Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] 7.75% Senior Unsecured Notes Due 2031 7.75% Senior Unsecured Notes Due 2031 [Member] 7.75% Senior Unsecured Notes Due 2031 Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] AAA A A A Comparable Rating [Member] AAA comparable rating. 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Amendment Flag Amendment Flag Consolidated Entities [Axis] Consolidated Entities [Axis] Average Price per Share Repurchased (in USD per share) Shares Acquired, Average Cost Per Share Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding Less: Accumulated depreciation Real Estate Investment Property, Accumulated Depreciation Net investment income Net investment income Net Investment Income Effective Income Tax Rate Reconciliation, Percent Effective Income Tax Rate Reconciliation, Percent [Abstract] Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax INVESTMENTS Investment [Text Block] Mortgage-Backed and Asset-Backed Securities Asset-Backed Securities [Member] Investment in private equity limited partnership, financial information, delay period Alternative Investment, Financial Information, Delay Period Alternative Investment, Financial Information, Delay Period Schedule of Cost or Amortized Cost and Fair Value of Securities Available for Sale Debt Securities, Available-for-Sale [Table Text Block] Investments [Domain] Investments [Domain] Liability for Unpaid Claim and Claim Adjustment Expense, Change [Table] Liability for Unpaid Claim and Claim Adjustment Expense, Change [Table] Consolidated Entities [Domain] Consolidated Entities [Domain] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province Purchases of equity securities Payments to Acquire Equity Securities, FV-NI PEO Total Compensation Amount PEO Total Compensation Amount Common stock, par value (in USD per share) Common Stock, Par or Stated Value Per Share Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Member] Catastrophic Event [Domain] Catastrophic Event [Domain] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Weighted average common shares outstanding - Basic (in shares) Weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Direct premiums earned Direct premiums earned Direct Premiums Earned Gross realized gains on sale of securities, Other investments Realized Gains on Sale of Other Investments Realized Gains on Sale of Other Investments Schedule of Debt Securities, Available-for-sale, Allowance for Credit Loss Debt Securities, Available-for-Sale, Allowance for Credit Loss [Table Text Block] Investment real estate Real Estate Investment Property, at Cost Due after five years through ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Massachusetts MASSACHUSETTS Entity Address, City or Town Entity Address, City or Town Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Basis of Presentation and Consolidation Basis of Accounting, Policy [Policy Text Block] Preferred stock dividend Payments of Ordinary Dividends, Preferred Stock and Preference Stock Vesting of equity instruments other than options (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Debt issuance costs Debt Issuance Costs, Gross Income (loss) available to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Other Other than Securities Investment [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Advance premium Deposit Contracts, Liabilities Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Increases in net losses and LAE Increases in Net Losses and LAE [Member] Increases in Net Losses and LAE Incurred related to: Incurred Related To [Abstract] Incurred Related To Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] Ten percent of total liabilities Statutory Accounting Practices Ten Percent Of Statutory Liabilities Balance The ten percent of statutory liabilities as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country. 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Non-cash expense Amortization of Debt Issuance Costs Municipal Bonds Municipal Bonds [Member] Use of Estimates Use of Estimates, Policy [Policy Text Block] Unsecured Debt Unsecured Debt [Member] Other comprehensive income (loss), net of taxes Other comprehensive income (loss), net of taxes Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Debt, net of issuance costs Total debt, net Long-Term Debt External Credit Rating by Grouping [Domain] External Credit Rating by Grouping [Domain] Everest Reinsurance Co Everest Reinsurance Co [Member] Everest Reinsurance Co Due after one year through five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Document Period End Date Document Period End Date South Carolina SOUTH CAROLINA Net cash provided by (used in) investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Schedule of Prepaid Reinsurance Premiums and Reinsurance Recoverable and Receivable Schedule Of Reinsurance Recoverable [Table Text Block] Tabular disclosure of prepaid reinsurance premiums and reinsurance recoverable (payable) and receivable. Cumulative convertible preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Unsecured term loan agreement Debt Instrument, Face Amount STOCKHOLDERS’ EQUITY Equity [Text Block] Security Exchange Name Security Exchange Name Gross realized losses on sale of securities, Available-for-sale debt securities Debt Securities, Available-for-Sale, Realized Loss Treasury shares, at cost - 20,558 and 20,226, respectively Treasury Stock, Common, Value