to Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 280, Segment Reporting.

In making this determination, the Company considered the similar economic characteristics of its operations that comprise its marine segment. For the marine segment, the methods used, and the internal processes employed, to deliver marine construction services are similar throughout the segment, including standardized estimating, project controls and project management. This segment has the same customers with similar funding drivers and are subject to similar regulatory regimes driven through Federal agencies such as the U.S. Army Corps of Engineers, U.S. Fish and Wildlife Service, U.S. Environmental Protection Agency and U.S. Occupational Safety and Health Administration (“OSHA”), among others. Additionally, the segment is driven by macro-economic considerations including the level of import/export seaborne transportation, development of energy-related infrastructure, cruise line expansion and operations, marine bridge infrastructure development, waterway pipeline crossings and the maintenance of waterways. These considerations, and others, are key catalysts for future prospects and are similar across the segment.

For the concrete segment, the Company also considered the similar economic characteristics of these operations. The methods used, and the internal processes employed, to deliver concrete construction services are similar throughout the segment, including standardized estimating, project controls and project management. The projects of this segment are subject to similar regulatory regimes such as OSHA. Additionally, this segment is driven by macro-economic considerations, including movements in population, commercial real estate development, institutional funding and expansion, and recreational development, specifically in metropolitan areas of Texas. These considerations, and others, are key catalysts for current operations and future prospects and are similar across the segment.

Basis of Presentation

These consolidated financial statements include the accounts of the parent company, Orion Group Holdings, Inc. and its wholly-owned subsidiaries and have been prepared in accordance with U.S. GAAP on the going concern basis of accounting, which assumes the Company will continue to operate as a going concern and which contemplates the realization of assets and the satisfaction of liabilities and commitments in the normal course of business. All intercompany balances and transactions have been eliminated in consolidation.

In connection with preparing consolidated financial statements for each annual and interim reporting period, the Company is required to evaluate whether there are conditions or events, considered in aggregate, that raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date that the financial statements are issued. Substantial doubt exists when conditions and events, considered in aggregate, indicate that it is probable that a company will be unable to meet its obligations as they become due within one year after the date that the consolidated financial

statements are issued. This evaluation initially does not take into consideration the potential mitigating effect of management’s plans and actions that have not been fully implemented as of the date that the financial statements are issued. When substantial doubt exists, management evaluates whether the mitigating effect of its plans sufficiently alleviates substantial doubt about the Company’s ability to continue as a going concern. The mitigating effect of management’s plans, however, is only considered if both: (1) it is probable that the plans will be effectively implemented within one year after the date that the financial statements are issued; and (2) it is probable that the plans, when implemented, will mitigate the relevant conditions or events that raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date that the financial statements are issued. Generally, to be considered probable of being effectively implemented, the plans must have been approved before the date that the financial statements are issued.

The Company has sustained operating losses for the years ended December 31, 2022 and 2021. The assessment of the liquidity and going concern requires the Company to make estimates of future activity and judgments about whether the Company is compliant with financial covenant calculations under its debt and other agreements and has adequate liquidity to operate. Significant assumptions used in the Company's forecasted model of liquidity include forecasted sales, costs, and capital expenditures; expected timing and proceeds of planned real estate transactions. Also as described in Note 11, the Company had $35.0 million of outstanding indebtedness under its Credit Facility as of December 31, 2022 which matures on July 31, 2023. As of the date of these financial statements, the Company’s existing cash and cash equivalents are not sufficient to satisfy the Company’s operating cash needs for at least one year after the issuance of these financial statements.

To alleviate these conditions, the Company is engaged in a syndication process to refinance the outstanding debt. Based on the advanced nature of our discussions, the completion of substantial due diligence by potential lenders, agreement among the parties on key terms of a new credit facility, and the expected timeline for documentation and execution of a new credit agreement, Management believes it will successfully complete a refinancing transaction prior to the maturity of the current credit facility. Additionally, the Company is exploring sales of underutilized assets as a source of liquidity.

The Company’s ability to continue as a going concern is dependent upon obtaining sufficient liquidity to repay its existing credit facility through a combination of proceeds from new debt, proceeds from the sale of underutilized assets, and operating cash flow. As the Company’s refinancing activities are ongoing, there can be no assurances that the Company will be able to secure financing on terms that are acceptable to the Company or at all.

These conditions raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date the financial statements are issued. While management has developed and is in process to implement plans that management believes could alleviate in the future the substantial doubt that was raised, management concluded at the date of the issuance of the financial statements that substantial doubt exists as those plans are not within the control of management. The Company’s consolidated financial statements do not include adjustments, if any, that may arise from the outcome of this uncertainty.

There is an explanatory paragraph included in the report of the Company’s independent registered public accounting firm describing the uncertainty about the Company’s ability to continue as a going concern, which is considered an event of noncompliance under the Company’s Credit Facility. Management has obtained a consent with respect to the delivery of annual financial statements with an audit opinion unqualified as to going concern from the Credit Facility lenders, and the Company is compliant with the financial covenants of the credit agreement.