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v3.25.2

Information About Segments of Business Textuals (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 segment | Jun. 30, 2025 segment
Segment Reporting Information |  |
Number of major segments | 2 | 2
Commercial auto net premiums earned, percentage | 41.70% |
Commercial Automobile |  |
Segment Reporting Information |  |
Commercial auto net premiums earned, percentage |  | 41.80%

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- Definition Commercial auto net premiums earned, percentage + References No definition available. + Details
Name: | ori_CommercialAutoNetPremiumsEarnedPercentage
Namespace Prefix: | ori_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of regulated insurance company subsidiaries organized into major segments, namely its General Insurance (property and liability insurance), Mortgage Guaranty and Title Insurance Groups. + References No definition available. + Details
Name: | ori_NumberOfMajorSegments
Namespace Prefix: | ori_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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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
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ProductOrServiceAxis=ori_CommercialAutomobileMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |