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RESERVE FOR CLAIMS AND CLAIM EXPENSES - Schedule of Reserve for Claims and Claim Expenses by Segment (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024
--- | --- | --- | ---
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Case Reserves | $ 5,139,012 | $ 4,926,309 |
ACR | 2,124,478 | 2,200,627 |
IBNR | 15,593,641 | 14,176,555 |
Total | 22,857,131 | 21,303,491 | $ 20,369,610
Property | Operating Segments |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Case Reserves | 1,991,539 | 1,845,228 |
ACR | 1,841,944 | 1,905,553 |
IBNR | 3,703,176 | 2,821,958 |
Total | 7,536,659 | 6,572,739 |
Casualty and Specialty | Operating Segments |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Case Reserves | 3,147,473 | 3,081,081 |
ACR | 282,534 | 295,074 |
IBNR | 11,890,465 | 11,354,597 |
Total | $ 15,320,472 | $ 14,730,752 |

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-7 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9E Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (cc) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(13)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Estimated costs as of the balance sheet date of settling insured claims and costs incurred in the claims settlement process for claims that have not yet been submitted to the insurance company for reimbursement. + References No definition available. + Details
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- Definition Costs of settling insured claims and costs incurred in the claims settlement process for the specified year specifically for claims that have already been submitted to the insurance company for reimbursement. + References No definition available. + Details
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