Summary of Significant Accounting Policies	6 Months Ended
Jun. 30, 2014
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statements. The year-end condensed balance sheet data was derived from audited financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America. In the opinion of management, all adjustments considered necessary for a fair representation have been included. Operating results for the six months ended June 30, 2014 are not necessarily indicative of the results that may be expected for the year ending December 31, 2014. These financial statements should be read in conjunction with the consolidated financial statements and accompanying footnotes included in the Annual Report on Form 10-K of LMI Aerospace, Inc. (the "Company”) for the year ended December 31, 2013, as filed with the Securities and Exchange Commission. Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make certain estimates and assumptions. These estimates and assumptions affect the reported amounts in the financial statements and accompanying notes. Actual results could differ from these estimates. Reclassification Certain reclassifications have been made to prior period data within the footnotes in order to conform to current period presentation. Recent Accounting Standards In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (Topic 606). The standard is effective for reporting periods beginning after December 15, 2016 and early adoption is not permitted. The standard will supersede existing revenue recognition guidance, including industry-specific guidance, and will provide companies with a single revenue recognition model for recognizing revenue from contracts with customers. The standard requires revenue to be recognized when promised goods or services are transferred to customers in amounts that reflect the consideration to which the company expects to be entitled in exchange for those goods or services. Adoption of the new rules could affect the timing of revenue recognition for certain transactions. The two permitted transition methods under the new standard are the full retrospective method, in which case the standard would be applied to each prior reporting period presented, or the modified retrospective method, in which case the cumulative effect of applying the standard would be recognized at the date of initial application. The provisions of this new guidance are effective as of the beginning of the Company’s first quarter of 2017. The Company is currently evaluating the transition method to be used and the impact of adoption of this standard on its consolidated financial statements. In April 2014, the FASB issued ASU 2014-08, "Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity." The amendments in this update change the requirements for reporting discontinued operations. A discontinued operation may include a component of an entity or a group of components of an entity, or a business or nonprofit activity. A disposal of a component of an entity or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a strategic shift that has (or will have) a major effect on an entity's operations and financial results and when the component or group of components meets the criteria to be classified as held for sale, is disposed by sale or is disposed of by other than by sale (for example, by abandonment or in a distribution to owners in a spinoff). ASU 2014-8 is effective prospectively for fiscal years, and interim reporting periods within those years, beginning after December 15, 2014. The Company has no present activity that would be impacted by this new standard.

Summary of Significant Accounting Policies

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statements. The year-end condensed balance sheet data was derived from audited financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America. In the opinion of management, all adjustments considered necessary for a fair representation have been included. Operating results for the six months ended June 30, 2014 are not necessarily indicative of the results that may be expected for the year ending December 31, 2014. These financial statements should be read in conjunction with the consolidated financial statements and accompanying footnotes included in the Annual Report on Form 10-K of LMI Aerospace, Inc. (the "Company”) for the year ended December 31, 2013, as filed with the Securities and Exchange Commission.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make certain estimates and assumptions. These estimates and assumptions affect the reported amounts in the financial statements and accompanying notes. Actual results could differ from these estimates.

Reclassification

Certain reclassifications have been made to prior period data within the footnotes in order to conform to current period presentation.

Recent Accounting Standards

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (Topic 606). The standard is effective for reporting periods beginning after December 15, 2016 and early adoption is not permitted. The standard will supersede existing revenue recognition guidance, including industry-specific guidance, and will provide companies with a single revenue recognition model for recognizing revenue from contracts with customers. The standard requires revenue to be recognized when promised goods or services are transferred to customers in amounts that reflect the consideration to which the company expects to be entitled in exchange for those goods or services. Adoption of the new rules could affect the timing of revenue recognition for certain transactions. The two permitted transition methods under the new standard are the full retrospective method, in which case the standard would be applied to each prior reporting period presented, or the modified retrospective method, in which case the cumulative effect of applying the standard would be recognized at the date of initial application. The provisions of this new guidance are effective as of the beginning of the Company’s first quarter of 2017. The Company is currently evaluating the transition method to be used and the impact of adoption of this standard on its consolidated financial statements.

In April 2014, the FASB issued ASU 2014-08, "Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity." The amendments in this update change the requirements for reporting discontinued operations. A discontinued operation may include a component of an entity or a group of components of an entity, or a business or nonprofit activity. A disposal of a component of an entity or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a strategic shift that has (or will have) a major effect on an entity's operations and financial results and when the component or group of components meets the criteria to be classified as held for sale, is disposed by sale or is disposed of by other than by sale (for example, by abandonment or in a distribution to owners in a spinoff). ASU 2014-8 is effective prospectively for fiscal years, and interim reporting periods within those years, beginning after December 15, 2014. The Company has no present activity that would be impacted by this new standard.