Description of Business and Basis of Presentation	12 Months Ended
Dec. 31, 2023
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. and subsidiaries, (hereafter collectively referred to as the “Company”), is a leading specialty construction company serving the infrastructure, industrial, and building sectors, providing services both on and off the water in the continental United States, Alaska, Hawaii, Canada and the Caribbean Basin through its marine segment and its concrete segment. Our marine segment provides construction and dredging services including marine transportation facility construction, marine pipeline construction, marine environmental structures construction, dredging of waterways, channels and ports, environmental dredging, design, and specialty services related to marine construction, fabrication, and dredging. Our concrete segment provides turnkey concrete construction services including concrete surface place and finish, site preparation, layout, forming, and rebar placement for large commercial, structural and other associated business areas. We are headquartered in Houston, Texas with regional offices throughout our operating areas. 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. 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 and concrete, which operate under the Orion brand and logo. 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 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 and expected timing and proceeds of planned real estate transactions. The Company has sustained operating losses for the years ended December 31, 2023, 2022 and 2021. Also as described in Note 10, the Company had $35.0 million of outstanding indebtedness under its prior credit facility as of December 31, 2022 which was scheduled to mature on July 31, 2023. As of the date of the filing of the Company’s 2022 Form 10-K on March 16, 2023, the Company’s existing cash and cash equivalents were not sufficient to satisfy the Company’s operating cash needs for at least one year after the issuance of the financial statements. These conditions raised substantial doubt about the Company’s ability to continue as a going concern within one year after the date the financial statements were issued. As such, management concluded at the date of the issuance of the financial statements included in the Company’s 2022 Form 10-K that substantial doubt existed as to going concern. At the beginning of 2023, the Company began a process to refinance the outstanding debt. On May 15, 2023, the Company entered into a new three-year $103.0 million senior secured credit facility (the “Credit Agreement”) with White Oak ABL, LLC and White Oak Commercial Finance, LLC (collectively, “White Oak”) which includes a $65.0 million asset based revolving credit facility (the “Revolver”) and a $38.0 million fixed asset term loan (the “Term Loan”). See Note 10 for more information regarding the debt refinancing. Based on an assessment of the completion of the debt refinancing process and the other factors above, management believes that the Company will have adequate liquidity for its operations for at least the next 12 months. Therefore, management’s conclusion is that the conditions that previously raised substantial doubt have been resolved and substantial doubt is no longer raised as to the Company’s ability to continue as a going concern.

Description of Business and Basis of Presentation

12 Months Ended

Dec. 31, 2023

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. and subsidiaries, (hereafter collectively referred to as the “Company”), is a leading specialty construction company serving the infrastructure, industrial, and building sectors, providing services both on and off the water in the continental United States, Alaska, Hawaii, Canada and the Caribbean Basin through its marine segment and its concrete segment. Our marine segment provides construction and dredging services including marine transportation facility construction, marine pipeline construction, marine environmental structures construction, dredging of waterways, channels and ports, environmental dredging, design, and specialty services related to marine construction, fabrication, and dredging. Our concrete segment provides turnkey concrete construction services including concrete surface place and finish, site preparation, layout, forming, and rebar placement for large commercial, structural and other associated business areas. We are headquartered in Houston, Texas with regional offices throughout our operating areas.

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.

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 and concrete, which operate under the Orion brand and logo.

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 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 and expected timing and proceeds of planned real estate transactions. The Company has sustained operating losses for the years ended December 31, 2023, 2022 and 2021. Also as described in Note 10, the Company had $35.0 million of outstanding indebtedness under its prior credit facility as of December 31, 2022 which was scheduled to mature on July 31, 2023. As of the date of the filing of the Company’s 2022 Form 10-K on March 16, 2023, the Company’s existing cash and cash equivalents were not sufficient to satisfy the Company’s operating cash needs for at least one year after the issuance of the financial statements. These conditions raised substantial doubt about the Company’s ability to continue as a going concern within one year after the date the financial statements were issued. As such, management concluded at the date of the issuance of the financial statements included in the Company’s 2022 Form 10-K that substantial doubt existed as to going concern.

At the beginning of 2023, the Company began a process to refinance the outstanding debt. On May 15, 2023, the Company entered into a new three-year $103.0 million senior secured credit facility (the “Credit Agreement”) with White Oak ABL, LLC and White Oak Commercial Finance, LLC (collectively, “White Oak”) which includes a $65.0 million asset based revolving credit facility (the “Revolver”) and a $38.0 million fixed asset term loan (the “Term Loan”). See Note 10 for more information regarding the debt refinancing.

Based on an assessment of the completion of the debt refinancing process and the other factors above, management believes that the Company will have adequate liquidity for its operations for at least the next 12 months. Therefore, management’s conclusion is that the conditions that previously raised substantial doubt have been resolved and substantial doubt is no longer raised as to the Company’s ability to continue as a going concern.