Effective interest rate (in percent) Debt Instrument, Interest Rate, Effective Percentage INSURANCE OPERATIONS Insurance Disclosure [Text Block] Fair Value, Inputs, Level 1, Level 2, and Level 3 Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Due after ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Agency Agency Securities [Member] Other comprehensive income (loss) Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Ceded Losses and Loss Adjustment Expenses Policyholder Benefits and Claims Incurred, Assumed and Ceded Vesting of equity instruments other than options Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Entity Shell Company Entity Shell Company 12 months or longer, Fair value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Schedule of Real Estate Investment Schedule of Real Estate Properties [Table Text Block] EARNINGS (LOSS) PER SHARE Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings Per Share [Abstract] Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total liabilities Liabilities Trading Symbol Trading Symbol % of Total Fair Value Fixed Maturities Fair Value Percentage Represents the amount of certain securities (as a percentage) out of total fixed maturities securities. Geographical [Domain] Geographical [Domain] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Renaissance Reinsurance Ltd. Renaissance Reinsurance Ltd [Member] Renaissance Reinsurance Ltd. Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Company Selected Measure Name Company Selected Measure Name Dividend paid to immediate parent company SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Consolidated Subsidiaries Purchases of available-for-sale debt securities Payments to Acquire Debt Securities, Available-for-Sale Less: Reclassification adjustments for (gains) losses realized in net income (loss) Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Less: Reclassification adjustments for (gains) losses realized in net income (loss) Reclassification from AOCI, Current Period, before Tax, Attributable to Parent Investment in private equity limited partnership, financial information, lag period Alternative Investment, Financial Information, Lag Period Alternative Investment, Financial Information, Lag Period Total principal amount Carrying Value Long-Term Debt, Gross U.S. government obligations and agencies U.S. government obligations and agencies US Government Corporations and Agencies Securities [Member] May 1, 2025 May Two Thousand Twenty Five Share Repurchase Program One [Member] May Two Thousand Twenty Five Share Repurchase Program One Equity securities, amortized cost Equity Securities, FV-NI, Cost Available-for-sale debt securities Debt Securities [Member] Credit Facility [Domain] Credit Facility [Domain] Asset Class [Domain] Asset Class [Domain] Unpaid losses and loss adjustment expenses Beginning balance Ending balance Liability for Claims and Claims Adjustment Expense Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Surplus note Surplus Note [Member] Surplus note assumed under a state or government sponsored program. 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Schedule of Beginning and Ending Balances and Changes in DPAC, Net of DRCC Deferred Policy Acquisition Costs [Table Text Block] Due in one year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Schedule of Reconciliation of Numerator and Denominator of Basic and Diluted Earnings (Loss) Per Share Computations Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Reinsurance recoverables Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments Capitalized Costs Deferred Policy Acquisition Cost, Capitalization SEGMENT INFORMATION Segment Reporting [Text Block] Maturities of available-for-sale debt securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Minimum Minimum [Member] Investment Type [Axis] Investment Type [Axis] Common stock dividend Payments of Ordinary Dividends, Common Stock Unfunded Commitments Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments Expiration Date Trading Arrangement Expiration Date VARIABLE INTEREST ENTITIES Variable Interest Entity Disclosure [Text Block] LIABILITIES: Liabilities [Abstract] Denominator for EPS: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Restricted cash and cash equivalents Restricted Cash and Cash Equivalent Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Non-agency Non Agency [Member] Securities issued by private non-government sponsored entities. Common stock, shares authorized (in shares) Common Stock, Shares Authorized Investment real estate, net Investment real estate, net Real Estate Investment Property, Net Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Gross realized gains on sale of securities, Available-for-sale debt securities Debt Securities, Available-for-Sale, Realized Gain Due after ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Exercise Price Award Exercise Price Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Dollar Amount Authorized Share Repurchase Program, Authorized, Amount Proceeds from sales and maturities (fair value), Available for sale on debt securities Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale Document Quarterly Report Document Quarterly Report Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Municipal bonds Municipal bonds US States and Political Subdivisions Debt Securities [Member] Proceeds from sales of available-for-sale debt securities