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Description of Business and Basis of Presentation	12 Months Ended
Description of Business and Basis of Presentation	Dec. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Basis of Presentation	Description of Business and Basis of Presentation Description of Business Orion Marine Group, Inc. and its subsidiaries (hereafter collectively referred to as “Orion” or the “Company”) provide a broad range of marine construction services on, over and under the water along the Gulf Coast, the Atlantic Seaboard, the West Coast, Alaska, Canada and in the Caribbean Basin. Our heavy civil marine projects include marine transportation facilities; bridges and causeways; marine pipelines; mechanical and hydraulic dredging and specialty projects. We are headquartered in Houston, Texas. Although we describe our business in this report in terms of the services we provide, our base of customers and the geographic areas in which we operate, we have concluded that our operations comprise one reportable segment pursuant to Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 280 – Segment Reporting. In making this determination, we considered that each project has similar characteristics, includes similar services, has similar types of customers and is subject to the same regulatory environment. We organize, evaluate and manage our financial information around each project when making operating decisions and assessing our overall performance. Basis of Presentation These consolidated financial statements include the accounts of the parent company, Orion Marine Group, Inc. and its wholly-owned subsidiaries and have been prepared in accordance with accounting principles generally accepted in the United States of America. All significant intercompany balances and transactions have been eliminated in consolidation. Reclassifications The gain or loss on sale of assets in the prior year periods has been reclassified to conform to current year presentation in Other Income/Expense.