Description of Business and Basis of Presentation	3 Months Ended
Mar. 31, 2015
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., its subsidiaries and affiliates (hereafter collectively referred to as “Orion” or the “Company”) provide a broad range of heavy civil marine construction and specialty services on, over and under the water in the continental United States and Alaska, Canada and the Caribbean Basin and act as a single source turn-key solution for our customers' marine contracting needs. Our heavy civil marine construction services include marine transportation facility construction, marine pipeline construction, construction of marine environmental structures, dredging of waterways, channels and ports, environmental dredging, and specialty services. 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 areas in which we operate, we have concluded that our operations currently 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 the similar economic characteristics of our operations. The methods used, and the internal processes employed to deliver our heavy civil marine construction services are similar throughout our business, including standardized estimating, project controls and project management. We have the same customers with similar funding drivers throughout our business, and we comply with regulatory environments 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 the U.S. Occupational Safety and Health Administration, among others. Additionally, our business is driven by macro-economic considerations including 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 our business. The tools used by our chief operating decision maker to allocate resources and assess performance are based on our business of heavy civil marine construction. Basis of Presentation The accompanying condensed consolidated financial statements and financial information included herein have been prepared pursuant to the interim period reporting requirements of Form 10-Q. Consequently, certain information and note disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States have been condensed or omitted. Readers of this report should also read our consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2014 (“2014 Form 10-K”) as well as Item 7 – Management’s Discussion and Analysis of Financial Condition and Results of Operations also included in our 2014 Form 10-K. In the opinion of management, the accompanying unaudited condensed consolidated financial statements contain all adjustments considered necessary for a fair presentation of the Company’s financial position, results of operations and cash flows for the periods presented. Such adjustments are of a normal recurring nature. Interim results of operations for the three months ended March 31, 2015 are not necessarily indicative of the results that may be expected for the year ending December 31, 2015.

Description of Business and Basis of Presentation

Description of Business

Orion Marine Group, Inc., its subsidiaries and affiliates (hereafter collectively referred to as “Orion” or the “Company”) provide a broad range of heavy civil marine construction and specialty services on, over and under the water in the continental United States and Alaska, Canada and the Caribbean Basin and act as a single source turn-key solution for our customers' marine contracting needs. Our heavy civil marine construction services include marine transportation facility construction, marine pipeline construction, construction of marine environmental structures, dredging of waterways, channels and ports, environmental dredging, and specialty services. 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 areas in which we operate, we have concluded that our operations currently 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 the similar economic characteristics of our operations. The methods used, and the internal processes employed to deliver our heavy civil marine construction services are similar throughout our business, including standardized estimating, project controls and project management. We have the same customers with similar funding drivers throughout our business, and we comply with regulatory environments 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 the U.S. Occupational Safety and Health Administration, among others. Additionally, our business is driven by macro-economic considerations including 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 our business. The tools used by our chief operating decision maker to allocate resources and assess performance are based on our business of heavy civil marine construction.

Basis of Presentation

The accompanying condensed consolidated financial statements and financial information included herein have been prepared pursuant to the interim period reporting requirements of Form 10-Q. Consequently, certain information and note disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States have been condensed or omitted. Readers of this report should also read our consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2014 (“2014 Form 10-K”) as well as Item 7 – Management’s Discussion and Analysis of Financial Condition and Results of Operations also included in our 2014 Form 10-K.

In the opinion of management, the accompanying unaudited condensed consolidated financial statements contain all adjustments considered necessary for a fair presentation of the Company’s financial position, results of operations and cash flows for the periods presented. Such adjustments are of a normal recurring nature. Interim results of operations for the three months ended March 31, 2015 are not necessarily indicative of the results that may be expected for the year ending December 31, 2015.