Information About Segments of Business Textuals (Details)	Jun. 30, 2012
Information About Segments of Business [Abstract]
Number of major segments	3

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.

No definition available.

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