General (Policy)	3 Months Ended
General (Policy)	Mar. 31, 2012
General [Abstract]
Consolidation And Basis Of Presentation	*Consolidation and Basis of Presentation* The condensed consolidated financial statements include the accounts of Mercury General Corporation and its subsidiaries (referred to herein collectively as the Company). For the list of the Company's subsidiaries, see Note 1 "Summary of Significant Accounting Policies" of the Notes to Consolidated Financial Statements in the Company's Annual Report on Form 10-K for the year ended December 31, 2011. The condensed consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles ("GAAP"), which differ in some respects from those filed in reports to insurance regulatory authorities. All intercompany transactions and balances have been eliminated. The financial data of the Company included herein has been prepared without audit. In the opinion of management, all material adjustments of a normal recurring nature have been made to present fairly the Company's financial position at March 31, 2012 and the results of operations, comprehensive income, and cash flows for the periods presented. Operating results and cash flows for the three months ended March 31, 2012 are not necessarily indicative of the results that may be expected for the year ending December 31, 2012.
Use Of Estimates	*Use of Estimates* The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. These estimates require the Company to apply complex assumptions and judgments, and often the Company must make estimates about effects of matters that are inherently uncertain and will likely change in subsequent periods. The most significant assumptions in the preparation of these consolidated financial statements relate to reserves for losses and loss adjustment expenses. Actual results could differ from those estimates (See Note 1 "Summary of Significant Accounting Policies" of the Notes to Consolidated Financial Statements in the Company's Annual Report on Form 10-K for the year ended December 31, 2011).
Earnings Per Share	*Earnings per Share* Potentially dilutive securities representing approximately 62,000 and 102,000 shares of common stock for the three months ended March 31, 2012 and 2011, respectively, were excluded from the computation of diluted earnings per common share for these periods because their effect would have been anti-dilutive.
Deferred Policy Acquisition Costs	*Deferred Policy Acquisition Costs* In October 2010, the Financial Accounting Standards Board ("FASB") issued a new standard to address diversity in practice regarding the interpretation of which costs relating to the acquisition of new or renewal insurance contracts qualify for deferral. The new standard defines acquisition costs as those related directly to the successful acquisition of new or renewal insurance contracts. The Company adopted the new standard using the prospective method. Deferred policy acquisition costs consist of commissions paid to outside agents, premium taxes, salaries, and certain other underwriting costs that are incremental or directly related to the successful acquisition of new and renewal insurance contracts and are amortized over the life of the related policy in proportion to premiums earned. Deferred policy acquisition costs are limited to the amount that will remain after deducting from unearned premiums and anticipated investment income, the estimated losses and loss adjustment expenses, and the servicing costs that will be incurred as premiums are earned. Under the new standard, the Company's deferred policy acquisition costs are further limited by excluding those costs not directly related to the successful acquisition of insurance contracts. As of March 31, 2012, deferred policy acquisition costs were $175.4 million, but would have been $176.6 million had the previous policy been applied. Deferred policy acquisition cost amortization was $117.4 million and $121.8 million for the three months ended March 31, 2012 and 2011, respectively. The Company does not defer advertising expenses but expenses them as incurred. The Company recorded net advertising expenses of approximately $5 million and $6 million for the three months ended March 31, 2012 and 2011, respectively.

Disclosure of accounting policy for deferred policy acquisition costs, including the nature, type, and amount of capitalized costs incurred to write or acquire insurance contracts, and the basis for and methodologies applied in capitalizing and amortizing such costs.

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- Definition

Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.

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- Definition

Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.

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