Proceeds from Sale of Debt Securities, Available-for-Sale Other investments, cost Investment Owned, Cost Paid related to prior years Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Customers with Greater than 3% of Equity Customers with Greater than 3% of Equity [Member] Customers with Greater than 3% of Equity Cumulative convertible preferred stock, minimum liquidation preference (in USD per share) Preferred Stock, Liquidation Preference Per Share Unamortized debt issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Less: unamortized debt issuance costs Debt Issuance Costs, Net May 1, 2025 May Two Thousand Twenty Five Share Repurchase Program Two [Member] May Two Thousand Twenty Five Share Repurchase Program Two Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] 5.625% Senior Unsecured Notes Due 2026 5.625% Senior Unsecured Notes Due 2026 [Member] 5.625% Senior Unsecured Notes Due 2026 Statutory Accounting Practices [Table] Statutory Accounting Practices [Table] Equity Component [Domain] Equity Component [Domain] Deferred policy acquisition costs DPAC, beginning of period DPAC, end of period Deferred Policy Acquisition Cost PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount OPERATING COSTS AND EXPENSES Benefits, Losses and Expenses [Abstract] Paid related to: Paid Related To [Abstract] Paid Related To Fair Value Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Adoption Date Trading Arrangement Adoption Date Stated percentage (in percent) Debt Instrument, Interest Rate, Stated Percentage Total stockholders’ equity Beginning balance Ending balance Equity, Attributable to Parent Reinsurance payable, due in second year Other Commitment, to be Paid, Year Two Debt issuance cost, Write-off Deferred Debt Issuance Cost, Writeoff Equity securities, at fair value (cost: $113,037 and $87,326) Equity Securities: Equity Securities, FV-NI, Current ASSETS Assets [Abstract] Schedule of Realized and Unrealized Gain (Loss) on Investments Realized and Unrealized Gain (Loss) on Investments [Table Text Block] Realized and Unrealized Gain (Loss) on Investments Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Accounting Policies [Abstract] Accounting Policies [Abstract] Direct premiums written Direct Premiums Written Available for sale debt securities, amortized cost Amortized Cost Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Insider Trading Policies and Procedures [Line Items] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Performance Share Units Performance Shares [Member] Proceeds from sales and maturities (fair value), other investments Proceeds from Sale and Maturity of Other Investments APPCIC American Platinum Property And Casualty Insurance Company [Member] American platinum property and casualty insurance company. Paid related to current year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Total incurred Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Repayment of debt Repayments of Debt COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] A A Comparable Rating [Member] A comparable rating. 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DaVinci Reinsurance Ltd. [Member] DaVinci Reinsurance Ltd. Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] SUBSEQUENT EVENTS Subsequent Events [Text Block] Jurisdiction [Axis] Statutory Accounting Practice, Jurisdiction [Axis] Dividend received deduction Effective Income Tax Rate Reconciliation, Deduction, Dividend, Percent Name Forgone Recovery, Individual Name Net realized gains (losses) on investments Net realized gains (losses) on investments Debt and Equity Securities, Realized Gain (Loss) Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Proceeds from sale of private equity limited partnership Proceeds from Sale of Other Investments Statement [Line Items] Statement [Line Items] Total assets Assets Private Equity Funds Private Equity Funds [Member] Cumulative convertible preferred stock, shares issued (in shares) Preferred Shares Issued, beginning balance (in shares) Preferred Shares Issued, ending balance (in shares) Preferred Stock, Shares Issued Pre-tax Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent [Abstract] Investment income Interest and Dividend Income, Operating No Rating Available Not Rated [Member] Not rated. Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Unrealized holding gains (losses) arising during the period OCI, before Reclassifications, Net of Tax, Attributable to Parent PEO PEO [Member] Ceded Credit Risk, Reinsurer [Domain] Reinsurer, Name [Domain] Gross realized losses on sale of securities, Equity securities Equity Securities, FV-NI, Realized Loss Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount January 7, 2026 January Two Thousand Twenty Six Share Repurchase Program [Member] January Two Thousand Twenty Six Share Repurchase Program Stock option exercises (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Total invested assets Investments Due in one year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Subsequent Event Type [Domain] Subsequent Event Type [Domain] Retained Earnings Retained Earnings [Member] Revolving Credit Facility Revolving Credit Facility [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Schedule of Carrying Value and Estimated Fair Values of Financial Instruments not Carried at Fair Value Fair Value, by Balance Sheet Grouping [Table Text Block] Debt issuance costs paid Payments of Debt