Name:	ori_AvailableForSaleAndHeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
Namespace Prefix:	ori_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Interest expense incurred on funds held for clients

No definition available.

Name:	ori_Interestexpenseincurredonfundsheld
Namespace Prefix:	ori_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Disclosure regarding factors used to determine that the impairment of securities not categorized as either held-to-maturity securities or trading securities (hence equal to available for sale securities) where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the available-for-sale investments that have been in a continuous unrealized loss position for more than 12 months.

No definition available.

Name:	ori_NumberOfSecuritiesInContinuousUnrealizedLossPositionForMoreThan12Months
Namespace Prefix:	ori_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

The minimum percentage decline in an equity security used in the determination of other-than-temporary impairment.

No definition available.

Name:	ori_OtherThanTemporaryImpairmentsMinimumPercentageDecline
Namespace Prefix:	ori_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Disclosure regarding factors used to determine that the impairment of securities not categorized as either held-to-maturity securities or trading securities (hence equal to available for sale securities) where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the percentage of the total securities in an unrealized loss position.

No definition available.

Name:	ori_PercentageOfSecuritiesInUnrealizedLossPosition
Namespace Prefix:	ori_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The net realized gains or losses on impairments of investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

No definition available.

Name:	ori_RealizedInvestmentGainsLossesFromImpairment
Namespace Prefix:	ori_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

Name:	us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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.

No definition available.