Issuance Costs Corporate bonds Corporate bonds Corporate Debt Securities [Member] Diluted earnings (loss) per common share (in USD per share) Earnings Per Share, Diluted Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Current Reporting Status Entity Current Reporting Status Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Stock option exercises Stock Issued During Period, Value, Stock Options Exercised And Treasury Stock Retired Stock Issued During Period, Value, Stock Options Exercised And Treasury Stock Retired Total Shareholder Return Amount Total Shareholder Return Amount Unrealized gains (losses) recognized during the reported period on equity securities still held at the end of the reported period Total unrealized gains (losses) recognized during the reported period on investments in private equity limited partnerships still held at the end of the reported period Unrealized Gain (Loss) on Investments Ceded Credit Risk, Reinsurer [Axis] Reinsurer, Name [Axis] Ceded Credit Risk [Line Items] Ceded Credit Risk [Line Items] Net premiums written Premiums Written, Net Assumed conversion of preferred stock (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock Less: Reclassification adjustments for (gains) losses realized in net income (loss) Reclassification from AOCI, Current Period, Tax Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Property and equipment, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Commitment fee percentage (in percent) Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Net Investment Income [Line Items] Net Investment Income [Line Items] Financial Instruments [Domain] Financial Instruments [Domain] Tax Other Comprehensive Income (Loss), Tax [Abstract] Prepaid reinsurance premiums Prepaid Reinsurance Premiums Mortgage-backed and asset-backed securities Mortgage-backed and asset-backed securities Mortgage Backed And Asset Backed Securities [Member] Securities that are primarily serviced by the cash flows of a discrete pool of receivables or other financial assets for example, but not limited to, mortgage loans, credit card receivables, car loans, recreational vehicle loans, and mobile home loans. 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[Member] Schedule of Changes in Liability for Unpaid Losses and LAE Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Credit card receivables Collateralized Credit Card Securities [Member] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Cash dividend declared per preferred share (in USD per share) Preferred Stock, Dividends Per Share, Declared Common stock, shares issued (in shares) Common Shares Issued, beginning balance (in shares) Common Shares Issued, ending balance (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Schedule of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Treasury stock, shares (in shares) Treasury Shares, beginning balance (in shares) Treasury Shares, ending balance (in shares) Treasury Stock, Common, Shares Premiums earned, net Premiums Earned, Net Available-for-sale securities, allowance for credit loss Allowance for Expected Credit Losses Expected credit loss on available-for-sale debt securities at beginning of period Expected credit loss on available-for-sale debt securities at end of period Debt Securities, Available-for-Sale, Allowance for Credit Loss Proceeds from sale of property and equipment Proceeds from Sale of Other Property, Plant, and Equipment 12 months or longer, Unrealized losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss OTHER COMPREHENSIVE INCOME (LOSS) Comprehensive Income (Loss) Note [Text Block] Change in unearned premiums (Increase) Decrease in Unearned Premiums, Net Equity Components [Axis] Equity Components [Axis] Other operating costs and expenses Other Cost and Expense, Operating March 11, 2024 March Two Thousand Twenty Four Share Repurchase Program [Member] March Two Thousand Twenty Four Share Repurchase Program Entity Interactive Data Current Entity Interactive Data Current Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Due after one year through five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Entity Small Business Entity Small Business Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Unearned premiums Unearned Premiums Termination Date Trading Arrangement Termination Date Gross realized gains on sale of securities, Equity securities Equity Securities, FV-NI, Realized Gain Statutory Accounting Practices [Line Items] Statutory Accounting Practices [Line Items] Subsequent Events [Abstract] Subsequent Events [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Expected provision at federal statutory tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Schedule of Fair Value of the Other Investments Reported at Net Asset Value Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Incurred related to current year Current Year Claims and Claims Adjustment Expense Document Type Document Type Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value as of Grant Date Award Grant Date Fair Value Schedule of Fair Value and Gross Unrealized Losses on Securities Available for Sale Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Cash and cash equivalents Cash and Cash Equivalents [Member] Arrangement Duration Trading Arrangement Duration Subsequent Event [Line Items] Subsequent Event [Line Items] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Less than 12 months, Unrealized losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Other comprehensive income (loss) Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent INCOME (LOSS) BEFORE INCOME TAXES Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] UPCIC Universal Property And Casualty Insurance Company [Member] Universal property and casualty insurance company. Commitments and Contingencies (Note 12) Commitments and Contingencies Total revenues Revenues Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Equity compensation shortfall (excess) Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Percent Fair Value (a) Investment in Private Equity Limited Partnership Alternative Investment Gain (Loss) on Securities [Line Items] Gain (Loss) on Securities [Line Items] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] REINSURANCE Reinsurance [Text Block] Award Type [Domain] Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Increases (decrease) resulting from: Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent [Abstract] FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] Level 3 Fair Value, Inputs, Level 3 [Member] Schedule of Depreciation Expense Related to Investment Real Estate Depreciation Expense Related To Investment Real Estate [Table Text Block] Depreciation Expense Related To Investment Real Estate [Table Text Block] Purchases of treasury stock (in shares) Total Number of Shares Repurchased During the Year (in shares) Treasury Stock, Shares, Acquired PEO Name PEO Name Total paid Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Geographical [Axis] Geographical [Axis] Fair Value (a) Fair Value Measured at Net Asset Value Per Share Fair Value Measured at Net Asset Value Per Share [Member] Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] Reinsurance unsecured amounts due from reinsurers Reinsurance Unsecured Amounts Due From Reinsurers Represents total unsecured net amounts due from reinsurers whose aggregate balance exceeded 3% of stockholders' equity as of the reporting date. Other assets Other Assets Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Total Interest Expense, Debt Provision for (or reversal of) credit loss expense Debt Securities, Available-for-Sale, Allowance for Credit Loss, Period Increase (Decrease) Mutual funds Mutual Fund [Member] Liability Class [Axis] Liability Class [Axis] Purchases of treasury stock Aggregate Purchase Price (in USD per share) Treasury Stock, Value, Acquired, Cost Method Less: Preferred stock dividends Preferred Stock Dividends, Income Statement Impact Balance, beginning of period Balance, end of period Total cash and cash equivalents and restricted cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Direct losses and loss adjustment expenses Policyholder Benefits and Claims Incurred, Direct UPCIC and APPCIC American Platinum Property And Casualty Insurance Company And Universal Property And Casualty Insurance Company [Member] American platinum property and casualty insurance company and universal property and casualty insurance company. Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code 2026 Revolving Loan Credit Facility 2026 Revolving Loan Credit Facility [Member] 2026 Revolving Loan Credit Facility Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table] Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] NATURE OF OPERATIONS AND BASIS OF PRESENTATION Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Debt Instrument [Axis] Debt Instrument [Axis] Subsequent Event [Table] Subsequent Event [Table] Declaration of dividends Dividends, Cash Stockholders' Equity, Total Stockholders' Equity, Total [Member] Georgia GEORGIA Customer [Domain] Customer [Domain] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Due after five years through ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Basic earnings (loss) per common share (in USD per share) Earnings Per Share, Basic Purchases of treasury stock inclusive of excise taxes paid Payments for Repurchase of Common Stock Mortgage-backed securities: Collateralized Mortgage-Backed Securities [Member] Statistical Measurement Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Schedule of Shares Repurchased Class of Treasury Stock [Table Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Florida FLORIDA Amortization of DPAC Deferred Policy Acquisition Costs, Amortization Expense Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Shares Issued Common Stock [Member] Available-for-sale debt securities, at fair value, net of allowance for credit loss of $881 and $631 (amortized cost: $1,553,900 and $1,466,145) Fair Value Fair Value Debt Securities, Available-for-Sale External Credit Rating by Grouping [Axis] External Credit Rating by Grouping [Axis] Schedule of Amortized Cost and Fair Value on Mortgage-Backed and Asset-Backed Securities Amortized Cost And Estimated Fair Value Mortgage Backed And Asset Backed Securities [Table Text Block] Tabular disclosure of the cost basis and fair value of mortgage-backed and asset-backed securities. Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Nondeductible expenses Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover page. Cover [Abstract] Insurance [Abstract] Insurance [Abstract] BBB B B B Comparable Rating [Member] BBB comparable rating. Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Interest Expense: Interest Expense, Debt, Excluding Amortization Unsecured amounts due from reinsurers exceeding a fixed percentage of stockholders equity Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Reinsurance Retention Policy [Table] Reinsurance Retention [Table] Equity Awards Adjustments Equity Awards Adjustments [Member] Florida Hurricane Catastrophe Fund “FHCF” Florida Hurricane Catastrophe Fund [Member] Florida hurricane catastrophe fund. Total liabilities and stockholders’ equity Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Ceded Credit Risk [Table] Ceded Credit Risk [Table] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Asset Class [Axis] Asset Class [Axis] Underlying Asset Class [Domain] Underlying Asset Class [Domain] Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Reinsurance recoverable on unpaid losses and LAE Less: Reinsurance recoverables Plus: Reinsurance recoverables Reinsurance Recoverable for Unpaid Claims and Claims Adjustments Schedule of Details on Unrealized Gains and Losses Related to Equity Securities Unrealized Gain (Loss) on Investments [Table Text Block] LIABILITY FOR UNPAID LOSSES AND LOSS ADJUSTMENT EXPENSES Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block] DEBT Long-Term Debt [Text Block] Liquidation period Alternative Investment, Liquidation Period Alternative Investment, Liquidation Period Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Ceded premiums written Ceded Premiums Written Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Schedule of Securities Available for Sale Schedule of Realized Gain (Loss) [Table Text Block] Cumulative convertible preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Cumulative convertible preferred stock Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Markel Bermuda Ltd. Markel Bermuda Ltd. [Member] Markel Bermuda Ltd. Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total assets accounted for at fair value Assets, Fair Value Disclosure Name Measure Name Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] INCOME TAXES Income Tax Disclosure [Text Block] Equity [Line Items] Equity [Line Items] Equity. Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Proceeds from sales of equity securities Proceeds from sales and maturities (fair value), Equity securities Proceeds from Sale of Equity Securities, FV-NI Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Debt Securities, Available-for-sale, Allowance for Credit Loss [Table] Debt Securities, Available-for-Sale, Allowance for Credit Loss [Table] Decrease in liability for claims and claims adjustment expense reserve Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve Additional Paid-In Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category AA A A Comparable Rating [Member] AA comparable rating. Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Policy acquisition costs Policy Acquisition Costs Policy Acquisition Costs Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Retirement of treasury shares Treasury Stock, Retired, Cost Method, Amount Company Selected Measure Amount Company Selected Measure Amount Schedule of Statutory Capital and Surplus, and an Amount Representing Ten Percent of Total Liabilities for both UPCIC and APPCIC Statutory Accounting Practices Disclosure [Table Text Block] Net change in unrealized gains (losses) on investments Equity Securities, FV-NI, Unrealized Gain (Loss) Income taxes recoverable Income Taxes Receivable Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Reinsurance payable, due in first year Other Commitment, to be Paid, Year One Total investment income Gross Investment Income, Operating Auto loan receivables Collateralized Auto Loans [Member] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Total operating costs and expenses Benefits, Losses and Expenses Income tax expense (benefit) Income tax expense (benefit) Income Tax Expense (Benefit) Statutory capital and surplus Statutory Accounting Practices, Statutory Capital and Surplus, Balance Assets held by insurance regulators Assets Held by Insurance Regulators Award Timing Method Award Timing Method [Text Block] Net increase (decrease) during the period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Numerator for EPS: Net Income (Loss) Attributable to Parent [Abstract] Premiums receivable, net Premiums Receivable, Net Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Interest and amortization of debt issuance costs Interest and Amortization of Debt Issuance Costs Interest and Amortization of Debt Issuance Costs NET INCOME (LOSS) Net income (loss) Net income (loss) Net Income (Loss) Attributable to Parent Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Investments Investments [Member] Statement [Table] Statement [Table] Catastrophic Event [Axis] Catastrophic Event [Axis] Restatement Determination Date: Restatement Determination Date [Axis] Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Grant of restricted stock awards Stock Issued During Period, Value, Restricted Stock Award, Gross Schedule of Credit Quality of Investment Securities Fixed Maturities Credit Quality Indicators [Table Text Block] Tabular disclosure of the credit quality of fixed maturities securities. Income taxes payable Accrued Income Taxes REVENUES Revenues [Abstract] Retirement of treasury shares (in shares) Treasury Stock, Shares, Retired Debt term (in years) Long-Term Debt, Term Hawaii HAWAII Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Reinsurance Retention Policy [Line Items] Reinsurance Retention [Line Items]